Spray foam insulation, mortgages and surveys

If a valuer, surveyor or buyer has raised spray foam in your loft, you're not alone – and it doesn't automatically mean the foam has to come out. Here's what the official guidance actually says.

Why lenders and surveyors are cautious

The Property Care Association (PCA) explains that poor or inappropriate installations can trap moisture, potentially leading to damp, mould and timber decay, and that the foam can make it difficult to properly inspect roof timbers. Because a mortgage valuer can't see the timbers, they may not be able to confirm the roof is sound.

RICS says that if a surveyor encounters spray foam they may request an independent specialist report, and the results could affect their opinion of value. Surveyors must also follow the instructions and policy of the lender they are working for. Foam applied incorrectly – or put into a listed building without consent – will be reflected in the valuation.

Do lenders refuse homes with spray foam?

Not automatically. In a 2025 parliamentary answer, the housing minister said UK Finance and the Building Societies Association advise that their members rely on valuers and surveyors, that spray foam "should not automatically prevent lending", and that decisions should be made case by case following a survey.

In October 2026, government guidance said many mortgage providers are open to lending on properties with spray foam, subject to their own requirements, including Nationwide, Lloyds, Santander, Barclays, NatWest, Coventry Building Society, the Co-operative Bank and HSBC. Requirements vary between lenders and change over time, so check directly with yours or ask a mortgage broker.

What surveyors look for

Surveyors are expected to follow the Sprayed Foam Insulation Inspection Protocol (March 2023), produced by the PCA and the Residential Property Surveyors Association with input from lenders. The protocol suggests three kinds of conclusion:

• the foam doesn't significantly increase the risk of defects and no action is needed now;
• the risk is increased and further advice should be sought to reduce it; or
• there isn't enough information, and further investigation is needed.

The protocol also distinguishes foam sprayed directly onto tiles or slates with no underlay (where it may recommend re-roofing or future removal) from foam applied to a roof with felt or a membrane.

The paperwork that can save you a removal bill

The joint industry Spray Foam Customer Guidance (PCA, Insulation Manufacturers Association, RPSA and others) says a complete handover pack should include:

• a pre-installation evaluation of the roof;
• a hygrothermal (moisture risk) evaluation;
• a copy of the third-party product certificate (BBA or Kiwa); and
• the installer's details and credentials, plus any guarantees or warranties.

If you don't have these, the government suggests contacting the installer or manufacturer, who may be able to provide them retrospectively. If a competent surveyor confirms the installation meets the standards and manufacturer guidance, it is likely to be considered low risk with no further action needed. If not, the surveyor may recommend remedial work, removal of the foam, removal of quilt insulation, or re-roofing.

Choosing an independent assessor

The joint guidance recommends checking that your assessor:

• is a member of an appropriate body such as the PCA, RPSA, RICS or CABE;
• is familiar with the March 2023 inspection protocol;
• has professional indemnity insurance; and
• has relevant experience and no undeclared commercial interest – for example, an assessor who also profits from doing the removal should say so up front.

The PCA has a find a specialist tool. In 2026 it also began consulting on a membership scheme and standards for spray foam removal contractors, because it was hearing worrying reports about advice, sales practices and prices in the removal sector.

If your foam was installed under a government scheme

Installations under government schemes since 2020 must be done by TrustMark-registered installers. If yours was fitted less than 6 years ago and the installer is still trading, you can use the TrustMark dispute process. If the installer has stopped trading, contact your insurance-backed guarantee provider – these typically last up to 10 years.

How we can help

We can introduce you to independent assessors and, if removal is recommended, to removal specialists who provide itemised quotes and post-removal documentation. Tell us your deadline and your lender, if you know it.