Finding out that a property you want to buy has spray foam insulation doesn’t automatically mean you should walk away, but it does mean slowing down and doing some extra checks before you commit to an offer.
Spray foam in the UK — the key numbers
Who will lend where spray foam was retrofitted?
Sources: House of Commons Library briefing CBP-10658 · PCA & HomeOwners Alliance joint letter (May 2025) · BBC research (Nov 2024) — full detail on our spray foam statistics page.
What a RICS Survey Will Tell You
A Level 2 or Level 3 RICS survey should flag spray foam insulation if the surveyor can access the loft and see it. The report should note whether it is open-cell or closed-cell foam, whether roof timbers are visible for inspection, and whether there are signs of damp, condensation or timber decay. If the surveyor cannot properly inspect the timbers because of the foam, they will usually recommend a further specialist investigation before you proceed.
Can You Get a Mortgage on a House With Spray Foam?
It depends on the lender. Some lenders – including TSB, Skipton, Co-operative Bank and Principality – currently decline properties with spray foam. Others, including Halifax, Nationwide and HSBC, will lend where a satisfactory specialist assessment and the right documentation are in place, particularly where roof timbers remain inspectable and sound. It is worth speaking to a mortgage broker early, before you commit to a purchase.
Talk it through with a free, independent adviser — no obligation, and we carry out no removals ourselves.
Questions to Ask the Seller or Estate Agent
- When was the spray foam installed, and by which company?
- Is it open-cell or closed-cell foam?
- Is there a manufacturer warranty or evidence report available for the installation?
- Has the property had any damp, condensation or timber problems since the foam was installed?
Should You Walk Away or Negotiate?
Spray foam insulation is not automatically a dealbreaker, but it is leverage. Many buyers successfully negotiate a reduction in the asking price to cover the cost of removal, or make removal a condition of the sale before exchange. If a lender has already declined a mortgage on the property because of the foam, or the survey has revealed timber damage underneath it, walking away may be the safer option.
Get Free, Independent Advice Before You Commit
The National Spray Foam Advisory provides free, independent guidance to UK buyers and homeowners dealing with spray foam insulation, and can connect you with vetted specialists for an inspection or removal quote. Get in touch before you commit to a purchase.
Worried about spray foam problems in your home? Call us free on 0800 494 7163 or leave a message about your situation and we will give you the advice you need to resolve it — and a full understanding of the guidance around spray foam and how it applies to your home. We are a free, independent advisory service and we carry out no removals ourselves.
Related guidance
- how spray foam affects a mortgage — What lenders look for, and what documentation helps.
- which mortgage lenders accept spray foam — A sourced, dated summary of lender positions.
Dealing with spray foam in your own home?
Talk it through with an independent advisor first — free, no obligation, and in many cases removal isn’t even needed.
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Helpful guides: what removal costs · selling with spray foam · real homeowner cases