Should I buy a house with spray foam insulation?

RICS advises that if you are buying a property with spray foam already in it, you should “ensure this documentation is available as this will assist in any queries received from the valuer, lender or legal representatives.” Ask through your solicitor, so the answers come back in writing as part of the enquiries:

If the seller has lost the paperwork, the government paper says the installer or manufacturer “should be able to provide it retrospectively.” A seller who cannot or will not produce any of it is telling you something too. If you are not sure the foam is there at all, see how to tell if a house has spray foam.

Usually, yes. A standard home survey or mortgage valuation may record that spray foam is present, but it cannot see the timbers behind it. RICS says a surveyor who finds spray foam “may request an independent specialist report”, and that its presence “could affect a surveyor’s professional opinion of value”.

“Before making any decision about your spray foam, you should take advice from a specialist surveyor.” DESNZ, Spray foam insulation: Remediation, removal and lending, 22 October 2026

The paper points to the Property Care Association’s find a specialist tool, which lists members in its spray foam assessor category, and says to make sure your surveyor is familiar with the Spray Foam Insulation Inspection Protocol (March 2023).

When you instruct your own surveyor, ask before you book whether they are comfortable reporting on a spray foam roof, and whether they will need to bring in a specialist. The seller has to agree to give access, so ask early. Our guide to RICS surveys and spray foam explains the different levels of survey. Our sister service National Spray Foam Advice can arrange a specialist survey.

Read the wording of the report closely. “Unable to inspect the roof timbers” is a limitation of the survey. “Evidence of decay” or high moisture readings is a finding about the house, and a much bigger conversation.

Either can work. What matters is that your request rests on evidence about this house rather than a guess. Professional removal typically costs £50–£80 per m², which is about £3,000–£8,500 for most UK lofts, and takes 2–5 days for most three-bedroom homes. Open-cell foam usually sits at the lower end and closed-cell at the upper end. Timber repairs and re-insulation are extra, and nobody can price repairs until the timbers can be seen.

Asking for a price reduction

Get a written removal quote for the property and put it to the seller with the survey findings. A specific, sourced figure is easier to defend than a request for money off. If the survey finds no sign of timber problems, the case rests on the removal cost. If it finds decay or damp, that is a separate, larger conversation, and possibly a reason to withdraw. Arranging removal yourself after completion means you choose the company and the report is in your name. Our spray foam removal cost guide shows what a quote should include.

Asking the seller to remove it first

If your lender will only lend once the foam is out, removal before completion may be the only way to proceed. Then ask who will do the work, and ask for photographs of the bare timbers, the invoice and a written report or certificate before you exchange. Check with your lender that it will accept that evidence. Removal adds time, so allow for it in your moving date. See what a removal certificate and report cover.

Be more cautious, or consider withdrawing, if:

• the survey finds timber decay, damp or structural movement, rather than only that the timbers could not be inspected;
• the seller will not allow a specialist inspection before exchange;
• there is no paperwork and neither the seller, the installer nor the manufacturer can supply it;
• your lender will not lend while the foam is in place, and removal does not fit your timetable or budget;
• the house is listed. RICS says spray foam must not be installed in a listed building without prior listed building consent, and that foam applied without consent “will be reflected in the surveyor’s valuation”;
• the asking price takes no account of a foam problem the seller already knows about.

If you go ahead

Keep every document in one folder: the installation paperwork, the survey, your lender’s letter and, if you remove the foam later, before and after photographs, the invoice and the removal report. The next buyer’s surveyor and lender will ask for them. Do not try to strip the foam yourself: read why DIY spray foam removal goes wrong. When the time comes to move on, our guide to selling a house with spray foam insulation covers what buyers will ask you. If the foam later causes damage and the installer is still trading, our guide to spray foam claims and complaints sets out the routes the government paper names.

1. Spray foam insulation: Remediation, removal and lending (22 October 2026), Department for Energy Security and Net Zero
2. Spray foam insulation: consumer guide, Royal Institution of Chartered Surveyors (RICS)
3. Sprayed foam in roofs: advice for homeowners, Property Care Association
4. Spray Foam Insulation Inspection Protocol, March 2023, Property Care Association
5. IMA statement on spray foam, February 2026, Insulation Manufacturers Association
6. Spray Foam Customer Guidance (joint guidance linked from the government paper), PCA, IMA, RPSA and others

Each source was read on 14 November 2026. Prices are our own editorial figures, not statements by the bodies above. Lender policies change: check your own lender’s current requirements.