Spray Foam Insulation Insurance UK: Cover After a Decline
If you own or let a property with spray foam insulation in the roof, you may already have discovered the problem: at renewal, or when you tried to switch, an insurer either declined the risk outright, excluded the roof, or asked questions your last broker never raised. What was sold as an energy upgrade has quietly become one of the most common reasons a UK building becomes hard to insure and hard to mortgage in 2026.
This guide is written for landlords, portfolio owners and commercial property owners — not for the contractors who apply or remove the foam. If you run a spray foam business, the sister guide you need is Spray Foam Removal Insurance UK. This page is about insuring the building itself once the foam is in it: why standard buildings insurers now shy away, what disclosure the Insurance Act 2015 demands of you, and how a specialist broker places cover that a comparison site cannot.
Why does a property with spray foam insulation need specialist insurance treatment?
Spray polyurethane foam (SPF) was sold heavily across the UK through the late 2010s and early 2020s, often on the back of the Green Homes Grant and door-to-door energy pitches. By 2023 the consequences were biting: surveyors, lenders and insurers started treating foamed roofs as a defect risk rather than an upgrade. By 2026, an estimated quarter of a million UK homes are considered effectively unmortgageable because of it — and where a property is hard to mortgage, it is usually hard to insure too, because both hinge on the same underlying concern.
That concern is simple. Closed-cell foam sprayed directly onto the underside of roof tiles or timbers can trap moisture, prevent ventilation and — critically for an underwriter — hide the condition of the roof structure. An insurer pricing a buildings policy is pricing the risk of that roof failing. If the foam masks rot, beetle, nail-sickness or a leak that would otherwise be visible, the insurer is being asked to cover a risk it cannot see. Faced with that, many standard markets simply decline, exclude the roof, or load the premium heavily. RICS has advised its surveyors to be cautious when valuing foamed properties since 2022, which is why valuations come back conditional or refused — and insurers follow the same logic.
For a landlord the stakes are higher than for an owner-occupier. A let property that becomes uninsurable is a compliance and mortgage-covenant problem, not just an inconvenience — most buy-to-let and commercial mortgages require buildings cover to stay in force. This is squarely an adverse-risk placement, and it is exactly the territory Miller & Partner works in every day.
The Insurability Framework™
Placing a foamed-roof property is exactly what the Insurability Framework was built for. When a standard insurer sees "spray foam" and stops reading, our job is to turn a one-line red flag into a properly presented, defensible risk. We work through four pillars on every placement of this kind.
Underwriter Intelligence
We know which markets will look at a foamed roof and what they need to see — the type of foam, the date and method of application, ventilation, and any inspection report. Presenting those facts up front is the difference between a decline and a quote.
Difficult Risk Expertise
Foamed properties fall into the non-standard construction lane that generalist insurers avoid. We place them through specialist schemes and Lloyd's-backed markets that underwrite the roof on its merits rather than declining on the keyword alone.
Risk Assessment
We identify the exposures a foamed roof creates beyond the obvious — hidden timber decay, underinsurance on a rebuild that now needs foam removal, and the disclosure trap that can void a policy after a claim.
Claims Advocacy
If you ever need to claim on a foamed property, you get a named broker who argues your corner with the underwriter — not a call centre reading a script. On adverse risks, that advocacy is often what gets a claim paid.
Key facts at a glance
- An estimated ~250,000 UK homes are now treated as effectively unmortgageable because of spray foam insulation — and unmortgageable usually means hard to insure.
- Closed-cell foam sprayed directly to roof timbers or tiles is the biggest problem; open-cell foam applied after 2018 with proper ventilation is more often accepted.
- RICS has advised valuation caution since 2022, and insurers apply the same logic — a foamed roof they cannot inspect is a risk they may not price.
- Under the Insurance Act 2015, spray foam is almost always a material fact you must disclose — failing to can make a policy voidable and a claim refused.
- Removal typically costs £30–£80 per square metre plus survey and reinstatement — a figure that can push a property into underinsurance if your rebuild sum was never updated.
- A PCA-certified spray foam inspection report can unlock some insurers and lenders where the foam is confirmed non-damaging and the roof sound.
- For landlords, losing buildings cover can breach a mortgage covenant and undermine fitness-for-habitation obligations to tenants.
Open-cell or closed-cell — why does it matter so much to insurers?
Not all spray foam is treated the same way. The single most important thing an underwriter wants to establish is which type you have and how it was applied. The distinction below is the first question we ask on any foamed-property enquiry, because it largely determines whether the risk is placeable in a standard market or needs a specialist.
| Factor | Open-cell foam | Closed-cell foam |
|---|---|---|
| Density & feel | Soft, sponge-like, lower density | Rigid, hard, high density |
| Moisture behaviour | More vapour-open; lower trapping risk if ventilated | Can trap moisture against timber; higher decay risk |
| Applied to | Often battened/ventilated void | Frequently sprayed straight onto tiles/timbers |
| Insurer appetite | Broader — some standard markets consider it with documentation | Narrow — usually a specialist/adverse placement |
| Inspection access | Roof structure often still assessable | Structure hidden; report almost always required |
| Typical outcome | Insurable with a report and disclosure | Insurable via specialist market, or after removal + reinstatement |
"The most frustrating calls I take are from landlords who only find out about the foam problem at renewal — the insurer they'd been with for years suddenly non-renews, they go to a comparison site, and every quote either declines or excludes the roof. By then they're panicking because the mortgage needs cover in force."
"What we've learned placing these is that the outcome is almost entirely about presentation. The same closed-cell roof that gets an instant decline from a portal will get a considered quote from a specialist market once we've documented the foam type, the ventilation, and put a proper inspection report in front of the underwriter. The risk didn't change — the information did."
Do I legally have to declare spray foam to my insurer?
In almost every case, yes. Under the Insurance Act 2015, a commercial policyholder owes a duty of fair presentation of the risk — you must disclose every material circumstance you know or ought to know, or present enough information to put a prudent underwriter on notice to ask questions. The presence of spray foam in a roof is a textbook material fact: it affects both the likelihood of a roof claim and the way that claim would be handled.
Get this wrong and the consequences are severe. If the non-disclosure was deliberate or reckless, the insurer can avoid the policy from inception, keep the premium and refuse all claims. Even an innocent non-disclosure gives the insurer a proportionate remedy — it can reduce a claim payment or apply the terms it would have imposed had it known. Either way, you can be left with a large loss and no meaningful cover. This is why we never let a foamed property go to market on a vague proposal form.
Why do standard insurers decline or exclude foamed roofs?
Understanding the underwriter's thinking helps you fix the problem. Standard buildings insurers decline or restrict foamed properties for a cluster of connected reasons:
- Concealed condition. The foam hides the roof structure, so the insurer cannot verify what it is covering. Hidden timber decay or a slow leak could already be developing unseen.
- Ventilation and moisture. Closed-cell foam applied without ventilation can create the very rot it conceals, turning a maintenance issue into a structural one.
- Removal cost on a claim. If the roof is damaged and needs work, the foam usually has to come off first — adding cost to any repair and inflating the rebuild figure.
- Valuation uncertainty. With RICS advising caution, the insurer cannot rely on a clean valuation, so it cannot confidently set the sum insured.
- Non-standard construction classification. Once flagged, the property drops out of the automated, standard-construction rating that portals rely on.
None of these is necessarily fatal to getting cover. They are, however, fatal to getting cover from a standard, automated route — which is why foamed properties belong with a broker who can reach specialist commercial property and non-standard markets. If you have already been turned away, our guide to insurance after being refused cover explains how re-presentation works.
Cover Checker: what does your foamed property actually need?
Pick the property type closest to yours to see the cover a specialist would build around a spray foam risk. Indicative only — your placement is built around your actual property and foam details.
Underwriter red-flag checklist
Tick each item you can already answer or evidence. The more you can tick, the closer your foamed property is to a clean specialist placement. Blank items are the questions to resolve before you go to market.
- I know whether the foam is open-cell or closed-cell
- I know the approximate date and installer of the foam
- I have (or can obtain) a PCA-registered inspection report
- The roof space is ventilated / the foam was not sprayed straight onto tiles
- There is no known damp, rot or leak under the foam
- My rebuild sum insured reflects the cost of removing foam before any rebuild
- I have disclosed the foam to my current insurer (not just bought online)
- I hold the installer paperwork, warranty or guarantee (IBG/TrustMark)
How insurable is your foamed property right now?
Two questions give an indicative insurability tier. This is guidance, not a quote or a survey.
What drives the premium on a spray foam property?
Once a specialist market agrees to look at a foamed property, the premium is set by a familiar set of rating factors — but each is amplified by the foam. The table below shows what underwriters weigh, and, more usefully, what you can do to move each factor in your favour. Most landlords focus only on price; the smarter move is to work the mitigation column, because that is what turns a decline into a quote and a loaded premium into a fair one.
| Rating factor | Why it raises the premium | How to mitigate it |
|---|---|---|
| Foam type | Closed-cell is rated harder than open-cell | Confirm and evidence the type; don't leave it "unknown" |
| Application method | Sprayed straight to tiles = worst case | Evidence any ventilation void or battening |
| Inspection status | No report = insurer prices blind | Commission a PCA-registered inspection report |
| Roof age & condition | Older roof + concealment = higher decay risk | Provide any pre-foam survey or maintenance record |
| Rebuild sum insured | Must now include foam removal cost | Get a current reinstatement assessment |
| Property use | HMO / holiday let rated above single BTL | Match cover to actual use; don't under-declare |
| Occupancy | Unoccupied or void periods raise risk | Disclose voids; meet inspection/security conditions |
| Claims history | Prior roof/water claims compound concern | Present context and remedial work done |
| Construction type | Non-standard build + foam = double flag | Provide full construction detail up front |
| Location / flood / subsidence | Standard geographic loadings still apply | Provide postcode-level risk data |
| Disclosure quality | Vague proposals get declined or loaded | Full fair presentation via a broker |
| Warranty / guarantee | No installer paperwork weakens the file | Locate IBG / TrustMark / installer documents |
How do landlord duties interact with a foamed, uninsurable property?
For a landlord, losing buildings cover is not only a mortgage problem. The Homes (Fitness for Human Habitation) Act 2018 and the Housing Health and Safety Rating System expect a let dwelling to be free from serious hazards, including damp and structural defects — precisely the conditions a poorly-installed foam can create and conceal. If a concealed roof problem develops into damp or collapse in a let property, an uninsured landlord faces the repair bill and a potential habitation claim at the same time. Where the property is a flat or HMO, fire safety duties under the Regulatory Reform (Fire Safety) Order 2005 add a further layer. Keeping continuous, properly-disclosed cover in force is part of discharging those duties — which is why we treat a foamed let as an adverse-risk priority, not a renewal to leave to the last minute.
Three real-world claim scenarios landlords should learn from
The following cases are fictionalised composites of the placements and claims we see, with realistic figures. They illustrate the two ways foamed properties go wrong — non-disclosure and underinsurance — and the one way they go right.
The undisclosed closed-cell roof
A landlord bought buildings cover through a price-comparison site for a terraced buy-to-let. The proposal never asked about insulation, and closed-cell foam — installed by a previous owner directly onto the rafters — was never mentioned. Eighteen months later, a storm lifted tiles and water ingress was reported. The insurer's surveyor found the undisclosed foam and, beneath it, established timber decay that predated the policy.
The insurer treated the non-disclosure as reckless under the Insurance Act 2015, avoided the policy from inception and declined the claim. The landlord funded the full repair and then had to place cover through a specialist market at a heavily loaded rate.
The underinsured rebuild
A commercial-let building with an open-plan first-floor unit suffered a serious fire. The foamed roof structure had to be stripped and removed before any rebuild could begin, adding cost the owner had never accounted for. The true reinstatement figure came in at £310,000 — but the sum insured had sat at £220,000 for years, never updated for the removal-plus-rebuild reality.
Because the property was under-insured by roughly a third, the insurer applied the condition of average and settled proportionately, leaving a shortfall of over £150,000 on the total loss once removal was factored in.
The properly-placed portfolio
A portfolio landlord held several ex-social-housing lets, most with open-cell foam from a grant-funded scheme. Rather than gamble on portals, the whole schedule was placed through a specialist market with the foam disclosed property-by-property and PCA inspection reports on file. When a mains leak soaked a foamed roof void, the claim was straightforward.
The full £38,000 was met without dispute, because everything the insurer needed to know had been disclosed and priced at inception. The renewal held broadly flat — the opposite outcome to the first two cases.
How to insure a property with spray foam insulation: a step-by-step approach
If you own or let a foamed property, work through these eight steps in order. Done properly, they turn a risk that portals decline into a risk a specialist can quote — and a claim that actually pays.
- Identify the foam. Establish whether it is open-cell or closed-cell, roughly when it was installed and by whom. If it came with the property and you don't know, treat "unknown" as a problem to solve, not a fact to declare.
- Commission an independent inspection. A PCA-registered inspector or RICS surveyor assesses the roof condition beneath the foam and produces a report. This single document unlocks more markets than anything else.
- Gather the paperwork. Locate installer documentation, any Insurance-Backed Guarantee, TrustMark record or warranty. A complete file strengthens the presentation.
- Recalculate your rebuild sum insured. Add the cost of removing the foam before reinstatement. An out-of-date figure is the fastest route to an averaged claim.
- Disclose fully. Make a fair presentation of the risk under the Insurance Act 2015 — the foam, the type, the report, the history. Never rely on a form not asking.
- Instruct a specialist broker. Ask a broker with non-standard and Lloyd's market access to present the risk to insurers who underwrite foamed roofs on their merits.
- Compare terms, not just price. Check whether any quote excludes the roof or the foam. A cheap policy that carves out the very thing you're worried about is not cover.
- Keep evidence and review annually. Retain the report and paperwork, and revisit at each renewal — especially if you remove or re-treat the foam, which can move you back toward standard markets.
John Miller
John has 13+ years placing commercial and property risks that standard markets decline, with direct access to Lloyd's and specialist MGA schemes. Non-standard construction — including spray foam, RAAC and concrete-defect properties — is a core part of Miller & Partner's adverse-risk practice. If your foamed property has been refused or non-renewed, John's team presents it to the markets that will actually underwrite it. More about John.
Spray foam property insurance glossary
- Spray polyurethane foam (SPF)
- The insulation product applied as a liquid that expands and cures in place, commonly sprayed into roof spaces.
- Open-cell foam
- A softer, lower-density, more vapour-open foam that generally presents a lower moisture-trapping risk when ventilated.
- Closed-cell foam
- A rigid, high-density foam that can trap moisture against roof timbers and is the type insurers scrutinise most.
- Property Care Association (PCA)
- The trade body whose registered members carry out recognised spray foam inspections that lenders and insurers may accept.
- RICS
- The Royal Institution of Chartered Surveyors, whose 2022 guidance advises valuation caution on foamed properties.
- Fair presentation of risk
- The duty under the Insurance Act 2015 to disclose all material circumstances, or enough to prompt a prudent underwriter to ask.
- Material fact
- Any information that would influence an insurer's decision to accept a risk or set terms — spray foam almost always qualifies.
- Non-disclosure
- Failing to reveal a material fact; can make a policy voidable and a claim refused.
- Condition of average
- A policy clause that reduces a claim proportionately where the sum insured is lower than the true value at risk.
- Reinstatement / rebuild cost
- The cost to rebuild the property, which for a foamed roof must include removing the foam first.
- Day-one reinstatement
- A basis of cover that applies an inflation uplift to a declared value to reduce underinsurance risk.
- Non-standard construction
- Any building outside conventional brick-and-tile methods — a category foamed roofs are often pushed into.
- Property owners' liability
- Cover for a landlord's legal liability to third parties injured or whose property is damaged in connection with the building.
- Loss of rent
- Cover for rental income lost while a property is uninhabitable following insured damage.
- Insurance-Backed Guarantee (IBG)
- A guarantee that backs an installer's workmanship warranty even if the installer ceases trading.
- TrustMark
- The government-endorsed quality scheme under which some spray foam installations were registered.
Frequently asked questions
Yes, in most cases — but often not through a price-comparison site. Foamed properties usually need a specialist or non-standard market that will underwrite the roof on its merits. The outcome depends heavily on the foam type, whether it is ventilated, and whether you hold an independent inspection report.
Almost always, yes. Spray foam is a material fact under the Insurance Act 2015, so you must disclose it as part of a fair presentation of the risk. Not disclosing it — even where the form never asked — can make your policy voidable and any claim refused.
It can, if the foam was present and not disclosed when you took out or renewed the policy. An insurer that discovers undisclosed foam after a claim may avoid the policy or apply a proportionate remedy. If you have foam and are unsure whether it was disclosed, tell your broker before you ever need to claim.
Closed-cell foam is the greater concern. It is dense, can trap moisture against roof timbers and is often sprayed directly onto tiles or rafters, concealing the structure. Open-cell foam that is ventilated and applied after 2018 is more widely accepted by insurers and lenders.
Usually, yes. Professional removal followed by a structural and timber inspection can return a property to standard-market appetite, because the roof can then be inspected and priced normally. Keep the removal certificate and inspection report — insurers will want to see them.
Removal typically costs in the region of £30 to £80 per square metre, plus survey and any reinstatement of timbers or membrane. The total varies with the area covered and access. Importantly, this figure should also be reflected in your rebuild sum insured while the foam remains in place.
It is an independent report by a Property Care Association-registered inspector confirming the foam type, ventilation and the condition of the roof beneath. It is not always mandatory, but it is the single most useful document for unlocking insurers and lenders, because it lets them assess a roof they otherwise cannot see.
Many insurers tightened their stance on foamed roofs from 2022 onwards, following RICS valuation caution. A property they covered happily for years can be non-renewed as their underwriting rules change. This is common and does not mean the property is uninsurable — it means it now needs a specialist placement.
Potentially on two fronts. Most buy-to-let and commercial mortgages require buildings insurance to stay in force, so losing cover can breach the mortgage. Separately, letting a property with a concealed defect can engage fitness-for-habitation and hazard obligations to tenants. Keeping properly-disclosed cover in force protects against both.
Yes. If the roof ever needs rebuilding, the foam usually has to be removed first, which adds cost. A sum insured set before the foam went in — or never reviewed — is likely too low, exposing you to the condition of average on a claim. Have the rebuild figure reassessed.
A refusal from a standard or automated route is not the end of the road. A specialist broker can re-present the risk with the foam type, ventilation and an inspection report documented, to markets that underwrite non-standard roofs. Being declined once does not mean the risk is uninsurable — it usually means it was presented to the wrong market.
For anything beyond ventilated open-cell foam with a clean report, a specialist broker makes the difference between a decline and a workable quote. Miller & Partner places foamed and non-standard properties 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.
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