Subsidence & Underpinned Property Insurance for UK Landlords
Once a let or commercial building has a subsidence history, insuring it changes character completely. A past claim, a period of monitoring, or an underpinned foundation sits on the record, and the property owners' market that quotes freely on the rest of your schedule will either decline that address, exclude the very peril you're worried about, or load the premium hard. If you've tried to move a portfolio or a single commercial unit after a subsidence claim and hit a wall of refusals, you've met the problem this guide addresses.
This is written for landlords, portfolio owners, blocks of flats freeholders and commercial property owners — the people who have to keep a tenanted building insured, meet a lender's conditions and answer to leaseholders. It is not a homeowner explainer on spotting cracks. It covers what the record shows and who can see it, why moving insurer is so hard, how underpinning is treated, what the Insurance Act 2015 duty of fair presentation requires of a commercial policyholder, and how a specialist broker places cover that the standard property owners' market won't. Subsidence sits in the same adverse lane as our RAAC property insurance and spray foam property insurance guides — a flag that stops standard underwriters, until the risk is presented properly.
Why does a property with a subsidence history need specialist placement?
Subsidence — the downward movement of the ground beneath a building's foundations — is one of the most heavily flagged perils in UK property insurance, and for good reason. It is expensive to investigate and repair, it can recur, and the underlying driver is getting worse: clay soils shrink in drought and swell when the rain returns, a mechanism sharpened by climate volatility. Insurers watch the domestic market closely as the leading indicator, and ABI figures for 2025 showed record household subsidence payouts of £307 million, the highest on the ABI's records, after an exceptionally hot, dry spring and summer. Property owners' and commercial underwriters read that trend and tighten appetite accordingly.
For an underwriter, a building that has already moved is not the same risk as one that hasn't. Once there is a claim on the record, the question is no longer "might this move?" but "this address has form — will it happen again?" That single shift is why standard, schedule-rated property owners' insurers back away. They are built to price clean risks at volume across a portfolio; a flagged building needs a human underwriter who will look at the cause, the repair, and the evidence that the movement is resolved. Buildings in high-risk clay and former mining areas may be refused outright — which is precisely where a specialist placement earns its keep.
For a landlord or freeholder, keeping that cover in force is not optional. A tenanted building that loses buildings insurance breaches mortgage and lease conditions, undermines the duty to keep a let home free from serious hazards, and on a block leaves you exposed to leaseholders who pay for insurance through the service charge. This is adverse-risk property placement — the core of what Miller & Partner does.
The Insurability Framework™
A building with a subsidence history is exactly what the Insurability Framework was built for. Where a standard property owners' insurer sees a claim on the record and declines, our task is to turn that flag into a properly evidenced, defensible risk. We apply four pillars to every placement of this kind.
Underwriter Intelligence
We know which markets underwrite subsidence history and what convinces them — the cause, the repair method, any Certificate of Structural Adequacy, monitoring results and whether movement is resolved. Presenting these up front turns a decline into a quote.
Difficult Risk Expertise
Flagged and underpinned buildings fall outside standard property owners' appetite. We place them through specialist schemes and Lloyd's-backed markets that assess the ground and the remediation on their merits, not on the claim keyword alone.
Risk Assessment
We identify the exposures a subsidence history creates — recurrence risk, ongoing-movement cover gaps, the subsidence excess, loss of rent exposure during works, and underinsurance where a reinstatement now includes underpinning and superstructure repair.
Claims Advocacy
If a flagged building moves again, you get a named broker who manages the investigation and argues your corner with the underwriter — not a call centre. On subsidence claims, where investigation alone can run for months while tenants sit in the building, that advocacy is often decisive.
Key facts owners need to know
- Subsidence is rated on the address, not the policyholder — buying a building does not leave its claims history behind, and the flag transfers with the property.
- For residential lets and blocks, past claims are recorded on the CUE database (Claims and Underwriting Exchange) and visible to insurers for around six years.
- For commercial buildings, there is no equivalent central register — the history surfaces through the claims experience you are required to present, which makes the quality of your disclosure the whole game.
- After a claim, your incumbent insurer will usually continue to offer cover at renewal — but moving insurer is where owners hit refusals.
- A Certificate of Structural Adequacy (CSA) confirming movement is resolved is the single document that opens up more markets.
- Underpinning does not make a building uninsurable — some insurers decline it outright, but specialist markets accept it with the right documentation.
- Under the Insurance Act 2015, a commercial policyholder owes a duty of fair presentation — a materially higher bar than a consumer's, and subsidence history sits squarely within it.
Historic or ongoing subsidence — why does the distinction change everything?
The first question any subsidence underwriter asks is whether the movement is resolved or still active. These are two entirely different risks, and getting the classification right — with evidence — is what determines whether your building is a standard-adjacent placement or a hard specialist one. The table below sets out the split.
| Factor | Historic / resolved subsidence | Ongoing / unresolved subsidence |
|---|---|---|
| Status | Cause removed, movement stabilised | Movement continuing or under investigation |
| Key evidence | Certificate of Structural Adequacy | Monitoring data, engineer's interim reports |
| Insurer appetite | Broader — several specialist property owners' markets | Narrow — incumbent insurer often the realistic route |
| Moving insurer | Possible with the right documentation | Very difficult until resolved |
| Subsidence excess | Standard (often £1,000) | Often higher, sometimes with restrictions |
| Loss of rent | Normally available on standard terms | Frequently restricted while movement is live |
| Typical outcome | Placeable via specialist with CSA | Stay with incumbent; re-market once resolved |
What claims record can an underwriter actually see?
It depends on the tenure, and the distinction matters more than most owners realise.
Residential lets, blocks and portfolios of dwellings. The Claims and Underwriting Exchange (CUE) is an industry database on which insurers record household claims and incidents, including subsidence, typically visible for around six years. A prospective insurer can check CUE against the property address — so a subsidence claim made by you or a previous owner is not something you can quietly leave behind by moving insurer. It follows the building, not the policyholder.
Commercial buildings. There is no equivalent central register. The history instead surfaces through the claims experience you are required to present, through survey, and through the underwriter's own file if the risk has crossed their desk before. That sounds like more room for manoeuvre. It is the opposite: with no database to fall back on, the accuracy and completeness of your presentation carries the entire weight of the duty of fair presentation, and an insurer that later discovers an undisclosed movement history has a straightforward remedy against you.
Either way, the conclusion is the same. You are far better presenting the history openly, with the evidence that the movement was resolved, than hoping a proposal form doesn't ask. If you've already been turned away, our guidance on insurance after being refused cover explains how re-presentation works.
"The difficult calls are the landlords who bought a let property not knowing it had a subsidence claim from a previous owner. They go to renew or move the schedule, CUE flags the address, and suddenly every mainstream quote vanishes. They didn't cause it, they didn't hide it — they just inherited a flag they knew nothing about."
"What we've learned is that the Certificate of Structural Adequacy is worth its weight in gold. A building that gets an instant 'previous subsidence — declined' becomes a real conversation once we can put a CSA, the repair details and the cause in front of a specialist underwriter. The claim is on the record either way; the difference is whether it's presented as a resolved problem or left as a bare red flag."
Why is it so hard to move insurer after a subsidence claim?
This is the trap that catches most owners. Under long-standing industry practice, your existing insurer will generally continue to offer cover at renewal even after a subsidence claim — the so-called continuing-insurer principle. That keeps you insured, but it also removes your leverage: you feel stuck, because the moment you try to move, new insurers see the flag and decline. The result is a captive renewal that can drift upward year after year, and on a block that increase lands on leaseholders through the service charge, where you have to justify it.
A specialist broker breaks that deadlock. With the cause documented, the repair evidenced and a Certificate of Structural Adequacy in hand, we can approach markets that will take on a resolved subsidence history — giving you an alternative to an incumbent you can no longer negotiate with. It is the same logic as any other business insurance with a claims history: the claim doesn't vanish, but a well-presented risk attracts competition again.
Does underpinning make a building uninsurable?
No — but it is widely misunderstood. Underpinning is a remediation: it strengthens and extends a foundation that has moved. Logically, a properly underpinned building should be a better risk than one still moving, and specialist insurers treat it that way. The problem is that many standard property owners' insurers apply a blunt scheme rule — "underpinned, no appetite" — and decline automatically, regardless of how sound the works are.
The route through is documentation. A Certificate of Structural Adequacy, the underpinning specification and completion certificate, any guarantee, and evidence that the cause (a tree, a leaking drain, clay shrinkage, historic mine workings) has been dealt with, together turn "underpinned" from a red flag into a stabilised, insurable risk. We place underpinned let and commercial buildings regularly on exactly this basis.
What must a commercial policyholder disclose?
Everything material — and the bar is higher than most owners expect. Under the Insurance Act 2015, a commercial policyholder owes a duty of fair presentation: you must disclose every material circumstance you know or ought to know, in a reasonably clear and accessible way. That "ought to know" is the part that catches portfolio owners out, because it extends to what a reasonable search of your own organisation would turn up — your managing agent's records, your surveyor's reports, the file from the property you bought three years ago. Subsidence history, previous claims including a prior owner's, visible cracking, current monitoring and any underpinning are all clearly material.
This is a materially stricter duty than the one a consumer owes on a home policy, where the test is only to take reasonable care not to make a misrepresentation. If you own a let portfolio or a commercial building, you are on the commercial side of that line, and the consequences of getting it wrong are severe. A deliberate or reckless breach lets the insurer avoid the policy from inception, keep the premium and refuse all claims; even an innocent breach gives a proportionate remedy that can slash a payout or retrospectively impose the terms the insurer would have applied. Full, evidenced disclosure is your protection, not your risk.
Cover Checker: what does your subsidence property actually need?
Pick the property type closest to yours to see the cover a specialist builds around a subsidence history. Indicative only — your placement is built around your actual building, cause and evidence.
Underwriter readiness checklist
Tick each item you can already evidence. The more you tick, the closer your flagged building is to a clean specialist placement. Blanks are what to resolve before going to market.
- I know the cause of the previous subsidence (tree, drain, clay, mining)
- The cause has been removed or dealt with
- I hold a Certificate of Structural Adequacy
- I have the repair / underpinning details and any guarantee
- Monitoring (if any) shows movement has stabilised
- I have a full claims experience for the address, and know what CUE records if it is residential
- My reinstatement sum insured reflects underpinning / superstructure repair cost
- I have disclosed the history to my current insurer
How insurable is your subsidence property right now?
Two questions give an indicative insurability tier. Guidance only — not a quote or a survey.
What drives the premium on a subsidence property?
Once a specialist market agrees to look at a flagged building, the premium turns on a familiar set of rating factors, each sharpened by the subsidence history. Most owners fixate on price; the better use of your energy is the mitigation column, because that is what moves a decline to a quote and a heavy loading to a fair one.
| Rating factor | Why it raises the premium | How to mitigate it |
|---|---|---|
| Movement status | Ongoing movement is far harder than resolved | Evidence stabilisation / obtain a CSA |
| Cause | Recurring causes (clay, trees, mine workings) worry insurers | Show the cause has been removed or managed |
| Repair method | No repair record = unknown quantity | Provide underpinning / repair documentation |
| Certificate of Structural Adequacy | Without it, resolution is unproven | Obtain and supply the CSA |
| Soil / location | High-clay and former mining areas rated up | Provide site and soil data, monitoring results |
| Trees & drains | Nearby trees and leaking drains recur as causes | Evidence tree management and drain repairs |
| Reinstatement sum insured | Must include underpinning + superstructure repair | Commission a current reinstatement cost assessment |
| Subsidence excess | Flagged buildings carry higher excesses | Negotiate terms via a broker; evidence resolution |
| Claims frequency | More than one movement event compounds concern | Present full context and remedial work |
| Tenancy & occupancy | Unoccupied units, mid-works and high tenant turnover raise risk | Meet inspection and security conditions; confirm trades in occupation |
| Loss of rent exposure | Works can displace tenants for months | Set an indemnity period that reflects real subsidence timescales |
| Presentation quality | Vague submissions get declined or loaded | Full fair presentation via a broker |
| Portfolio spread | One flagged address can taint a whole schedule | Present the flagged risk on its own evidence, not buried in the bordereau |
How do landlord and freeholder duties interact with a subsidence building?
For a landlord, losing cover on a subsidence property is not just a mortgage issue. The Homes (Fitness for Human Habitation) Act 2018 and the Housing Health and Safety Rating System expect a let home to be free from serious hazards, and active structural movement is a serious hazard. On a block, the lease will almost always oblige the freeholder or management company to insure the structure — a failure there is a breach owed to every leaseholder paying for it through the service charge, and it is exactly the sort of thing that surfaces at a First-tier Tribunal.
Just as importantly, letting cover lapse mid-movement can be catastrophic: if you drop the incumbent before a claim is resolved, you may find no one will pick the risk up, leaving a live subsidence problem uninsured across a tenanted building. The British Geological Survey maps shrink-swell risk that underwriters draw on, so the geography is not something you can talk your way around — but a documented, disclosed, actively-managed history is something a specialist can place. Keeping continuous cover in force, alongside the evidence of resolution, is central to managing a subsidence property responsibly.
Three claim scenarios subsidence owners should learn from
These are fictionalised composites of the placements and claims we see, with realistic figures. Two show how subsidence cover goes wrong; the third shows it going right.
The undisclosed move
A landlord moved a let house onto a cheaper policy, and did not mention a subsidence claim from five years earlier — reasoning it was "old news." The claim was still recorded on CUE against the address. When fresh movement triggered a new claim, the insurer checked CUE, found the earlier event and established that it had never been disclosed.
Treated as a reckless breach of the duty of fair presentation under the Insurance Act 2015, the policy was avoided from inception and the claim declined. The landlord funded the works, lost the rent for the duration, and then had to re-place cover through a specialist at a heavily loaded rate.
The underpinned building standard insurers wouldn't touch
A let property underpinned eight years earlier, with a Certificate of Structural Adequacy and a completion guarantee on file, was auto-declined by every standard property owners' insurer on the single word "underpinned." Placed instead through a specialist market that read the documents, it was insured normally. When a storm later brought down part of a chimney, the claim was settled without fuss.
The £18,000 non-subsidence claim was met in full — on a building that would have been uninsurable through a standard scheme, purely because a specialist was willing to assess the underpinning on its merits.
The ongoing movement that was properly disclosed
A commercial-let building showed fresh cracking, and the owner reported it to a properly-disclosed insurer that had subsidence cover in force. Rather than gambling on a move to a cheaper market, they had stayed with the incumbent. The insurer funded a full investigation, which traced the cause to a leaking drain, then paid for the root-cause repair and the superstructure works.
Because the history was disclosed and the cover was in place, the claim was managed and paid — the leaking drain fixed, the building repaired, the commercial tenant kept in occupation and the rent roll intact throughout.
How to insure a building with a subsidence history: a step-by-step approach
If you own or let a building with a subsidence history, work through these eight steps in order. Done properly, they turn a flag that standard markets decline into a risk a specialist can quote — and give you back the ability to move.
- Establish the status. Is the movement historic and resolved, or ongoing? This single classification governs everything that follows — confirm it with a structural engineer if you're unsure.
- Gather the evidence. Pull together the cause, the repair or underpinning details, any guarantee, monitoring results and — crucially — the Certificate of Structural Adequacy that confirms resolution.
- Assemble the claims record for the address. For residential lets, find out what the Claims and Underwriting Exchange holds. For commercial buildings, compile a full claims experience from your own and your managing agent's files, so there are no surprises.
- Understand your incumbent position. Your current insurer will usually keep offering cover after a claim. Don't drop it until you have a firm specialist alternative in place.
- Recalculate your reinstatement sum insured. Include underpinning and superstructure repair costs, and check the loss of rent indemnity period reflects how long subsidence works actually run. An out-of-date figure invites the condition of average on a claim.
- Make a fair presentation. Disclose every material circumstance you know or ought to know under the Insurance Act 2015 — history, past claims including a previous owner's, cracking and monitoring. Run a reasonable search of your own records and your agent's before you sign.
- Instruct a specialist broker. Ask a broker with non-standard and Lloyd's market access to present the risk to subsidence-friendly insurers who price the history on its facts.
- Compare terms, not just price. Check the subsidence excess, any ongoing-movement restrictions and exclusions. Keep monitoring and your CSA current, and re-market as resolution strengthens.
John Miller
John has 13+ years placing property risks that standard markets decline, with direct access to Lloyd's and specialist MGA schemes. Subsidence history, underpinned buildings and post-claim re-placement are a core part of Miller & Partner's adverse-risk practice, across single lets, portfolios, blocks of flats and commercial buildings. If your property has been refused or you're stuck with an incumbent you can't negotiate with, John's team presents the history — with the evidence — to markets that will actually compete for it. More about John.
Subsidence property insurance glossary
- Subsidence
- The downward movement of the ground beneath a building's foundations, causing the structure to sink and crack.
- Heave
- The opposite of subsidence — the ground swelling and pushing a foundation upward, often after tree removal on clay soil.
- Landslip
- The downhill movement of ground on a slope, a related but distinct peril to subsidence.
- Clay shrink-swell
- The tendency of clay soils to contract in drought and expand when wet — the most common cause of UK subsidence.
- Made ground
- Ground formed from imported or infilled material that may be poorly compacted and prone to movement.
- Underpinning
- A remediation that strengthens and extends a foundation to stabilise a building that has subsided.
- Certificate of Structural Adequacy (CSA)
- A document issued after subsidence works confirming the movement is resolved and the structure is sound — key to insuring or moving insurer.
- CUE (Claims and Underwriting Exchange)
- An industry database recording household claims, including subsidence, visible to insurers for around six years. It covers dwellings — commercial buildings have no equivalent central register.
- Claims experience
- The record of past claims a commercial policyholder is required to present to underwriters, usually covering the last three to five years.
- Continuing-insurer principle
- The practice under which your current insurer generally keeps offering cover after a subsidence claim.
- Subsidence excess
- The amount you pay towards a subsidence claim, typically higher than a standard excess (often around £1,000).
- Crack monitoring
- The use of tell-tales and readings over time to establish whether movement is active or has stabilised.
- Root cause investigation
- The process an insurer funds to identify why subsidence occurred before authorising repairs.
- Superstructure repair
- Repairs to the visible building — walls, plaster, finishes — following stabilisation of the foundation.
- Loss of rent
- Cover for rental income lost while an insured event makes a let building wholly or partly untenantable, limited by the indemnity period selected.
- Property owners' liability
- Liability cover for injury or damage arising from the ownership of a building, distinct from the buildings damage cover itself.
- Fair presentation of risk
- The Insurance Act 2015 duty on a commercial policyholder to disclose every material circumstance they know or ought to know, clearly and accessibly.
- Material circumstance
- Information that would influence a prudent underwriter's decision — subsidence history clearly qualifies.
- Condition of average
- A clause that reduces a claim proportionately where the sum insured is below the true value at risk.
- Adverse risk
- A risk standard markets decline or restrict, requiring specialist placement — the category subsidence history falls into.
Frequently asked questions
Yes, in most cases — but rarely through a standard property owners' scheme. A building with a subsidence history needs a specialist market that will underwrite it on its facts. The outcome depends heavily on whether the movement is resolved and whether you hold a Certificate of Structural Adequacy.
Every material circumstance you know or ought to know, under the Insurance Act 2015 duty of fair presentation. Subsidence history, previous claims including a former owner's, cracking, monitoring and underpinning all qualify. "Ought to know" extends to a reasonable search of your own records and your managing agent's, which is the part portfolio owners most often miss.
For residential lets and blocks, subsidence claims are recorded on the Claims and Underwriting Exchange (CUE), which insurers check against the property address for around six years — a claim made by you or a previous owner follows the building. For commercial buildings there is no central register, so the history comes out through the claims experience you present, through survey, or through the underwriter's own file.
A standard, schedule-rated property owners' insurer often will, especially in high-clay or former mining areas or where movement is unresolved. A specialist market is different: given the cause, the repair evidence and a Certificate of Structural Adequacy, it can offer terms on a resolved history. Being declined once means the risk was presented to the wrong market, not that it is uninsurable.
It's harder, but possible. Your existing insurer usually keeps offering cover, which can leave you captive as the premium drifts up — painful on a block where leaseholders question the service charge. With the history documented and a CSA in hand, a specialist broker can approach markets that will take on a resolved subsidence risk. Never drop your current cover until an alternative is firmly in place.
No. Underpinning is a remediation, so a properly underpinned building should be a better risk than one still moving. Many standard insurers decline it automatically, but specialist markets accept underpinned buildings with a Certificate of Structural Adequacy, the completion documents and evidence the cause has been dealt with.
It is a document issued after subsidence works confirming the movement is resolved and the structure is sound. It is the single most useful piece of evidence for insuring or moving a flagged building, because it lets an underwriter treat the history as a closed problem rather than an open risk.
Historic subsidence is resolved — the cause removed and movement stabilised, ideally with a CSA. Ongoing subsidence is still moving or under investigation. Historic cases can often be placed with a specialist and even moved; ongoing cases usually mean staying with your incumbent until the movement is resolved and re-marketing afterwards.
The subsidence excess is typically higher than a standard buildings excess — often around £1,000, and sometimes more on a flagged building. It is the amount you contribute towards any subsidence claim. A broker can help negotiate terms, and strong evidence of resolution supports a more reasonable excess.
Usually yes on a resolved history, but check two things: whether loss of rent is restricted while movement is live, and whether the indemnity period is long enough. Subsidence investigation and repair routinely run past twelve months, so a short indemnity period can leave a real gap on a tenanted building.
It can. If further movement occurred, reinstatement might involve underpinning and superstructure repair, which add cost. A sum insured set without accounting for that — or never reviewed — risks the condition of average reducing a claim. Have the reinstatement figure reassessed.
A refusal from a standard route is not the end of the road. A specialist broker can re-present the risk with the cause, the repair evidence and a CSA to markets that underwrite subsidence history. The problem is almost always the market it was presented to, not the building itself.
For a flagged building, almost certainly. A specialist broker makes the difference between a decline — or a captive incumbent renewal — and a competitive quote. Miller & Partner places subsidence-history and underpinned let and commercial buildings through Lloyd's-backed and specialist markets, and approaches every case through The Insurability Framework — underwriter intelligence, difficult-risk expertise, risk assessment and claims advocacy.
Related specialist cover
Other hard-to-place property risks
Subsidence is one of several property histories that push owners out of the standard market. These are the others we place most.
- Block of flats insuranceBuildings cover for freeholders, RMCs and landlords of multi-unit blocks.
- Landlord buildings insurance renewal helpRenewal loaded, declined or full of new exclusions? Have the building re-broked.
- Flood zone 3 commercial property insuranceInsuring commercial and let property in high-risk flood areas.
- Commercial property insurance after a claimDeclined or non-renewed after flood, fire, subsidence or escape of water.
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