Architects' PI Insurance at Renewal | Specialist UK Broker
Why has UK architects PI renewal become a strategic event in 2026?
For most of the 2000s and 2010s, architects' professional indemnity renewal was a transactional event — a proposal form completed in an afternoon, a couple of competitive quotations, terms accepted, certificate filed with the Architects Registration Board, and the practice moved on. That settlement is long gone. By 2026, architects' PI renewal has become one of the most consequential annual events in practice management — affecting which projects can be accepted, which contracts can be signed, which historic exposures remain insured, and in some cases whether the practice can continue to trade at all.
The trigger isn't one factor but a confluence. The Building Safety Act 2022 extended the Defective Premises Act limitation period to 30 years retrospectively for claims accruing before 28 June 2022 — meaning architectural work signed off in the mid-1990s can still generate compensable claims today. The new ARB Code of Conduct, effective 1 September 2025, restated minimum PI requirements and introduced new accountability around competence, principal designer duties, and complaint handling. Building Liability Orders allow courts to "pierce the corporate veil" and hold associated companies responsible for another company's defects. And in March 2026, the Wren Insurance Association — the architects' mutual that had remained one of the last meaningful providers of cladding cover — confirmed it will not offer renewal terms from 1 July 2026, removing one of the last sources of cladding capacity from a market that was already constrained.
Add to this the standard mechanics of PI insurance — claims-made policies with retroactive dates, the legal duty of fair presentation under the Insurance Act 2015, run-off cover obligations on cessation, and aggregation rules that vary materially between policies — and the consequence is clear: PI renewal can no longer be approached as a procurement event. It is a regulatory, operational, contractual, and strategic event simultaneously. Architects who treat it transactionally now face material exposure to uninsured claims, breach of ARB Code, breach of contract with clients requiring higher cover, and personal liability where corporate cover fails.
This guide is the definitive 2026 architects PI renewal article — built around the regulatory transformation that's reshaped the market, the actual claim exposures that drive renewal terms, the documentation and disclosure discipline that wins favourable terms, and the cover architecture that responds when claims arise. It complements our main professional indemnity insurance product page and sits alongside our broader PI cluster including the professional indemnity broker guide and the business indemnity insurance overview. For broader construction-side exposure see our complex construction insurance guide and the construction insurance claims examples piece.
Key facts at a glance
- The new ARB Code took effect 1 September 2025 — restating the PII baseline that no architect should accept work without at least £250,000 each-and-every-claim cover, and reaffirming that an increase in premium is not a valid reason for non-renewal under the Code.
- The Building Safety Act 2022 extended the Defective Premises Act limitation to 30 years retrospectively for claims accruing before 28 June 2022 — meaning architectural work from the mid-1990s is still actionable today and PI claims-made cover at the date of notification is the policy that responds.
- Wren Insurance Association is winding down from 1 July 2026 — removing one of the last UK insurers willing to provide meaningful cladding cover for architects, materially tightening capacity in the cladding/fire safety segment of the market.
- Cladding and fire safety cover is now routinely held on an aggregate basis with direct-loss-only limitation — the ARB has formally accepted this since 2022 and the 2025 Code restated the position, but the underlying exposure to consequential losses now sits with the architect.
- Building Liability Orders introduced by the Building Safety Act 2022 allow courts to hold associated companies responsible for another company's building safety liabilities — piercing the corporate veil in ways traditional PI cover structures did not contemplate.
- The Insurance Act 2015 duty of fair presentation requires architects to proactively disclose every material fact at renewal — non-disclosure remains the single most common cause of UK PI claim avoidance or reduction.
- Architects PI premiums in 2026 typically run £750–£4,500 for sole practitioners, £4,000–£18,000 for small practices (3-8 staff), and £15,000–£75,000+ for mid-sized practices with higher-risk project exposure including high-rise residential and cladding work.
1. The 8 biggest architects PI renewal risks: summary table
The eight risks below are ranked by combined frequency, severity, and 2026 regulatory consequence. Some — cladding aggregation, non-disclosure — are everyday renewal realities. Others — Building Liability Orders, principal designer duties — are still emerging in case law but already shaping insurer appetite. A competent renewal addresses all eight in parallel rather than treating them as separable items.
| Risk | Frequency | Severity | Primary Cover Response |
|---|---|---|---|
| Cladding and fire safety aggregation | Common — almost all practices | High (consequential loss exclusion) | PI with aggregate scope, broker-negotiated wording |
| Insurance Act 2015 non-disclosure | Most common claim avoidance cause | Catastrophic (claim avoidance) | Disciplined renewal disclosure protocol |
| Retroactive date / continuity gaps | Common — broker change, market exit | High (entire historic book uninsured) | PI with full retroactive cover, continuity discipline |
| Claims-made trap and notification timing | Routine | High (notification failure voids cover) | Notification protocol, broker engagement |
| Run-off and cessation cover | Rising — practices closing | High (30-year DPA tail) | Run-off PI, principal personal cover |
| Building Liability Orders | Emerging — case law developing | Catastrophic (corporate veil pierced) | PI with BLO scope, group structure review |
| Principal Designer duties (BSA) | Rising — every BSA project | High (£10k–£500k+ per claim) | PI with PD scope explicitly declared |
| Contract requirements vs ARB minimum gap | Common | Medium-High (breach of contract) | PI limit matched to actual contract specs |
2. What does the new ARB Code 2025 require for renewal?
The Architects Registration Board's new Code of Conduct, effective 1 September 2025, restated and clarified the regulatory PII baseline that has applied to UK architects since 1997. The key positions for 2026 renewal:
- Minimum £250,000 each-and-every-claim — the floor below which no architect should accept work. This is a floor, not a target. Contract requirements routinely exceed this, often by orders of magnitude.
- Civil liability basis — cover must respond to all civil liability arising from professional services, not just negligence. This is critical because Building Safety Act remedies include non-fault-based liabilities.
- Aggregate cover acceptable for cladding, fire safety, asbestos, and pollution — recognising market reality. Cover can be limited to direct losses (excluding consequential losses) where no alternative is available.
- Run-off cover on cessation — ARB recommends a minimum of 6 years; given the 30-year retrospective DPA limitation, longer is increasingly prudent.
- Premium increase is not a valid reason for non-renewal — the Code explicitly rejects this as an excuse for trading uninsured.
- Non-acceptance of new commissions where cover is inadequate — architects should not take on work that falls outside their current PI policy scope.
- Notification to ARB where elements of cover are unavailable — architects who have made reasonable efforts but cannot obtain certain cover (e.g. retrospective historic liability cover) will not face regulatory action provided they have notified ARB and acted in accordance with the Code.
3. How does the Building Safety Act 2022 change PI renewal exposure?
The Building Safety Act 2022 (BSA) is the most significant change to UK construction liability since the Defective Premises Act 1972. The provisions relevant to architects PI renewal in 2026 are:
The 30-year retrospective Defective Premises Act limitation
Section 135 of the BSA extended the limitation period under the Defective Premises Act 1972 from 6 years to 30 years retrospectively for claims accruing before 28 June 2022, and 15 years prospectively. Architectural work signed off in the mid-1990s is now actionable today — and because PI is written on a claims-made basis, the policy in force at the date of notification is the policy that must respond. This places enormous weight on continuity of cover. A practice that has held continuous PI cover for 30 years has a continuous defence chain; a practice with gaps, retroactive date limitations, or broker changes that broke continuity has chronic exposure.
Building Liability Orders (BLOs)
Section 130 of the BSA introduced Building Liability Orders, which allow the court to make an order against a "relevant body corporate" — an associated company — where that body is associated with a "relevant body" that has incurred building safety liability. The effect is that the corporate veil can be pierced and an associated company held responsible for another's liability. The case of Willmott Dixon v Prater provided early judicial guidance. For architects with group structures, parent/subsidiary arrangements, or related-party design arrangements, this is a material PI consideration that wasn't on the radar in 2022.
The widened Defective Premises Act duty after URS v BDW Trading
The Supreme Court's 2025 decision in URS Corporation Ltd v BDW Trading Ltd widened the pool of parties to whom architects, engineers, and design consultants owe duties under the Defective Premises Act. D&B contractors and all design consultants under them now owe a duty to the developer under the DPA, alongside the normal duty imposed by the construction contract. Combined with the extended 30-year limitation, this means the universe of potential claimants against an architect for historic work has materially expanded.
Principal Designer duties under the BSA
The Principal Designer role was expanded by the BSA secondary legislation that took effect 1 October 2023. Where an architect acts as Principal Designer on a higher-risk building (HRB) — typically a residential building of at least 18m or 7 storeys with at least 2 dwellings, hospitals, or care homes — they have specific duties to manage the "golden thread" of design information across the three gateways (planning, construction, occupation). Mismanagement of golden thread data, gateway documentation, or the mandatory occurrence reporting system creates new PI claim categories even without an underlying design error.
What this means at renewal
For renewal in 2026, the BSA changes manifest as: more detailed underwriting questionnaires (especially on cladding, basements, swimming pools, high-rise residential, fire safety roles); requests for project lists going back 10-15 years; supplementary questionnaires on principal designer engagements; specific exclusions or sub-limits on cladding and fire safety regardless of project history; and in some cases, refusal to quote where the practice has any HRB work in its book. Specialist broker placement is now essential rather than optional.
4. What does the Wren Insurance wind-down mean for renewal in 2026?
In March 2026, the Wren Insurance Association — a mutual founded to provide PI cover to architects, with a particular focus on practices undertaking work that mainstream insurers found difficult — confirmed that it will not offer renewal terms from 1 July 2026. The mutual will continue to manage existing claims through a solvent wind-down but will write no new business.
This matters more than a routine market exit for two reasons:
- Wren had continued to provide meaningful cladding cover while most other UK PI insurers had imposed sweeping cladding exclusions following Grenfell. Its departure removes one of the last sources of cladding capacity in the architects PI market.
- Wren's wind-down was driven by claims surge, primarily linked to pre-2019 work — meaning the very claims pattern that the Building Safety Act was designed to enable (historic claims under the extended DPA limitation) is now reshaping insurer behaviour.
For Wren members renewing 1 July 2026 onwards, the practical position is that alternative placement must be secured. For non-Wren architects, the broader market consequence is reduced cladding capacity, harder underwriting, and increased premium pressure across the segment. The market response is already visible: more rigorous supplementary questionnaires on cladding and fire safety, tighter aggregate sub-limits, and higher excesses on cladding-exposed projects.
5. Risk 1: Cladding and fire safety aggregation — the dominant exclusion battle
Cladding and Fire Safety Aggregation — The Defining Market Issue
Since 2018, virtually every UK architects PI policy has carried some form of cladding and fire safety restriction. The ARB has formally accepted since 2022 that such cover can be held on an aggregate basis and limited to direct losses (excluding consequential losses such as alternative accommodation costs, business interruption, and contents damage). For 2026 renewal, the question isn't whether the restriction applies — it almost always does — but what the precise wording is, how aggregation operates, what is excluded, and whether the cover is fit for the project profile of the practice.
Detailed project list at renewal identifying cladding-exposed projects (current and historic); evidence of fire safety competence (CDM Principal Designer training, IFE-aligned methodology where relevant); documented use of suitable fire safety consultants on higher-risk projects; net contribution clauses in client appointments where possible; clear scope-of-services documentation distinguishing architect's design role from fire safety specialist input; evidence of compliance with Approved Document B and BS 9991/BS 9999 where applicable.
PI with cladding cover on aggregate basis is the working position — typically aggregated at policy limit or a defined sub-limit (£250k–£1m aggregate is common). Specialist broker placement can negotiate wording — for example, distinguishing cladding system types (ACM/HPL high risk vs traditional brick-clad timber-frame low risk), excluding consequential losses but retaining direct loss cover, and aggregating across the policy period rather than across all historic claims. Following the Wren wind-down, cladding capacity has tightened materially in 2026; getting acceptable wording requires specialist placement and detailed risk presentation.
6. Risk 2: Fair presentation and non-disclosure at renewal
Insurance Act 2015 Fair Presentation — The Most Preventable Catastrophe
The single most common reason UK PI claims are reduced, avoided, or disputed isn't policy wording — it's non-disclosure at the renewal proposal stage. The Insurance Act 2015 requires the insured to make a "fair presentation of the risk" — proactively disclosing every material circumstance the insurer would want to know, including information known by senior management, those responsible for arranging insurance, and what a reasonable search of available information would reveal.
For architects, the classic non-disclosure patterns are: not declaring a circumstance that might give rise to a claim (a dispute, complaint, or quality issue on a project, even if no formal claim has been made); not declaring cladding or fire safety work on historic projects; not declaring change in practice structure (incorporation, merger, partner departure); not declaring overseas work; not declaring acceptance of unusual contract terms (uncapped liability, fitness-for-purpose obligations, novation arrangements); not declaring known design defects awaiting remediation.
Annual renewal protocol that includes: documented review of complaint log, claims register, and project quality issues; partner declaration of any known or suspected issues; documented "reasonable search" of project files for material circumstances; supplementary questionnaire completion with senior partner sign-off; retention of all proposal documentation as evidence; written broker confirmation of what was disclosed and what was relied on. Avoid the common trap of "we'll mention it if asked" — proactive disclosure is the legal duty, not reactive.
There is no insurance response to non-disclosure — that is the entire point. The Insurance Act 2015 allows the insurer to: avoid the policy entirely (treating it as never having existed) where non-disclosure was deliberate or reckless; apply a different premium and terms (treating the policy as if those terms had applied from inception); reduce the claim proportionally. The only mitigation is at the disclosure stage. Architects with disciplined renewal protocols have routine clean claims; architects with informal renewal processes routinely face coverage disputes at the worst possible moment.
7. The architects PI cover stack — what should renew, what to remove, what to add
For most architects, the renewal conversation is dominated by PI to the exclusion of everything else. That's a partial picture. The full insurance programme that supports a UK architectural practice in 2026 typically includes:
- Professional Indemnity — the regulatory and contractual core. Main product page here.
- Public Liability — third-party injury and property damage. Site visits, client meetings, occasional model-making.
- Employers' Liability — legally required if any staff including apprentices, part-time, and casual.
- Office Contents and Property — drawings, models, computers, archived project files. Often underinsured given replacement cost of historic project files.
- Cyber Insurance — increasingly essential. Architects hold sensitive client data, building plans, security information. Ransomware on a practice with active CAD files can shut down operations for weeks. Cyber insurance for UK businesses.
- Business Interruption — particularly important where physical model-making or specialist studio infrastructure is core to the practice.
- Directors and Officers (D&O) — material at partner/director level given BLO and BSA principal designer personal accountability.
- Legal Expenses — defence cost cover for contract disputes, regulatory engagement with ARB, and employment matters.
- Commercial Vehicle — site visit driving on business cover where applicable.
8. Architects PI renewal cover checker
Select your practice profile below to see the cover stack matched to your specific risk profile. For Miller & Partner's main professional indemnity product page see professional indemnity insurance.
Architects PI Renewal Cover Checker
Select your practice profile to see the recommended insurance programme matched to the 8 main architects PI renewal risks
Sole Practitioner Architect
- ESSENTIAL Professional Indemnity £250k–£1m each-and-every-claim (£250k ARB minimum; £500k–£1m typically required by contracts)
- ESSENTIAL PI civil liability basis with full retroactive cover from practice inception date
- ESSENTIAL Public Liability £2m–£5m for site visits and client meetings
- RECOMMENDED Cyber insurance — client data, building plans, CAD file ransomware exposure
- RECOMMENDED Office contents and computer equipment cover
- RECOMMENDED Personal Accident — primary income protection for sole practitioner
- CONSIDER Legal Expenses for contract disputes and ARB regulatory engagement
- CONSIDER Employers' Liability if any apprentice, intern, or part-time help engaged
Small Practice (2-8 staff)
- ESSENTIAL Professional Indemnity £500k–£2m each-and-every-claim with civil liability basis
- ESSENTIAL PI with full retroactive cover from practice inception
- ESSENTIAL PI with cladding/fire safety aggregate scope clearly defined
- LEGAL Employers' Liability £10m (legally required with any staff)
- ESSENTIAL Public Liability £5m for site visits and client interactions
- ESSENTIAL Office property and contents — drawings, models, computers
- ESSENTIAL Cyber insurance — client data confidentiality and CAD file protection
- RECOMMENDED Business Interruption — operational continuity
- RECOMMENDED Legal Expenses with contract dispute and ARB regulatory scope
Mid-Sized Practice (9-25 staff)
- ESSENTIAL Professional Indemnity £1m–£5m each-and-every-claim — limit matched to actual contract requirements
- ESSENTIAL Full retroactive cover from practice inception with continuity discipline
- ESSENTIAL Cladding/fire safety aggregate scope with negotiated wording — direct loss preserved
- LEGAL Employers' Liability £10m comprehensive scope
- ESSENTIAL Public Liability £5m–£10m
- ESSENTIAL Cyber insurance comprehensive — ransomware, data breach, business interruption
- ESSENTIAL Directors and Officers (D&O) — partner-level BSA exposure
- ESSENTIAL Office property and contents at full replacement value
- ESSENTIAL Business Interruption
- ESSENTIAL Legal Expenses comprehensive
High-Rise / Higher-Risk Building Practice
- CRITICAL HRB exposure materially elevates PI underwriting — specialist placement essential
- ESSENTIAL Professional Indemnity £2m–£10m+ each-and-every-claim with civil liability basis
- ESSENTIAL Cladding/fire safety cover negotiated — aggregate basis acceptable but wording matters
- ESSENTIAL Building Safety Act scope — Building Liability Orders, principal designer duties, golden thread management
- ESSENTIAL Full retroactive cover with documented continuity going back to pre-2019 work
- LEGAL Employers' Liability £10m
- ESSENTIAL Public Liability £10m
- ESSENTIAL Cyber comprehensive — HRB project data is high-value target
- ESSENTIAL D&O with BSA defence scope
- ESSENTIAL Legal Expenses with regulatory and BSA defence scope
Principal Designer-Led Practice
- CRITICAL Principal Designer duties are a distinct PI claim category — specific declaration essential
- ESSENTIAL Professional Indemnity £1m–£5m with PD scope explicitly within civil liability cover
- ESSENTIAL Cover specifically contemplating golden thread management and gateway documentation
- ESSENTIAL Mandatory occurrence reporting (MOR) scope on HRB projects
- ESSENTIAL Sub-consultant competence checking process documented (BLO mitigation)
- LEGAL Employers' Liability £10m
- ESSENTIAL Public Liability £5m–£10m
- ESSENTIAL D&O — PD competence challenges can target individuals
- ESSENTIAL Cyber for golden thread data
- ESSENTIAL Legal Expenses comprehensive
Practice in Run-Off / Cessation
- CRITICAL 30-year retrospective DPA limitation makes run-off cover a long-term commitment
- ESSENTIAL Run-off Professional Indemnity — ARB recommends 6+ years; consider 10+ given DPA
- ESSENTIAL Run-off limit matched to highest historic project value, not current activity
- ESSENTIAL Full retroactive cover preserved from practice inception
- ESSENTIAL Cladding/fire safety aggregate run-off cover where relevant
- ESSENTIAL Personal cover for principals where corporate cover ceases
- RECOMMENDED Annual review of run-off premium and continued necessity given project tail
- CONSIDER ARB notification of cessation arrangements per Code
9. Renewal preparation self-check
The 2026 architects PI market rewards preparation. Tick each renewal preparation discipline your practice has in place. The unchecked items are your priority renewal improvements.
Architects PI Renewal Preparation Self-Check
Click each renewal preparation discipline you have in place. The more ticked, the better your renewal terms in the 2026 market.
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Renewal preparation starts 90+ days before expiry — not 30 days. The 2026 market rewards early engagement with detailed presentation.
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Detailed practice profile document maintained — services offered, sectors, project size range, key staff, QA system, professional memberships
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Complete project list for past 5+ years — project value, sector, location, completion date, services provided, fire safety role if any
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Cladding and higher-risk building project register — including pre-2019 historic work where the DPA 30-year limitation now extends exposure
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Complaint and dispute register reviewed before renewal — including matters not yet formal claims; this is the core Insurance Act 2015 disclosure
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Documented quality assurance and risk management system — RIBA Plan of Work alignment, design review process, peer review protocol, change control
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Contract review and approval process — fitness for purpose obligations refused; net contribution clauses sought; limit of liability negotiated where possible
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Principal Designer engagement record — projects where the practice acts as PD, sub-consultant competence checks, golden thread arrangements
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Retroactive date continuity confirmed — practice can demonstrate continuous PI cover or full retroactive cover from inception
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Continuing professional development and training records — including fire safety training, BSA familiarisation, CDM Principal Designer training where applicable
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Contract limit-of-liability review — current PI limit matched to actual highest contract requirement, not ARB minimum
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Specialist broker engagement — broker with documented architects PI experience and Lloyd's market access, not generic commercial broker
10. Architects practice risk assessor
Two factors drive architects PI renewal risk above all others: the project mix and the renewal documentation discipline. Use the tool below for your specific risk profile.
Architects PI Renewal Risk Assessor
Select your project mix and your renewal preparation maturity to see your specific risk profile and indicative insurance position
Why has UK architects PI renewal become a strategic event in 2026?
For most of the 2000s and 2010s, architects' professional indemnity renewal was a transactional event — a proposal form completed in an afternoon, a couple of competitive quotations, terms accepted, certificate filed with the Architects Registration Board, and the practice moved on. That settlement is long gone. By 2026, architects' PI renewal has become one of the most consequential annual events in practice management — affecting which projects can be accepted, which contracts can be signed, which historic exposures remain insured, and in some cases whether the practice can continue to trade at all.
The trigger isn't one factor but a confluence. The Building Safety Act 2022 extended the Defective Premises Act limitation period to 30 years retrospectively for claims accruing before 28 June 2022 — meaning architectural work signed off in the mid-1990s can still generate compensable claims today. The new ARB Code of Conduct, effective 1 September 2025, restated minimum PI requirements and introduced new accountability around competence, principal designer duties, and complaint handling. Building Liability Orders allow courts to "pierce the corporate veil" and hold associated companies responsible for another company's defects. And in March 2026, the Wren Insurance Association — the architects' mutual that had remained one of the last meaningful providers of cladding cover — confirmed it will not offer renewal terms from 1 July 2026, removing one of the last sources of cladding capacity from a market that was already constrained.
Add to this the standard mechanics of PI insurance — claims-made policies with retroactive dates, the legal duty of fair presentation under the Insurance Act 2015, run-off cover obligations on cessation, and aggregation rules that vary materially between policies — and the consequence is clear: PI renewal can no longer be approached as a procurement event. It is a regulatory, operational, contractual, and strategic event simultaneously. Architects who treat it transactionally now face material exposure to uninsured claims, breach of ARB Code, breach of contract with clients requiring higher cover, and personal liability where corporate cover fails.
This guide is the definitive 2026 architects PI renewal article — built around the regulatory transformation that's reshaped the market, the actual claim exposures that drive renewal terms, the documentation and disclosure discipline that wins favourable terms, and the cover architecture that responds when claims arise. If you need cover now rather than renewal guidance, see our architects professional indemnity insurance page. This guide also sits alongside our professional indemnity insurance page, the professional indemnity broker guide and our PI run-off cover guide. For broader construction-side exposure see our complex construction insurance guide and the construction insurance claims examples piece.
Key facts at a glance
- The new ARB Code took effect 1 September 2025 — restating the PII baseline that no architect should accept work without at least £250,000 each-and-every-claim cover, and reaffirming that an increase in premium is not a valid reason for non-renewal under the Code.
- The Building Safety Act 2022 extended the Defective Premises Act limitation to 30 years retrospectively for claims accruing before 28 June 2022 — meaning architectural work from the mid-1990s is still actionable today and PI claims-made cover at the date of notification is the policy that responds.
- Wren Insurance Association is winding down from 1 July 2026 — removing one of the last UK insurers willing to provide meaningful cladding cover for architects, materially tightening capacity in the cladding/fire safety segment of the market.
- Cladding and fire safety cover is now routinely held on an aggregate basis with direct-loss-only limitation — the ARB has formally accepted this since 2022 and the 2025 Code restated the position, but the underlying exposure to consequential losses now sits with the architect.
- Building Liability Orders introduced by the Building Safety Act 2022 allow courts to hold associated companies responsible for another company's building safety liabilities — piercing the corporate veil in ways traditional PI cover structures did not contemplate.
- The Insurance Act 2015 duty of fair presentation requires architects to proactively disclose every material fact at renewal — non-disclosure remains one of the most common causes of UK PI claim avoidance or reduction.
- Architects PI premiums in 2026 typically run £750–£4,500 for sole practitioners, £4,000–£18,000 for small practices (3-8 staff), and £15,000–£75,000+ for mid-sized practices with higher-risk project exposure including high-rise residential and cladding work.
1. The 8 biggest architects PI renewal risks: summary table
The eight risks below are ranked by combined frequency, severity, and 2026 regulatory consequence. Some — cladding aggregation, non-disclosure — are everyday renewal realities. Others — Building Liability Orders, principal designer duties — are still emerging in case law but already shaping insurer appetite. A competent renewal addresses all eight in parallel rather than treating them as separable items.
| Risk | Frequency | Severity | Primary Cover Response |
|---|---|---|---|
| Cladding and fire safety aggregation | Common — almost all practices | High (consequential loss exclusion) | PI with aggregate scope, broker-negotiated wording |
| Insurance Act 2015 non-disclosure | Most common claim avoidance cause | Catastrophic (claim avoidance) | Disciplined renewal disclosure protocol |
| Retroactive date / continuity gaps | Common — broker change, market exit | High (entire historic book uninsured) | PI with full retroactive cover, continuity discipline |
| Claims-made trap and notification timing | Routine | High (notification failure voids cover) | Notification protocol, broker engagement |
| Run-off and cessation cover | Rising — practices closing | High (30-year DPA tail) | Run-off PI, principal personal cover |
| Building Liability Orders | Emerging — case law developing | Catastrophic (corporate veil pierced) | PI with BLO scope, group structure review |
| Principal Designer duties (BSA) | Rising — every BSA project | High (£10k–£500k+ per claim) | PI with PD scope explicitly declared |
| Contract requirements vs ARB minimum gap | Common | Medium-High (breach of contract) | PI limit matched to actual contract specs |
2. What does the new ARB Code 2025 require for renewal?
The Architects Registration Board's new Code of Conduct, effective 1 September 2025, restated and clarified the regulatory PII baseline that has applied to UK architects since 1997. The key positions for 2026 renewal:
- Minimum £250,000 each-and-every-claim — the floor below which no architect should accept work. This is a floor, not a target. Contract requirements routinely exceed this, often by orders of magnitude.
- Civil liability basis — cover must respond to all civil liability arising from professional services, not just negligence. This is critical because Building Safety Act remedies include non-fault-based liabilities.
- Aggregate cover acceptable for cladding, fire safety, asbestos, and pollution — recognising market reality. Cover can be limited to direct losses (excluding consequential losses) where no alternative is available.
- Run-off cover on cessation — ARB recommends a minimum of 6 years; given the 30-year retrospective DPA limitation, longer is increasingly prudent.
- Premium increase is not a valid reason for non-renewal — the Code explicitly rejects this as an excuse for trading uninsured.
- Non-acceptance of new commissions where cover is inadequate — architects should not take on work that falls outside their current PI policy scope.
- Notification to ARB where elements of cover are unavailable — architects who have made reasonable efforts but cannot obtain certain cover (e.g. retrospective historic liability cover) will not face regulatory action provided they have notified ARB and acted in accordance with the Code.
3. How does the Building Safety Act 2022 change PI renewal exposure?
The Building Safety Act 2022 (BSA) is the most significant change to UK construction liability since the Defective Premises Act 1972. The provisions relevant to architects PI renewal in 2026 are:
The 30-year retrospective Defective Premises Act limitation
Section 135 of the BSA extended the limitation period under the Defective Premises Act 1972 from 6 years to 30 years retrospectively for claims accruing before 28 June 2022, and 15 years prospectively. Architectural work signed off in the mid-1990s is now actionable today — and because PI is written on a claims-made basis, the policy in force at the date of notification is the policy that must respond. This places enormous weight on continuity of cover. A practice that has held continuous PI cover for 30 years has a continuous defence chain; a practice with gaps, retroactive date limitations, or broker changes that broke continuity has chronic exposure.
Building Liability Orders (BLOs)
Section 130 of the BSA introduced Building Liability Orders, which allow the court to make an order against a "relevant body corporate" — an associated company — where that body is associated with a "relevant body" that has incurred building safety liability. The effect is that the corporate veil can be pierced and an associated company held responsible for another's liability. The first Building Liability Order was made in 381 Southwark Park Road RTM Co Ltd v Click St Andrews Ltd (2024), against an associated company of the developer, which was in liquidation. For architects with group structures, parent/subsidiary arrangements, or related-party design arrangements, this is a material PI consideration that wasn't on the radar in 2022.
The widened Defective Premises Act duty after URS v BDW Trading
The Supreme Court's 2025 decision in URS Corporation Ltd v BDW Trading Ltd widened the pool of parties to whom architects, engineers, and design consultants owe duties under the Defective Premises Act. D&B contractors and all design consultants under them now owe a duty to the developer under the DPA, alongside the normal duty imposed by the construction contract. Combined with the extended 30-year limitation, this means the universe of potential claimants against an architect for historic work has materially expanded.
Principal Designer duties under the BSA
The Building Regulations etc. (Amendment) (England) Regulations 2023, in force from 1 October 2023, created a Principal Designer role under the Building Regulations, separate from the Principal Designer role under CDM 2015, which an architect may also hold. Where an architect acts as Principal Designer on a higher-risk building (HRB) — typically a residential building of at least 18m or 7 storeys with at least 2 dwellings, hospitals, or care homes — they have specific duties to manage the "golden thread" of design information across the three gateways (planning, construction, occupation). Mismanagement of golden thread data, gateway documentation, or the mandatory occurrence reporting system creates new PI claim categories even without an underlying design error.
What this means at renewal
For renewal in 2026, the BSA changes manifest as: more detailed underwriting questionnaires (especially on cladding, basements, swimming pools, high-rise residential, fire safety roles); requests for project lists going back 10-15 years; supplementary questionnaires on principal designer engagements; specific exclusions or sub-limits on cladding and fire safety regardless of project history; and in some cases, refusal to quote where the practice has any HRB work in its book. Specialist broker placement is now essential rather than optional.
4. What does the Wren Insurance wind-down mean for renewal in 2026?
In March 2026, the Wren Insurance Association — a mutual founded to provide PI cover to architects, with a particular focus on practices undertaking work that mainstream insurers found difficult — confirmed that it will not offer renewal terms from 1 July 2026. The mutual will continue to manage existing claims through a solvent wind-down but will write no new business.
This matters more than a routine market exit for two reasons:
- Wren had continued to provide meaningful cladding cover while most other UK PI insurers had imposed sweeping cladding exclusions following Grenfell. Its departure removes one of the last sources of cladding capacity in the architects PI market.
- Wren's exit followed a high volume of cladding-related claims, which led to increased member calls and member departures, leaving the mutual without the scale to continue (Wren statement, 24 March 2026). The historic claims the Building Safety Act made possible are now reshaping insurer behaviour.
For Wren members renewing 1 July 2026 onwards, the practical position is that alternative placement must be secured. For non-Wren architects, the broader market consequence is reduced cladding capacity, harder underwriting, and increased premium pressure across the segment. The market response is already visible: more rigorous supplementary questionnaires on cladding and fire safety, tighter aggregate sub-limits, and higher excesses on cladding-exposed projects.
5. Risk 1: Cladding and fire safety aggregation — the dominant exclusion battle
Cladding and Fire Safety Aggregation — The Defining Market Issue
Since 2018, virtually every UK architects PI policy has carried some form of cladding and fire safety restriction. The ARB has formally accepted since 2022 that such cover can be held on an aggregate basis and limited to direct losses (excluding consequential losses such as alternative accommodation costs, business interruption, and contents damage). For 2026 renewal, the question isn't whether the restriction applies — it almost always does — but what the precise wording is, how aggregation operates, what is excluded, and whether the cover is fit for the project profile of the practice.
Detailed project list at renewal identifying cladding-exposed projects (current and historic); evidence of fire safety competence (CDM Principal Designer training, IFE-aligned methodology where relevant); documented use of suitable fire safety consultants on higher-risk projects; net contribution clauses in client appointments where possible; clear scope-of-services documentation distinguishing architect's design role from fire safety specialist input; evidence of compliance with Approved Document B and BS 9991/BS 9999 where applicable.
PI with cladding cover on aggregate basis is the working position — typically aggregated at policy limit or a defined sub-limit (£250k–£1m aggregate is common). Specialist broker placement can negotiate wording — for example, distinguishing cladding system types (ACM/HPL high risk vs traditional brick-clad timber-frame low risk), excluding consequential losses but retaining direct loss cover, and aggregating across the policy period rather than across all historic claims. Following the Wren wind-down, cladding capacity has tightened materially in 2026; getting acceptable wording requires specialist placement and detailed risk presentation.
6. Risk 2: Fair presentation and non-disclosure at renewal
Insurance Act 2015 Fair Presentation — The Most Preventable Catastrophe
The single most common reason UK PI claims are reduced, avoided, or disputed isn't policy wording — it's non-disclosure at the renewal proposal stage. The Insurance Act 2015 requires the insured to make a "fair presentation of the risk" — proactively disclosing every material circumstance the insurer would want to know, including information known by senior management, those responsible for arranging insurance, and what a reasonable search of available information would reveal.
For architects, the classic non-disclosure patterns are: not declaring a circumstance that might give rise to a claim (a dispute, complaint, or quality issue on a project, even if no formal claim has been made); not declaring cladding or fire safety work on historic projects; not declaring change in practice structure (incorporation, merger, partner departure); not declaring overseas work; not declaring acceptance of unusual contract terms (uncapped liability, fitness-for-purpose obligations, novation arrangements); not declaring known design defects awaiting remediation.
Annual renewal protocol that includes: documented review of complaint log, claims register, and project quality issues; partner declaration of any known or suspected issues; documented "reasonable search" of project files for material circumstances; supplementary questionnaire completion with senior partner sign-off; retention of all proposal documentation as evidence; written broker confirmation of what was disclosed and what was relied on. Avoid the common trap of "we'll mention it if asked" — proactive disclosure is the legal duty, not reactive.
There is no insurance response to non-disclosure — that is the entire point. The Insurance Act 2015 allows the insurer to: avoid the policy entirely (treating it as never having existed) where non-disclosure was deliberate or reckless; apply a different premium and terms (treating the policy as if those terms had applied from inception); reduce the claim proportionally. The only mitigation is at the disclosure stage. Architects with disciplined renewal protocols have routine clean claims; architects with informal renewal processes routinely face coverage disputes at the worst possible moment.
7. The architects PI cover stack — what should renew, what to remove, what to add
For most architects, the renewal conversation is dominated by PI to the exclusion of everything else. That's a partial picture. The full insurance programme that supports a UK architectural practice in 2026 typically includes:
- Professional Indemnity — the regulatory and contractual core. See our architects PI insurance page.
- Public Liability — third-party injury and property damage. Site visits, client meetings, occasional model-making.
- Employers' Liability — legally required if any staff including apprentices, part-time, and casual.
- Office Contents and Property — drawings, models, computers, archived project files. Often underinsured given replacement cost of historic project files.
- Cyber Insurance — increasingly essential. Architects hold sensitive client data, building plans, security information. Ransomware on a practice with active CAD files can shut down operations for weeks. Cyber insurance for UK businesses.
- Business Interruption — particularly important where physical model-making or specialist studio infrastructure is core to the practice.
- Directors and Officers (D&O) — material at partner/director level given BLO and BSA principal designer personal accountability.
- Legal Expenses — defence cost cover for contract disputes, regulatory engagement with ARB, and employment matters.
- Commercial Vehicle — site visit driving on business cover where applicable.
8. Architects PI renewal cover checker
Select your practice profile below to see the cover stack matched to your specific risk profile. For Miller & Partner's main professional indemnity product page see professional indemnity insurance.
Architects PI Renewal Cover Checker
Select your practice profile to see the recommended insurance programme matched to the 8 main architects PI renewal risks
Sole Practitioner Architect
- ESSENTIAL Professional Indemnity £250k–£1m each-and-every-claim (£250k ARB minimum; £500k–£1m typically required by contracts)
- ESSENTIAL PI civil liability basis with full retroactive cover from practice inception date
- ESSENTIAL Public Liability £2m–£5m for site visits and client meetings
- RECOMMENDED Cyber insurance — client data, building plans, CAD file ransomware exposure
- RECOMMENDED Office contents and computer equipment cover
- RECOMMENDED Personal Accident — primary income protection for sole practitioner
- CONSIDER Legal Expenses for contract disputes and ARB regulatory engagement
- CONSIDER Employers' Liability if any apprentice, intern, or part-time help engaged
Small Practice (2-8 staff)
- ESSENTIAL Professional Indemnity £500k–£2m each-and-every-claim with civil liability basis
- ESSENTIAL PI with full retroactive cover from practice inception
- ESSENTIAL PI with cladding/fire safety aggregate scope clearly defined
- LEGAL Employers' Liability (legally required with any staff; £5m legal minimum, £10m standard)
- ESSENTIAL Public Liability £5m for site visits and client interactions
- ESSENTIAL Office property and contents — drawings, models, computers
- ESSENTIAL Cyber insurance — client data confidentiality and CAD file protection
- RECOMMENDED Business Interruption — operational continuity
- RECOMMENDED Legal Expenses with contract dispute and ARB regulatory scope
Mid-Sized Practice (9-25 staff)
- ESSENTIAL Professional Indemnity £1m–£5m each-and-every-claim — limit matched to actual contract requirements
- ESSENTIAL Full retroactive cover from practice inception with continuity discipline
- ESSENTIAL Cladding/fire safety aggregate scope with negotiated wording — direct loss preserved
- LEGAL Employers' Liability (£5m legal minimum, £10m standard)
- ESSENTIAL Public Liability £5m–£10m
- ESSENTIAL Cyber insurance comprehensive — ransomware, data breach, business interruption
- ESSENTIAL Directors and Officers (D&O) — partner-level BSA exposure
- ESSENTIAL Office property and contents at full replacement value
- ESSENTIAL Business Interruption
- ESSENTIAL Legal Expenses comprehensive
High-Rise / Higher-Risk Building Practice
- CRITICAL HRB exposure materially elevates PI underwriting — specialist placement essential
- ESSENTIAL Professional Indemnity £2m–£10m+ each-and-every-claim with civil liability basis
- ESSENTIAL Cladding/fire safety cover negotiated — aggregate basis acceptable but wording matters
- ESSENTIAL Building Safety Act scope — Building Liability Orders, principal designer duties, golden thread management
- ESSENTIAL Full retroactive cover with documented continuity going back to pre-2019 work
- LEGAL Employers' Liability (£5m legal minimum, £10m standard)
- ESSENTIAL Public Liability £10m
- ESSENTIAL Cyber comprehensive — HRB project data is high-value target
- ESSENTIAL D&O with BSA defence scope
- ESSENTIAL Legal Expenses with regulatory and BSA defence scope
Principal Designer-Led Practice
- CRITICAL Principal Designer duties are a distinct PI claim category — specific declaration essential
- ESSENTIAL Professional Indemnity £1m–£5m with PD scope explicitly within civil liability cover
- ESSENTIAL Cover specifically contemplating golden thread management and gateway documentation
- ESSENTIAL Mandatory occurrence reporting (MOR) scope on HRB projects
- ESSENTIAL Sub-consultant competence checking process documented (BLO mitigation)
- LEGAL Employers' Liability (£5m legal minimum, £10m standard)
- ESSENTIAL Public Liability £5m–£10m
- ESSENTIAL D&O — PD competence challenges can target individuals
- ESSENTIAL Cyber for golden thread data
- ESSENTIAL Legal Expenses comprehensive
Practice in Run-Off / Cessation
- CRITICAL 30-year retrospective DPA limitation makes run-off cover a long-term commitment
- ESSENTIAL Run-off Professional Indemnity — ARB recommends 6+ years; consider 10+ given DPA
- ESSENTIAL Run-off limit matched to highest historic project value, not current activity
- ESSENTIAL Full retroactive cover preserved from practice inception
- ESSENTIAL Cladding/fire safety aggregate run-off cover where relevant
- ESSENTIAL Personal cover for principals where corporate cover ceases
- RECOMMENDED Annual review of run-off premium and continued necessity given project tail
- CONSIDER ARB notification of cessation arrangements per Code
9. Renewal preparation self-check
The 2026 architects PI market rewards preparation. Tick each renewal preparation discipline your practice has in place. The unchecked items are your priority renewal improvements.
Architects PI Renewal Preparation Self-Check
Click each renewal preparation discipline you have in place. The more ticked, the better your renewal terms in the 2026 market.
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Renewal preparation starts 90+ days before expiry — not 30 days. The 2026 market rewards early engagement with detailed presentation.
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Detailed practice profile document maintained — services offered, sectors, project size range, key staff, QA system, professional memberships
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Complete project list for past 5+ years — project value, sector, location, completion date, services provided, fire safety role if any
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Cladding and higher-risk building project register — including pre-2019 historic work where the DPA 30-year limitation now extends exposure
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Complaint and dispute register reviewed before renewal — including matters not yet formal claims; this is the core Insurance Act 2015 disclosure
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Documented quality assurance and risk management system — RIBA Plan of Work alignment, design review process, peer review protocol, change control
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Contract review and approval process — fitness for purpose obligations refused; net contribution clauses sought; limit of liability negotiated where possible
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Principal Designer engagement record — projects where the practice acts as PD, sub-consultant competence checks, golden thread arrangements
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Retroactive date continuity confirmed — practice can demonstrate continuous PI cover or full retroactive cover from inception
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Continuing professional development and training records — including fire safety training, BSA familiarisation, CDM Principal Designer training where applicable
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Contract limit-of-liability review — current PI limit matched to actual highest contract requirement, not ARB minimum
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Specialist broker engagement — broker with documented architects PI experience and Lloyd's market access, not generic commercial broker
10. Architects practice risk assessor
Two factors drive architects PI renewal risk above all others: the project mix and the renewal documentation discipline. Use the tool below for your specific risk profile.
Architects PI Renewal Risk Assessor
Select your project mix and your renewal preparation maturity to see your specific risk profile and indicative insurance position
11. Risk 3: Retroactive date and continuity gaps
Retroactive Date and Continuity — The Hidden Historic Exposure
Architects PI is written on a claims-made basis with a retroactive date — meaning the policy responds to claims notified during the current policy period for work performed on or after the retroactive date. If the retroactive date is set to "inception of practice", the historic book is covered. If the retroactive date is set to a later date (a common consequence of broker change, market exit, or insurer restructure), all work performed before that date is uninsured — regardless of how many years of premium have been paid since.
The 2026 dimension is that the Defective Premises Act 1972 limitation period now extends to 30 years retrospectively for claims accruing before 28 June 2022. A practice that has unwittingly accepted a retroactive date moved forward at some point in its history may now face DPA claims on pre-retroactive-date work with no cover response. This is the single largest hidden exposure in the architects PI market in 2026.
Confirm retroactive date on every policy renewal and at every broker engagement; request written confirmation from broker that retroactive date is "inception of practice" or specific calendar date matching practice formation; preserve all prior policy schedules as continuity evidence; review broker change carefully — moving broker can result in unwitting retroactive date change; on incorporation of an unincorporated practice or business sale, manage retroactive date carefully to avoid cover gap.
Negotiation of "full retroactive cover" at placement, with documented inception date matching practice formation. Where retroactive date has moved forward in the past, consider remedial action: standalone retroactive PI cover where available, run-off cover on the prior policy where the prior insurer offered it, or in some cases standalone "step-up" cover. The cost of fixing this at placement is modest; the cost of discovering it at claim stage is potentially every uninsured DPA claim on pre-retroactive-date work for the next 30 years.
12. Risk 4: Claims-made trap and notification timing
Claims-Made Notification — The Procedural Cover Killer
PI policies require notification of claims and circumstances likely to give rise to claims within specific timeframes — typically "as soon as reasonably practicable" but sometimes specified as a number of days. Late notification can result in claim denial regardless of the merits of the underlying claim. The classic patterns: complaint received but treated as a quality issue rather than a potential claim; design dispute discussed informally with client but not notified; sub-consultant issue affecting completed work not flagged at the time it emerged; staff departure without claim status review of their projects.
The Building Safety Act has made this worse. Mandatory Occurrence Reporting requirements on HRB projects create a class of regulatory notifications that may or may not also constitute PI policy notifications depending on policy wording. A practice that reports an occurrence to the Building Safety Regulator without simultaneously notifying its PI insurer can find itself with regulatory engagement that the insurer subsequently disputes coverage for.
Documented notification protocol: any complaint, dispute, quality issue, sub-consultant defect, regulatory engagement, or possible claim is logged within 48 hours and reviewed for notification within 7 days; partner-level approval for notification decisions; bias toward over-notification rather than under-notification ("if in doubt, notify"); written broker confirmation of notification with retained correspondence; clear definition in policy wording of what constitutes a "circumstance" requiring notification.
Policy wording with broad "circumstances likely to give rise to a claim" notification scope plus extended reporting periods is preferable to narrow "claim received" wording. Specialist placement can negotiate "deeming clauses" that treat appropriately-notified circumstances as if claims were made during the policy period, locking in the policy that responds. Generic PI policies often have narrow notification wording; specialist architects PI should have broader, more protective wording.
13. Risk 5: Run-off and cessation cover
Run-Off Cover — The 30-Year Tail Problem
When an architectural practice ceases trading — through retirement, sale, merger, or insolvency — the historic claim exposure does not cease. Claims on past work can be made for many years afterwards under the claims-made principle (no policy in force = no cover regardless of when work was done). The ARB recommends a minimum of 6 years' run-off cover on cessation, but the Building Safety Act's 30-year retrospective DPA limitation has made even 6 years look short for any practice with significant HRB or cladding exposure. Our PI run-off cover guide explains how run-off works.
Run-off cover is procured at the point of cessation and runs as a single block of cover for the agreed period. It is typically more expensive per annum than active cover (no offsetting fee income to base premium on) but materially cheaper than the alternative: principals personally exposed to historic claims for decades after they thought they had retired.
On planned cessation, engage broker 6+ months in advance to plan run-off placement; consider run-off limit carefully — match to highest historic project value, not current activity; preserve all project files and records (claim defence depends on documentation that may need to be available decades after the work); document practice closure and ARB notification; for principals approaching retirement, plan personal cover positioning — some run-off policies include named principal cover, others do not.
Run-off PI is a specialist placement — generic markets often don't write it, or write it on unfavourable terms. Period length 6-10 years is typical for practices with low historic exposure; 10-15 years increasingly common for practices with HRB or cladding work in history. Cost typically 2-5x annual active premium for the full run-off period combined. Specialist broker placement is essential — bad run-off cover can leave principals personally exposed at exactly the moment they have least appetite for it.
14. Risk 6: Building Liability Orders and corporate veil exposure
Building Liability Orders — The Corporate Structure Risk
Building Liability Orders, introduced by Section 130 of the Building Safety Act 2022, allow courts to make an order against an "associated body corporate" requiring it to meet the liability of another body. The effect: the corporate veil can be pierced and assets of associated companies — parent companies, subsidiaries, sister companies — can be reached to satisfy building safety liability. The first order was made in 381 Southwark Park Road RTM Co Ltd v Click St Andrews Ltd (2024), where the Technology and Construction Court made an associated company liable for the developer's building safety liabilities. For architectural practices with group structures, parent/subsidiary arrangements, or associated trading entities, this is material new exposure.
Group structure review with PI implications in mind; ensure each operating entity has appropriate PI scope (not "rely on the parent"); document distinct operating roles where multiple group entities exist; consider corporate restructuring where current arrangements create BLO exposure that PI cannot fully address; engage legal advice on BLO defensive positioning for practices with significant group exposure.
PI cover should explicitly contemplate BLO scope — policy wording matters here. Specialist architects PI in 2026 increasingly includes specific BLO defence cover; generic PI typically doesn't address it. D&O cover at director level is important where BLO defence could engage individual directors. Legal Expenses with BSA defence scope provides additional defence cost cover. Generic commercial market placement often doesn't contemplate these exposures; specialist Lloyd's market does.
15. Risk 7: Principal Designer duties under the Building Safety Act
Principal Designer Role — The New Claim Category
Since 1 October 2023, a Principal Designer role under the Building Regulations has sat alongside the existing Principal Designer role under the CDM Regulations 2015, and the two are often held by the same architect. On higher-risk buildings, the Principal Designer must plan, manage, and monitor design work to ensure compliance with building regulations and maintain the "golden thread" of design information across the three gateways (planning and design, construction, occupation). Failure of golden thread management, gateway documentation, or mandatory occurrence reporting can give rise to PI claims even without an underlying design error.
The claim profile is distinct from traditional design negligence. The duty is procedural and documentary: did the Principal Designer maintain the right records, manage information appropriately, check sub-consultant competence, and report occurrences as required? A failure in any of these processes can ground a claim by a developer, contractor, or building owner whose project was delayed, refused gateway approval, or required remedial work. Claim values £10,000–£500,000+ depending on project size and consequential loss.
Principal Designer competence documented — formal training, professional body recognition, CDM PD competence checks; golden thread information management protocol; sub-consultant competence checking process with documented evidence; gateway documentation preparation in advance, not at the gateway moment; mandatory occurrence reporting protocol with clear thresholds; engagement letter terms that distinguish PD duties from design duties.
PI with PD scope explicitly within civil liability cover — generic civil liability wording typically responds to PD claims but specific specialist wording is preferable. D&O important for individual director PD competence challenges. Legal Expenses with BSA defence scope covers regulatory engagement with the Building Safety Regulator. Practices acting as PD should specifically declare this at renewal and confirm scope in writing; non-declaration creates non-disclosure risk that could void cover on a substantial claim category.
16. Risk 8: Contract requirements vs ARB minimum gap
Contract PI Requirements — The £250k vs £5m Gap
The ARB minimum of £250,000 each-and-every-claim is a regulatory floor, not a target. Most professional services contracts require significantly more. Standard RIBA-style appointments typically reference £1m–£2m. Local authority and public sector frameworks routinely require £2m–£5m. Healthcare, education, and defence projects can require £5m–£10m. Large commercial developments require limits matched to project value. Insurance panel and framework agreements typically specify minimums.
The risk pattern: practice has ARB-compliant £250k cover, signs a contract requiring £2m without checking, fails to upgrade cover, then either operates in breach of contract (allowing client to terminate or claim damages) or — worse — has a claim that exceeds cover, leaving the architect personally exposed for the shortfall.
Contract review process that flags PI requirements specifically; PI limit matched to actual highest contract requirement, not ARB minimum; aggregate vs each-and-every limit understood and communicated to clients (some contracts specify each-and-every); written broker confirmation of cover limit and aggregation; midterm cover uplift where new contract requires higher limit; clear documented refusal to undertake work where required limits cannot be obtained at acceptable cost.
PI limit matched to actual contract specs — typically £1m–£2m for small practices with mixed work, £2m–£5m for mid-sized with public sector or commercial work, £5m+ for higher-risk projects. Each-and-every-claim basis preferable to aggregate where contract requires; aggregate acceptable for cladding/fire safety per ARB. Specialist broker placement allows limit structure to be negotiated rather than taken off-the-shelf. The premium uplift from £250k to £1m is typically modest; the contractual exposure is dramatically different.
17. What drives the cost of architects PI insurance in 2026?
Architects PI pricing in 2026 reflects the regulatory transformation under the Building Safety Act and the genuine claim exposure differential between project types. Indicative annual premium ranges:
| Practice Profile | Indicative Annual Premium 2026 |
|---|---|
| Sole practitioner — domestic and small commercial, £40k–£100k fee income | £750–£2,200 |
| Sole practitioner with mixed work — including some new-build residential, £80k–£200k fees | £1,800–£4,500 |
| Small practice (2-5 staff) — low-rise residential and commercial fit-out, £200k–£500k fees | £4,000–£8,500 |
| Small-mid practice (6-12 staff) — commercial and mixed-use, £500k–£1.5m fees | £8,500–£18,000 |
| Mid-sized practice (13-25 staff) — full sector mix including some HRB, £1.5m–£4m fees | £18,000–£45,000 |
| HRB / cladding-exposed practice — significant higher-risk building work, any size | £25,000–£75,000+ |
| Run-off cover — typical 6-year run-off on cessation, mid-sized practice | £15,000–£40,000+ for full period |
The factors below drive both insurance premium and overall renewal outcome. The rating impact within each profile band is typically larger than the differential between profile bands — meaning a small practice with poor renewal preparation can pay more than a mid-sized practice with excellent preparation.
| Rating Factor | Impact on Premium | What You Can Do |
|---|---|---|
| Fee income and growth trajectory | Primary scaling factor for PI | Declare accurately including planned growth |
| Project mix — sector and complexity | Domestic lowest; HRB and cladding highest | Declare every project type specifically; misdeclaration is non-disclosure |
| Cladding and fire safety exposure | Material premium driver in 2026 post-Wren wind-down | Detailed historical project register; clear scope documentation |
| HRB and BSA project exposure | Significant premium uplift for active HRB work | Document Principal Designer competence, golden thread protocol |
| Renewal preparation maturity | Well-presented risks get noticeably better terms | 15-page risk presentation; project list; complaint register; QA documentation |
| Claims history | 5+ year impact; undisclosed circumstances catastrophic | Disclose proactively; document root cause and remedial action after any claim |
| QA system and risk management | A documented system improves terms | RIBA Plan of Work alignment, peer review, change control, design audit |
| Limits selected vs contract requirements | £1m/£2m/£5m rate differently | Match to actual contract specs; specialist negotiated structure |
| Retroactive date | Continuous full retroactive cover preferable | Confirm at every renewal; preserve continuity at broker change |
| Continuing professional development | Training records support better terms | Fire safety training, BSA familiarisation, CDM PD training |
| Geographic operating area | UK-only lower; overseas work materially higher | Declare operating area; consider separate cover for overseas |
| Broker placement | Specialist architects brokers access better terms | Use broker with documented architects PI experience and Lloyd's access |
| Continuity with insurer | Insurers value long-term continuity | Strategic continuity decision; don't chase £200 savings |
18. Illustrative claims and how to manage them
The examples below are illustrative composites based on the types of claims seen in architects PI. Names, figures and details are not those of a real practice.
Illustrative claim — Cladding Aggregation Dispute, £340,000 Settlement
A mid-sized architectural practice had been the design architect on a 14-storey residential building completed in 2014. Post-Grenfell external wall surveys identified that the cladding system specified did not comply with current Approved Document B requirements (a position complicated by the materials having been signed off as compliant at the time of specification). The freeholder commissioned remediation works costing approximately £4.2m and brought a claim under the Defective Premises Act against the design team, including the architect, alleging negligent specification.
The practice's PI policy responded but with two complications. First, the cladding aggregate sub-limit of £500,000 applied — capping the cover available across all cladding claims in the policy period. Second, the policy excluded consequential losses, meaning alternative accommodation costs for displaced residents (approximately £180,000) fell outside cover. Settlement: £340,000 (direct loss share negotiated proportionate to alleged design responsibility). Defence costs: £62,000. Total claim: £402,000.
Post-claim renewal: cladding aggregate sub-limit reduced to £250,000; consequential loss exclusion broadened; supplementary questionnaire on all historic cladding work required; premium increased 65%. The practice subsequently restructured its approach to historic cladding work — proactive client engagement on remediation projects, documentation of design intent at the time, and separate professional advice arrangements for fire safety on new HRB work.
The lesson: cladding aggregation is the dominant 2026 claim category and the wording matters enormously. £500k aggregate may sound substantial until you face a £4m remediation claim with proportionate liability. Specialist placement negotiates direct loss preservation, aggregation structure, and clear definitions of in-scope cladding system types.
Illustrative claim — Non-Disclosure Avoidance, £180,000 Uninsured Loss
A small architectural practice (4 staff) was notified by a domestic client that water damage in the master bedroom was occurring through what subsequently transpired to be inadequate detailing of a roof junction on a new-build extension completed 18 months earlier. The practice resolved the matter directly with the client at a cost of approximately £24,000 in remedial works contributed (paid from practice cash flow, not notified to insurer). Two years later, the client's contents insurer brought a subrogated claim for the consequential damage to fitted furniture and electronics, totalling £156,000.
The practice notified the claim to its PI insurer. The insurer's investigation revealed that the original complaint and the contributed remedial cost had not been disclosed at the two intervening renewals. The insurer alleged non-disclosure under the Insurance Act 2015 — the original complaint constituted a "circumstance likely to give rise to a claim" that should have been notified at the time and disclosed at renewal. The insurer avoided the policy as to this matter, treating it as if no cover had been in place.
The practice was left to settle the subrogated claim from its own resources. Settlement: £156,000. Personal contributions from partners (corporate cash flow inadequate): £75,000 across the two partners. Defence costs: £22,000 (also uninsured). Total uninsured loss: £180,000+.
The lesson: the original "informal resolution" was a false economy. Properly notified at the time, the original £24,000 contribution would have triggered PI investigation, formal client communications under privilege, and likely a different settlement structure. More importantly, it would have been disclosed at subsequent renewals as a matter on the register. The Insurance Act 2015 fair presentation duty is rigorous; non-disclosure is the most common UK PI claim avoidance trigger and the most preventable. Disclose every circumstance, even those resolved without formal claim.
Illustrative claim — Run-Off Inadequate Limit, £625,000 Settlement
A retired partner from a mid-sized architectural practice (now ceased) had personally been the design lead on a 7-storey residential building completed in 2008. The practice ceased trading in 2019 with 6-year run-off cover at £1m each-and-every-claim — the same limit as active cover had been. In 2025, under the Building Safety Act's extended DPA limitation, the leaseholders brought a claim through their freeholder for defective structural design of the building's load-bearing internal partition system, which had cracked progressively. Remediation cost £2.8m; the developer (still trading) had primary liability but joined the architect.
The run-off PI responded with its full £1m limit. The settlement attributed to the architect was £1.625m. The £625k shortfall fell to the partners personally — proportioned between them under their partnership agreement (since the practice had been an LLP and individual partner liability flowed through the agreement). The retired partner who had been design lead bore the largest share. Settlement on his account: £445,000.
The lesson: run-off cover limit decisions made at cessation need to reflect highest historic project value, not "what we had as active cover". The 30-year retrospective DPA limitation means claims from 2008 work are actionable now under cover purchased in 2019. The retired partner had assumed 6 years of cover was adequate; under the BSA it manifestly wasn't. For practices approaching cessation, run-off planning should be a 6-12 month project, not a final-week decision.
Claims Management Steps
How to respond to a potential architects PI claim, notification, or regulatory engagement — the steps below are critical given the multi-policy and multi-regulator exposure typical of 2026 architectural practice:
- Notify your PI insurer immediately on awareness of any potential claim or circumstance. The threshold is "circumstance likely to give rise to a claim" — much lower than "formal claim received". Late notification can void cover regardless of merit. When in doubt, notify; over-notification has no downside.
- Do not engage substantively with the complainant before insurer engagement. Acknowledge receipt politely and confirm you will respond formally. Do not admit fault, apologise in writing, or offer remedial work — these can be interpreted as admissions and may prejudice cover.
- Preserve all project documentation rigorously. Design drawings, specifications, change records, sub-consultant communications, client correspondence, site visit records, meeting minutes, photographs. The defence depends on the documentation pack. Where electronic, ensure backup and integrity preservation.
- Engage your broker as well as your insurer. The broker is your advocate; the insurer is the underwriter. Specialist architects PI brokers know the wording, the precedents, and the negotiation patterns. Don't try to manage a PI claim without broker support.
- Consider regulatory parallel engagement. Where the claim involves ARB Code matters, the Building Safety Regulator, or Housing Ombudsman issues, parallel regulatory engagement may be necessary. Engage Legal Expenses cover for the regulatory dimension; engage PI for the civil claim dimension.
- Manage Building Safety Act-specific notifications carefully. Mandatory Occurrence Reporting to the BSR may be required; ensure this is coordinated with PI notification. Building Liability Order applications should be flagged to insurer early for defensive positioning.
- Conduct internal root cause analysis and document remedial action. Identify what went wrong and what the practice has done to address it. Insurers reviewing renewal will ask what's changed; courts assessing damages will consider remedial steps; ARB may consider this in regulatory action.
- Update QA and operational documentation to address the gap identified. Where the claim revealed a process gap (no peer review, no design audit, no contract check), update the standard operating procedure to close the gap going forward. This is both insurance and regulatory defence — and reduces renewal premium impact.
Glossary of architects PI insurance terms
- ARB (Architects Registration Board)
- The statutory regulator of architects in the UK under the Architects Act 1997. Maintains the Register of Architects, sets the Architects Code of Conduct, and operates the Professional Conduct Committee. New ARB Code took effect 1 September 2025.
- RIBA (Royal Institute of British Architects)
- UK professional body for architects with chartered status. RIBA membership requires PI insurance and provides additional professional standards beyond ARB regulatory minimums.
- Each-and-Every Claim Basis
- PI policy structure where the limit of indemnity applies separately to each claim made during the policy period. The ARB minimum of £250,000 is on this basis. Preferred where contract requires specific minimum per claim.
- Aggregate Basis
- PI policy structure where one limit applies to all claims in the period combined. ARB accepts aggregate basis for cladding, fire safety, asbestos, and pollution claims since 2022. Higher risk for the insured where multiple claims might arise.
- Claims-Made Basis
- The standard PI policy structure — the policy responds to claims notified during the current policy period, regardless of when the underlying work was performed (subject to retroactive date). Requires continuous renewal to maintain cover for past work.
- Retroactive Date
- The date from which work performed is covered by the current claims-made PI policy. "Full retroactive cover" or "inception of practice" means all historic work is covered; a later retroactive date means pre-date work is uninsured.
- Run-Off Cover
- PI cover purchased at the point of practice cessation to respond to claims notified after trading has ceased for work performed during active practice. ARB recommends minimum 6 years; 10+ years prudent given Building Safety Act 30-year DPA limitation.
- Civil Liability Basis
- PI cover wording that responds to all civil liability arising from professional services, not just negligence. ARB requires civil liability basis cover. Important because Building Safety Act includes non-fault-based remedies.
- Fair Presentation of the Risk
- The duty under the Insurance Act 2015 to proactively disclose every material circumstance the insurer would want to know at proposal and renewal. Includes information known by senior management and what a reasonable search would reveal.
- Building Safety Act 2022 (BSA)
- UK legislation introduced following the Grenfell Tower fire. Extended Defective Premises Act limitation to 30 years retrospectively, introduced Building Liability Orders, expanded Principal Designer duties, and created the Building Safety Regulator.
- Defective Premises Act 1972 (DPA)
- UK legislation imposing duty on those involved in providing dwellings to ensure the work is done in a workmanlike manner with proper materials. Limitation extended to 30 years retrospectively by BSA Section 135 for pre-28 June 2022 claims.
- Building Liability Order (BLO)
- Court order under Building Safety Act Section 130 requiring an "associated body corporate" to meet building safety liability of another body. Pierces the corporate veil; affects architectural practices with group structures.
- Principal Designer (PD)
- Two statutory roles share this name: one under the CDM Regulations 2015 (health and safety) and one under the Building Regulations since 1 October 2023 (compliance with building regulations), with extra duties on higher-risk buildings. Responsible for planning, managing, and monitoring design work and maintaining the "golden thread" of design information.
- Higher-Risk Building (HRB)
- Building of at least 18 metres or 7 storeys with at least 2 dwellings, plus hospitals and care homes (for design-phase rules). Subject to enhanced regulatory regime under Building Safety Act including gateways and mandatory occurrence reporting.
- Golden Thread
- The body of design and construction information maintained for higher-risk buildings throughout design, construction, and occupation phases. Principal Designer's responsibility to manage on HRB projects.
- Mandatory Occurrence Reporting (MOR)
- BSA-required reporting system for "safety occurrences" on higher-risk building projects. Reports to Building Safety Regulator. Mismanagement can create PI claim category independent of design error.
- Wren Insurance Association
- Mutual insurance association for architects that announced in March 2026 it will not offer renewal terms from 1 July 2026. Wind-down removes meaningful cladding capacity from architects PI market.
Frequently asked questions
The Architects Registration Board sets the minimum at £250,000 each-and-every-claim under the Code of Conduct effective 1 September 2025. This is a floor, not a target. Most professional services contracts require significantly more — typically £1m–£2m for RIBA-style appointments, £2m–£5m for public sector and framework agreements, and £5m+ for healthcare, education, and large commercial projects. Holding the ARB minimum but signing a contract requiring more puts you in breach of contract. Match your PI limit to actual contract requirements, not the regulatory minimum.
The Building Safety Act fundamentally changed architects PI exposure. Section 135 extended the Defective Premises Act limitation to 30 years retrospectively for claims accruing before 28 June 2022, meaning work from the mid-1990s is still actionable today. Section 130 introduced Building Liability Orders allowing courts to hold associated companies responsible for another's building safety liability. Principal Designer duties were expanded for higher-risk buildings, creating new PI claim categories around golden thread management and mandatory occurrence reporting. At renewal, expect more detailed supplementary questionnaires on historic projects, cladding, fire safety, and HRB work — and place specifically with brokers who understand BSA exposure.
The Wren Insurance Association announced in March 2026 that it will not offer renewal terms from 1 July 2026 and will wind down through a solvent exit. For Wren members, alternative placement must be secured — start conversations 90–120 days before expiry as capacity is tight. For non-Wren architects, the broader consequence is reduced cladding capacity, harder underwriting, and increased premium pressure. The 2026 architects PI market rewards preparation more than at any time in the recent past. Detailed risk presentation, project lists, complaint registers, and clear scope documentation are now essential for accessing good terms.
Indicative 2026 annual premiums: sole practitioners £750–£4,500 depending on project mix; small practices (2-5 staff) £4,000–£8,500; small-mid (6-12 staff) £8,500–£18,000; mid-sized (13-25 staff) £18,000–£45,000; HRB or cladding-exposed practices £25,000–£75,000+. Run-off cover for a ceasing mid-sized practice typically £15,000–£40,000+ across a 6-year period. Pricing depends on fee income, project mix, claims history, cladding/HRB exposure, limits selected, renewal preparation maturity, and broker placement. Better renewal preparation generally improves terms; for context on broader PI pricing principles see our professional indemnity broker guide.
The Insurance Act 2015 requires you to proactively disclose every material circumstance the insurer would want to know at proposal and renewal — including information known by senior management, those responsible for arranging insurance, and what a reasonable search of available information would reveal. For architects, classic non-disclosure patterns are: not declaring a circumstance that might give rise to a claim (a dispute, complaint, or quality issue, even if not yet a formal claim); not declaring cladding or fire safety work on historic projects; not declaring change in practice structure; not declaring overseas work; not declaring acceptance of unusual contract terms. Non-disclosure is the most common cause of UK PI claim avoidance — and the most preventable. Disclose everything; over-disclose rather than under-disclose.
Almost certainly on aggregate basis with restrictions. The ARB has formally accepted since 2022 that cladding and fire safety cover can be held on an aggregate basis (one limit applies to all cladding claims combined) and limited to direct losses (excluding consequential losses such as alternative accommodation, business interruption, and contents damage). The Wren Insurance wind-down from 1 July 2026 has tightened cladding capacity further. At renewal in 2026, expect supplementary questionnaires on cladding history, aggregate sub-limits typically £250k–£1m, and clear definitions of in-scope cladding system types. Specialist broker placement can negotiate wording — for example, preserving direct loss cover, distinguishing cladding system types by risk, and structuring aggregation across the policy period rather than across all historic claims.
Run-off cover is PI insurance purchased at the point of practice cessation to respond to claims notified after trading has ceased for work performed during active practice. The ARB recommends a minimum of 6 years on cessation. The Building Safety Act's 30-year retrospective Defective Premises Act limitation has made 6 years look short for any practice with significant HRB, cladding, or higher-value residential exposure in its history — 10–15 years is increasingly prudent. Run-off cover is a specialist placement; generic markets often don't write it well. For partners approaching retirement, run-off planning should be a 6–12 month project, not a final-week decision. See our insurance after insolvency or liquidation guide for related cessation scenarios.
A Building Liability Order, introduced by Section 130 of the Building Safety Act 2022, allows the court to make an order against an "associated body corporate" requiring it to meet the liability of another body that has incurred building safety liability. The effect is that the corporate veil can be pierced — assets of associated companies (parent, subsidiary, sister) can be reached. For architectural practices with group structures, parent/subsidiary arrangements, or associated trading entities, this is material new exposure that traditional PI didn't contemplate. PI cover should explicitly contemplate BLO scope; D&O cover at director level matters where BLO defence could engage individual directors; Legal Expenses with BSA defence scope provides additional defence cost cover. Specialist placement increasingly addresses this; generic placement often doesn't.
The retroactive date is the date from which work performed is covered by your current claims-made PI policy. "Full retroactive cover" or "inception of practice" means all your historic work is covered; a later retroactive date means pre-date work is uninsured. Broker changes, market exits, and insurer restructures can result in unwitting retroactive date movement — leaving years of historic work uninsured even where premium has been paid continuously. Combined with the Building Safety Act's 30-year retrospective DPA limitation, this is the single largest hidden exposure in the 2026 architects PI market. Confirm retroactive date on every policy renewal, preserve all prior policy schedules as continuity evidence, and review carefully at every broker change.
90+ days before expiry is the standard for the 2026 market — not 30 days. The market is tight, capacity is selective, and underwriters allocate time to risks that present themselves well. Practices arriving in market with detailed 15-page risk presentations, complete project lists, complaint registers, contract review processes, and QA documentation access the best of available terms. Practices arriving with a 4-page proposal form and last-minute scrambling access the worst, or face refusal to quote on harder risks. The Wren wind-down has compressed demand further. For Wren members renewing 1 July 2026, start now; for others, embed 90-day preparation into your renewal cycle as standard practice.
Yes — PI is the core but not the whole picture. The supporting programme typically includes: Employers' Liability (legally required with any staff); Public Liability for site visits and client interactions; office contents and property; cyber insurance (essential given client data, CAD files, and ransomware exposure — see our cyber insurance guide); Business Interruption for operational continuity; Directors and Officers cover where partner-level Building Safety Act exposure matters; Legal Expenses for contract disputes and ARB regulatory engagement; commercial vehicle where applicable. For broader commercial cover principles see our business liability insurance UK guide.
Look for brokers with specific experience in architects PI, design-led professional indemnity, and Building Safety Act exposures evidenced by: specialist articles or guides on architects PI, cladding cover, and BSA exposure; willingness to discuss specific exposures (cladding aggregation, BLO, principal designer duties, retroactive date continuity, run-off planning) in detail; access to Lloyd's market and specialist MGAs rather than just mainstream commercial markets; a listing on the FCA Financial Services Register and a documented track record. Avoid brokers offering "PI" without discussing architects specifics; brokers who can only quote one or two markets; brokers who don't ask about cladding exposure, HRB work, or retroactive date in detail at proposal. Miller & Partner specialise in this sector — see our professional indemnity product page and the broader PI insights hub.
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