Why Spray Foam Has Become a Common Survey Finding

Spray polyurethane foam was used as an affordable retrofit insulation for loft spaces, especially in older homes with limited headroom. Government energy efficiency schemes including ECO4 and the Great British Insulation Scheme funded installations across many properties.

The appeal was genuine: it insulates quickly and covers irregular surfaces. The problem is what happens to the roof structure underneath. Research by the Property Care Association (PCA) and HomeOwners Alliance found evidence of defects attributable to spray foam in around 35% of properties they assessed. The PCA published a Sprayed Foam Insulation Inspection Protocol in March 2023 to give surveyors and lenders a clearer framework — but even this requires access to areas often physically sealed by foam.

What a Level 2 or Level 3 Survey Can and Cannot Inspect

A RICS Level 2 Homebuyer Survey and a RICS Level 3 Building Survey both include an inspection of the roof space from a loft hatch. Surveyors use a torch, moisture meter, and professional judgement to assess structure, coverings, and signs of water ingress or timber decay.

With spray foam in place, that picture changes significantly:

• Roof timbers cannot be probed or tested — they are bonded to or obscured by the foam
• Moisture readings cannot be taken through the foam — the meter cannot reach the timber surface
• Signs of rot, woodworm, or fungal growth beneath the foam are invisible
• Fixings and nail plates are concealed — trussed rafter connections cannot be verified
• Roof covering condition from inside may be obscured — felt or sarking is often sealed beneath foam

How Surveyors Report Spray Foam — The Condition Rating Question

RICS guidance updated in 2022 instructs surveyors to flag spray foam as a material concern requiring further investigation. This typically means one of two outcomes in your report:

• A Condition Rating 3 (requiring urgent or significant attention) on the roof structure — not because there is confirmed damage but because the condition cannot be verified
• Or a further investigation recommendation, asking you to commission a specialist before exchanging contracts

A Condition Rating 3 on a roof with spray foam does not automatically mean the roof is failing — it means the surveyor cannot confirm it is sound. A RICS Level 3 Building Survey from Blue Blossom will give you the most detailed account of what can be seen and a clear recommendation on next steps.

The Mortgage Problem Is Separate from Your Survey

In November 2024, the BBC reported that around a quarter of the UK’s biggest mortgage providers — and all equity release lenders surveyed — would not lend on homes with spray foam in the roof. Lenders including Halifax, Barclays, and Nationwide have tightened their policies as awareness has grown.

Your surveyor’s job is to report what can be inspected and flag what cannot. Your lender’s job is to decide whether the property provides adequate security for their loan. In practice:

• Your surveyor flags spray foam and notes inspection limitations
• Your lender applies its own policy — which may mean requesting a specialist survey, declining to lend, or requiring removal before completion
• Your lender’s valuer also makes their own independent assessment

If you are concerned about whether your lender accepts spray foam, check with your mortgage broker before commissioning a survey — that way you can factor the answer into your decision about whether to proceed with an offer.

What to Do If Spray Foam Appears in Your Survey Report

If your RICS Level 2 or Level 3 survey flags spray foam, there are several clear next steps:

• Check your lender’s position — confirm whether they will lend, and under what conditions
• Commission a specialist spray foam survey if your lender requires it — following the PCA 2023 protocol
• Get a removal quote — according to Checkatrade, removal from a typical three-bedroom property costs around £3,200 (range: £2,500–£6,000 depending on foam type and access)
• Use this as a negotiating point — the cost of removal is a legitimate basis for renegotiating the purchase price; our guide to negotiating after a survey covers how to approach this

For a comprehensive view of what issues surveyors flag alongside spray foam, see also our guide on house survey red flags and what the Level 3 survey checks in the roof and loft.