Solar Power Business Insurance UK 2026 | Miller & Partner
Why solar businesses need specialist insurance in 2026
UK solar has moved firmly into the mainstream. Total installed capacity reached 22.3 GW by the end of April 2026 across more than two million installations, growing more than 11% year on year, and the government's Solar Roadmap targets at least 45 GW by 2030 — roughly doubling the fleet this decade. Small-scale rooftop deployment hit a new MCS record in 2025, and with the Warm Homes Plan, near-mandatory rooftop solar on new homes and record contracts-for-difference auctions all feeding the pipeline, the businesses installing, maintaining, cleaning and operating solar have never been busier.
That growth brings scrutiny. A solar business carries a distinctive mix of exposures: high-energy DC electrical work that can cause fire, near-constant work at height, design and yield advice the customer relies on financially, and a position in the product supply chain for panels and inverters. A generic tradesman or commercial policy rarely answers all of those, and the gaps tend to surface at exactly the wrong moment — after a roof fire, a fall, or a performance dispute. Ground-mounted, utility-scale sites are a separate risk, covered on our solar farm insurance page.
This guide covers the cover a solar business actually needs in 2026, whoever you are in the sector — domestic and commercial installers, operations-and-maintenance contractors, panel cleaners, and ground-mount or rooftop operators. It explains the eight risks that drive claims, how Microgeneration Certification Scheme (MCS) status, BS 7671 and DNO compliance feed into your insurability, and the policy structure that responds to each. It sits within our renewable energy installer insurance hub, alongside guides on air source heat pump insurance, EV charging installer insurance and battery storage installer insurance. If you want our solar installer product page, see solar panel installer insurance; for cleaning-only businesses, see solar panel cleaning insurance. If you own the generating assets rather than install them, see community energy group insurance and small wind turbine insurance.
Key facts at a glance
- UK solar passed 22.3 GW and 2 million installations by April 2026, growing 11%+ year on year, with a government target of at least 45 GW by 2030 — a fast-expanding market and a fast-expanding pool of risk.
- The headline exposure is a rooftop fire from a DC fault — arc faults, failed connectors, isolators and hot-spots are the recognised solar fire causes, and a roof fire in occupied premises is the high-severity event underwriters price around.
- Working at height is the dominant injury risk — falls remain the leading cause of serious injury in the trade, exposing employees, the self-employed installer and the public below.
- Design, yield and savings advice is a professional indemnity exposure — when a system underperforms against quoted generation or savings, or structural/loading advice proves wrong, the loss is financial, which public liability does not cover.
- You usually sit in the product supply chain — supplying panels, inverters and optimisers can carry strict liability for defective product under the Consumer Protection Act 1987, making products liability essential.
- MCS certification underpins commercial credibility — required for Smart Export Guarantee eligibility and most grant work, with consumer-code membership (RECC or HIES), and a strong positive signal to insurers.
- Solar work is notifiable and grid-connected — Part P self-certification through a Competent Person Scheme, compliance with BS 7671, and G98/G99 DNO notification all apply and all feed into how your work is underwritten.
1. The 8 biggest solar-business risks: summary table
These are the risks that drive claims and underwriting questions for UK solar businesses. A specialist policy covers all eight; a basic tradesman policy typically covers one or two and leaves the high-severity exposures thinly covered.
| Risk | Frequency | Severity | Primary cover |
|---|---|---|---|
| Rooftop fire from DC fault | Rare per job | Catastrophic | Public & Products Liability |
| Working at height / falls | Routine exposure | High (injury) | Employers' & Public Liability |
| Design / yield / structural advice | Common (disputes) | Medium-High | Professional Indemnity |
| Defective product supplied | Occasional | High | Products Liability |
| Damage to client property | Common (roof leaks) | Low-Medium | Public Liability |
| Installation defect | Occasional | High | Public Liability + rectification |
| Subcontractor / labour-only | Where used | Medium-High | Liability with labour-only basis |
| Underinsurance / non-disclosure | Common (unnoticed) | Catastrophic | Correct proposal-stage disclosure |
2. MCS, BS 7671 and the DNO: the rules that shape your cover
Solar work sits across several overlapping frameworks, and underwriters treat compliance with them as a proxy for how well you manage risk. Evidencing the items below at proposal is what separates a competitive quote from a loaded one.
MCS and the solar PV installation standard
The Microgeneration Certification Scheme certifies installers and products for small-scale solar. MCS certification is needed for Smart Export Guarantee (SEG) eligibility and most grant-funded work and requires membership of a consumer code such as RECC or HIES. An unbroken MCS history is a strong positive insurance signal; commercial and ground-mount work above the MCS threshold is judged instead on engineering competence and references.
BS 7671, Part P and fire-safe DC design
Domestic solar and associated electrical work is notifiable under Part P of the Building Regulations, self-certified through a Competent Person Scheme (NICEIC, NAPIT, ELECSA, ECA or Stroma), with an Electrical Installation Certificate at commissioning and compliance with the current edition and amendments of BS 7671. For solar specifically, the fire-critical details are DC isolation, correctly rated and terminated DC cabling, quality connectors (mismatched or poorly crimped connectors are a known fire cause), surge protection and, where relevant, arc-fault considerations.
DNO notification — G98, G99 and G100
Grid-connected systems must be notified to the local Distribution Network Operator. Systems up to 3.68kW per phase use the G98 fit-and-notify route (notify within 28 days of commissioning); larger systems need G99 approval before installation, typically two to eight weeks, with commercial arrays taking longer. G100 governs export limitation. Getting the route or the export limits wrong is both a compliance failure and a professional indemnity exposure if the customer loses out.
Working at height and roof structure
Almost all rooftop solar work engages the Work at Height Regulations 2005, and many jobs also depend on the roof being able to carry the array — a structural judgement that can become a professional indemnity claim if it is wrong. Documented method statements, access planning and structural sign-off are both good practice and underwriting positives.
3. Risk 1: Rooftop fire from DC faults
Rooftop Fire — The Catastrophic Exposure
A solar PV system runs high-voltage DC across a roof, and the recognised fire causes — DC arc faults, failed or mismatched connectors, faulty isolators, and hot-spots from shading or cell damage — can ignite the roof of an occupied building. The absolute risk per installation is low, but the severity is the worst a solar business faces: property damage, business interruption for a commercial client, injury and potential third-party spread. Where the cause traces to workmanship or a product you supplied, you are in the frame.
Design and install to BS 7671 and the IET guidance; use quality, compatible connectors correctly crimped; specify reputable panels, inverters and isolators; commission and test thoroughly; keep photographic and certification records of every install; give customers clear isolation and emergency guidance.
Public Liability for third-party property damage and injury; Products Liability where the panel, inverter or component you supplied is implicated — best held on the same policy. Set the limit to the buildings you work on (£5m is common on commercial roofs and terraced/high-value housing, not £1m), and confirm in writing that solar PV fire is in scope, not excluded.
4. Risk 2: Working at height
Working at Height — The Injury Exposure
Solar is roof work, and falls are the leading cause of serious and fatal injury in the trade. The exposure runs to employees, labour-only staff, the self-employed installer themselves, and to the public from dropped tools, panels and components. Scaffolds, roof anchors, ladders and fragile-roof risk on commercial buildings all feature. This is the risk most likely to produce an Employers' Liability claim and an HSE investigation.
Risk-assess access and fall risk on every job; use appropriate edge protection and access equipment; check for fragile roofs; train and supervise staff; keep method statements; cordon work areas below to protect the public.
Employers' Liability is a legal requirement at £10m if you have any staff, including labour-only. Public Liability covers injury to third parties and damage from falling objects. Confirm working at height (and any work above a given height) is declared and in scope — some cheaper policies restrict it.
5. Risk 3: Professional indemnity — design, yield and structural advice
Professional Indemnity — The Financial-Loss Gap
Solar businesses advise as well as install: you model generation and savings, advise on roof suitability and loading, specify equipment and handle DNO applications. When a system underperforms its quoted yield, when a savings projection proves optimistic, when structural advice about a roof turns out wrong, or when a DNO export limit throttles a commercial client's expected income, the loss is financial. Public liability does not respond to pure financial loss — professional indemnity does, and consumer-code complaints frequently turn on exactly these issues.
Base yield and savings on proper modelling and real data; put figures in writing with clear caveats; obtain structural sign-off where loading is marginal; document tariff, SEG and DNO assumptions; avoid over-promising payback.
Professional Indemnity scoped for renewable design and specification, with an efficacy element where you promise generation or savings. Limits typically £250k–£1m for domestic-focused businesses, higher for commercial and ground-mount. Run-off cover matters because yield and performance disputes surface years after handover.
6. Risk 4: Product liability
Products Liability — The Supply-Chain Exposure
When you supply and fit panels, inverters, optimisers or mounting systems, you are in the product supply chain. Under the Consumer Protection Act 1987, a supplier can carry strict liability for damage caused by a defective product — even where the defect was the manufacturer's, particularly if the manufacturer is overseas, insolvent or hard to pursue. With solar, a defective inverter or connector and a fire claim are often the same event from two angles.
Buy from reputable manufacturers and keep proof of provenance; stay within products you are trained to install; keep warranties and recall notices on file; retain a paper trail linking each install to the products used so recovery against the manufacturer is possible.
Products Liability, ideally combined with Public Liability so there is no argument about which section responds. Confirm an adequate limit (£5m is common) and that solar components are in scope. If you only ever fit free-issue product the customer bought, tell your broker — the exposure differs.
7. Risk 5: Damage to client property
Property Damage — The Everyday Claim
The claims a solar business actually makes most often are mundane: a roof penetration that leaks and damages ceilings, cracked or slipped tiles, damage to a customer's wiring or decor, or a dropped panel. Individually small, collectively the most frequent claim type — and water ingress from a roof fixing is the classic solar example. Public Liability answers it, with a sensible limit and excess for the property values you work on.
Public Liability matched to your typical job; pre-work condition photos to settle disputes quickly; prompt notification to your broker of any incident that "may give rise to a claim".
8. Solar business cover checker
Select the profile that best fits your business to see the cover that typically applies. For the wider trade picture see our renewable energy installer insurance hub.
Solar Business Cover Checker
Select your profile to see the recommended insurance programme
Sole Trader Solar Installer
- ESSENTIAL Public Liability £2m–£5m with solar PV work in scope
- ESSENTIAL Products Liability on the same policy
- ESSENTIAL Working at height declared
- ESSENTIAL Tools & equipment cover
- RECOMMENDED Professional Indemnity for yield / savings advice
- CONSIDER Contract works; goods in transit; personal accident
Established MCS Installer With Staff
- LEGAL Employers' Liability £10m
- ESSENTIAL Public & Products Liability £5m
- ESSENTIAL Professional Indemnity for design & specification
- ESSENTIAL Tools, plant & contract works
- RECOMMENDED Efficacy / financial-loss extension
- CONSIDER Commercial vehicle fleet; business interruption
O&M / Maintenance Contractor
- LEGAL Employers' Liability £10m if you have staff
- ESSENTIAL Public Liability £5m with working at height in scope
- ESSENTIAL Professional Indemnity — fault diagnosis & remedial advice
- RECOMMENDED Products Liability where you replace components
- CONSIDER Care, custody & control for systems you maintain
Panel Cleaning Business
- ESSENTIAL Public Liability £2m–£5m with working at height in scope
- LEGAL Employers' Liability if you have staff
- RECOMMENDED Damage to the system you're cleaning (care, custody & control)
- CONSIDER Equipment cover for poles, pumps, access kit
- CONSIDER See our solar panel cleaning insurance guide
Commercial / Ground-Mount
- LEGAL Employers' Liability £10m
- ESSENTIAL Public & Products Liability £5m–£10m to meet contract terms
- ESSENTIAL Professional Indemnity at commercial limits
- ESSENTIAL Contract works / contractors all risks
- RECOMMENDED Collateral warranties & JCT obligations reviewed
- CONSIDER Use the commercial combined route for larger operators
Subcontract / Labour-Only
- ESSENTIAL Public Liability £2m–£5m on a labour-only basis
- ESSENTIAL Confirm whether you supply product — if so, Products Liability too
- LEGAL Employers' Liability if you engage any labour-only staff
- RECOMMENDED Tools cover; personal accident
- WATCH Don't assume the main contractor's policy covers you — most don't
9. Compliance readiness self-check
Tick each item your business has in place. The unticked items are your priority gaps — and the ones most likely to attract a loading or restricted terms at quote.
Solar Business Compliance Self-Check
Click each item you have in place. The more ticked, the stronger your insurance position.
- MCS certification current (where applicable) with consumer-code membership (RECC or HIES)
- Competent Person Scheme membership (NICEIC, NAPIT, ELECSA, ECA or Stroma) for Part P self-certification
- Current BS 7671 competence and inspection-and-testing qualification, EIC issued on every job
- Fire-safe DC practice — quality connectors correctly crimped, rated isolation, surge protection
- Work-at-height controls — risk assessments, method statements, edge protection, fragile-roof checks
- Structural sign-off obtained where roof loading is marginal
- DNO process under control — correct G98 / G99 / G100 route, applications and approvals retained
- Product provenance records linking each install to the panels, inverters and components used
- Written yield and savings basis — quotes backed by proper modelling with clear caveats
- Insurance declared for solar PV work — written broker confirmation that products, fire, height and design scope are included
10. Premium & risk estimator
Pick your size and cover level for an indicative position. This is a guide only — your actual terms depend on activities, claims history, limits and disclosure.
Solar Business Premium & Risk Estimator
Select your business size and target cover level
11. Risk 6: Installation defects
Installation Defects — The Frequency Driver
Beyond fire, the technical claims are defects: poor DC terminations, inadequate isolation, incorrect protection, badly sealed roof penetrations, or a mounting/fixing failure that lets an array move or lift in wind. These cause water ingress, system failure, equipment damage or, at worst, fire — and put you on the hook for rectification and consequential loss. As notifiable work, a defect is also a matter for your Competent Person Scheme.
Public Liability for third-party damage flowing from a defect; rectification of your own faulty workmanship is generally excluded from standard PL, so consider financial-loss / efficacy extensions or a contract-works section, and treat design-stage defects as a professional indemnity matter.
12. Risk 7: Subcontractors and labour-only
Subcontractors — The Liability That Flows Back to You
If you use subcontract or labour-only fitters, their work and their injuries can become your liability. Labour-only subcontractors are usually treated as your employees for Employers' Liability purposes, and a bona-fide subcontractor's defective work can still generate a claim against you. The common failure is assuming the other party's policy responds when it doesn't.
Declare your use of labour-only and bona-fide subcontractors at proposal; ensure Employers' Liability covers labour-only staff; verify bona-fide subcontractors carry their own cover at adequate limits and keep evidence; match your liability basis to how you actually work.
13. Risk 8: Underinsurance and non-disclosure
Underinsurance & Non-Disclosure — The Preventable Catastrophe
The most common reason a claim is reduced or declined is not fraud — it is that the policy didn't reflect the work. A solar business on an old electrician's policy that never mentioned PV, products supply or working at height, or with limits set years ago, is the classic trap. The Insurance Act 2015 requires a "fair presentation of the risk" — disclose solar work, products supply, height, O&M, commercial work, subcontractors and turnover accurately.
There is no cover for non-disclosure — the only defence is at proposal stage. Review activities and limits at every renewal; notify your broker mid-term when you add a service line or larger contracts; keep the policy in step with the business.
14. What drives the cost of solar business insurance?
Solar premiums are driven less by headline turnover than by what you do and how well you evidence it. The factors below move terms most.
| Rating factor | Effect | What helps |
|---|---|---|
| Working at height | Roof work is the core injury exposure | Declare it; method statements and access controls |
| Products / PV in scope | Drives the products-liability rate | Quality manufacturers, provenance trail |
| MCS & compliance evidence | Strong positive; absence loads the rate | Current MCS, CPS membership, clean paperwork |
| Liability limit (£2m / £5m / £10m) | Higher limits cost more but match exposure | Set to the buildings and contracts you work on |
| Professional indemnity / efficacy | Adds cost but covers the financial-loss gap | Scope to your actual yield and design advice |
| Commercial / ground-mount mix | Larger work raises limits and complexity | Right limits; contract-works cover |
| Employees & labour-only | Drives Employers' Liability and wages basis | Accurate wageroll; correct labour-only declaration |
| Claims history | Material, especially fire or fall claims | Root-cause and remedial records after any incident |
| Broker / market | Specialist renewable markets price better | Use a broker who understands the trade |
| Disclosure quality | Full disclosure protects the claim | Declare every activity, product line and subcontractor |
15. Real-world claim scenarios
Scenario — Roof fire from a failed connector
Eighteen months after a domestic install, a poorly crimped DC connector arcs and ignites the roof. The fire is contained but causes major roof and loft damage and the family is rehoused for months. Investigation points to the connection. The property-damage and alternative-accommodation claim runs into six figures; Public and Products Liability respond because solar PV fire was in scope and the limit (£5m) was adequate. Had the policy excluded PV fire or been limited to £1m, the installer faced personal exposure. The lesson: connector quality and crimping is a fire-and-insurance issue, and the limit must match the housing.
Scenario — Generation shortfall dispute
A commercial client signs off an array on a quoted annual generation figure used to justify the investment. Real output lands well below the quote because of shading and an over-optimistic yield model. The client pursues the installer for the shortfall and lost savings — a pure financial-loss claim that Public Liability does not touch. The business's Professional Indemnity, scoped for design and yield, covers the defence and settlement. The lesson: if you quote generation or savings, you need PI, and your modelling needs documented assumptions and caveats.
Scenario — Leak from a roof penetration
On a domestic install a roof fixing isn't sealed properly; weeks later rain tracks in and damages a bedroom ceiling and decor. A few thousand pounds of repairs — routine but real. Public Liability covers it, and pre-work photos help settle the customer's wider allegations quickly. The lesson: the everyday claims are frequent and minor, and a sensible PL excess plus good site records keep them painless.
What to do if something goes wrong on a solar job
The steps below protect both your customer and the multiple covers a solar claim can engage:
- Make people safe first. For any fire, get people clear and call the fire service; isolate the system safely if you can do so without risk. For a fall or injury, follow first-aid and RIDDOR procedures. Safety before property, always.
- Notify your broker or insurer immediately. The threshold is "may give rise to a claim". A solar incident can engage Public, Products and Professional Indemnity cover at once — early notification triggers a coordinated response.
- Preserve the evidence. Keep your install records, EIC, DNO paperwork, product batch/serial details, design and yield calculations, method statements and photographs. This pack is your defence and your route to recovery against a manufacturer.
- Do not admit liability. Be factual and helpful, but don't accept fault or commit to remedial work before your insurer has directed the response.
- Engage the manufacturer where product is implicated. Notify the panel, inverter or component manufacturer; warranty and subrogation positions depend on prompt, documented contact.
- Cooperate with any investigation. Provide documentation through your insurer to loss adjusters, fire investigators and the HSE where relevant, and keep your trade body informed where required.
- Close the gap for next time. If the incident reveals a process weakness — a connector type, an access method, a yield assumption — fix the procedure. It is good practice and a better position at renewal.
Glossary of solar business insurance terms
- MCS (Microgeneration Certification Scheme)
- The UK quality scheme certifying small-scale renewable installers and products. MCS certification is needed for Smart Export Guarantee eligibility and most grant work.
- BS 7671
- The UK wiring regulations, including requirements relevant to solar PV such as DC isolation, cable rating, protection and earthing.
- DC arc fault
- An electrical arc in the high-voltage DC side of a solar system, often from a poor connection — a recognised cause of rooftop solar fires.
- G98 / G99 / G100
- Energy Networks Association connection standards. G98 is fit-and-notify up to 3.68kW per phase; G99 needs DNO approval before installation for larger systems; G100 governs export limitation.
- DNO (Distribution Network Operator)
- The regional operator of the local electricity network, which must be notified of, or pre-approve, grid-connected generation.
- Part P
- The Building Regulations provision covering domestic electrical safety. Solar work is notifiable; installers self-certify through a Competent Person Scheme.
- Competent Person Scheme (CPS)
- Government-approved schemes (NICEIC, NAPIT, ELECSA, ECA, Stroma) letting registered installers self-certify notifiable electrical work.
- O&M (Operations & Maintenance)
- Ongoing servicing, monitoring and fault rectification of solar systems — a distinct activity with its own liability and PI profile.
- Public Liability
- Cover for injury to third parties or damage to their property from your work. Core trade cover, but it doesn't respond to your own faulty workmanship or to pure financial loss.
- Products Liability
- Cover for injury or damage caused by a product you supplied. Essential for solar businesses because supplying PV components can carry strict liability under the Consumer Protection Act 1987.
- Professional Indemnity
- Cover for claims from your advice, design or specification — including yield modelling, savings projections and structural/loading advice — responding to financial loss that liability cover does not.
- Efficacy / inefficacy cover
- An extension responding where a system fails to perform as promised. Relevant where you make generation or savings commitments.
- Care, custody & control
- Cover for damage to property in your charge — relevant to O&M and cleaning businesses working on systems they don't own.
- Employers' Liability
- Legally required cover (£10m standard) if you employ staff, including labour-only subcontractors.
- Smart Export Guarantee (SEG)
- The scheme paying for exported electricity; MCS certification is required to access it.
- Fair Presentation of Risk
- The duty under the Insurance Act 2015 to disclose all material facts at proposal and renewal. Breach lets an insurer avoid the policy, reduce a claim or impose different terms.
Frequently asked questions
At a minimum, combined Public and Products Liability with solar PV work in scope and working at height declared, plus Tools cover. Employers' Liability is a legal requirement if you employ anyone, including labour-only. Add Professional Indemnity if you advise on yield, savings or roof loading, because those create financial-loss claims liability cover doesn't answer. Commercial and ground-mount work usually also needs contract-works cover. The key is that the policy reflects solar work specifically — a general electrician's policy often doesn't.
Because a solar business does several risky things a basic policy may not contemplate: high-voltage DC work that can cause fire, near-constant work at height, supplying product (creating strict product liability), and advising on generation and savings. Many cheap policies are public-liability-only, restrict working at height, exclude products and carry no professional indemnity. The gap usually only shows up at claim — after a fire, a fall or a yield dispute — when it's too late to fix.
It depends far more on your activities and limits than on turnover alone — chiefly your working-at-height exposure, whether products are in scope and at what limit, MCS and compliance evidence, whether you need professional indemnity, employee numbers and claims history. A sole-trader installer with sensible limits sits at the lower end; a business with staff, commercial work and full cover sits considerably higher. Specialist renewable markets generally price the risk more keenly. Get a tailored quote rather than relying on a headline figure.
Match the limit to the worst realistic loss, which for solar is a roof fire in occupied or commercial premises. £1m rarely reflects that. £2m is a sensible floor for domestic work; £5m is common and often contractually required for commercial roofs, terraced housing, flats and higher-value homes; commercial contracts sometimes require £10m. The cost difference is usually small relative to the protection, so don't under-buy the limit.
If you advise — modelling generation or savings, advising on roof suitability or loading, specifying equipment, handling DNO applications — then yes. Those are professional services, and when they go wrong the customer's loss is financial, which Public Liability does not cover. Professional Indemnity, ideally with an efficacy element where you promise performance, fills that gap. If you genuinely only fit to someone else's design and make no performance claims, the need is lower, but most solar businesses advise to some degree.
It can and usually should sit on one combined policy, but only if every activity is declared. Solar businesses most often come unstuck through an undeclared activity — a policy set up for installs that never mentioned O&M or cleaning, or vice versa. Declare the full mix, including working at height and any care, custody and control exposure on systems you maintain. For cleaning-only operations see our solar panel cleaning insurance guide.
Yes. MCS certification is a strong positive signal at quote and underpins commercial credibility — it's needed for Smart Export Guarantee eligibility and most grant work. For commercial and ground-mount work above the MCS threshold, insurers look instead at engineering competence, references and project track record. Either way, clean compliance documentation lowers your premium and strengthens your position after a claim.
This guide is the broad explainer for solar businesses of every kind — installers, O&M, cleaning and commercial operators — covering the risks and the cover in depth. If you want to go straight to arranging installer cover, our solar panel installer insurance page is the place to start, and you can begin a quote any time through the tradesman quote form.
Look for a broker who understands the renewable trades and will discuss the specifics — solar PV fire and DC design, working at height, products, yield and design exposure — rather than quoting a generic tradesman policy. They should ask about your MCS status, the products you fit, your limits, your activity mix and your subcontracting. Miller & Partner specialise in this sector; start a quote through our tradesman quote form or see the wider renewable energy installer insurance hub.
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