Last reviewed: 27 August 2026.
No, spray foam insulation is not officially banned in the UK. There is no government legislation prohibiting its installation. However, it has become much harder to live with, because only around 25% of UK mortgage lenders will lend against a property where it has been retrofitted — and equity release options are currently very limited (see the exceptions noted in our lender guide). That leaves a quarter of the market open to you, and which side of the line you fall on usually comes down to the evidence you can produce about the installation, and several government retrofit schemes no longer support it.
Is Spray Foam Insulation Illegal in the UK?
No. Installing spray foam insulation remains legal in England, Scotland and Wales. There is no outright ban, and it is not classified as a banned or restricted building material. The confusion around “banned” status comes from the practical difficulty of selling, remortgaging or insuring a property once spray foam has been installed, rather than from any change in the law.
Why Spray Foam Is Effectively Banned by Lenders
That leaves most mainstream lenders unwilling to lend against a home with retrofitted spray foam in the roof without conditions attached — commonly a full removal, or a specialist evidence report about the installation, before they will proceed. Lenders including Halifax, Nationwide, TSB, NatWest, Santander, Yorkshire Building Society, Barclays, HSBC, Virgin Money and Bank of Scotland assess spray foam case by case. All of them have declined applications where the surveyor could not inspect the roof or the documentation was missing — particularly where closed-cell foam has been sprayed directly onto roof timbers — and the same lenders will lend where the evidence is provided. See the lender-by-lender table for each position. Surveyors flag the foam because it prevents them from inspecting the timbers underneath for rot, damp or structural damage.
Talk it through with a free, independent adviser — no obligation, and we carry out no removals ourselves.
Government Schemes Have Moved Away From Spray Foam
Spray foam insulation was previously eligible for support under the Green Homes Grant, which closed in March 2022. It has since been excluded from the government’s Great British Insulation Scheme, reflecting growing concern among surveyors, lenders and industry bodies about ventilation, moisture and long-term timber damage. This shift in government policy has reinforced the caution already shown by mortgage lenders and insurers.
What This Means If You’re Selling, Buying or Remortgaging
Even though spray foam insulation is not illegal, its presence can stall or collapse a house sale, block a remortgage, or trigger a request for costly removal before a lender will proceed. If you’re planning to sell, remortgage, or you’re a buyer who has just discovered spray foam during a survey, it is worth getting independent advice before you commit to removal or walk away from a transaction.
Frequently Asked Questions
Can I get a mortgage with spray foam insulation?
It’s possible, but harder. Some lenders will proceed with a satisfactory evidence report or after removal; others will decline outright regardless of the report.
Will spray foam insulation be banned outright in future?
There’s no indication of an outright legal ban, but continued exclusion from government schemes and growing lender caution suggests the practical barriers will remain, or increase.
The National Spray Foam Advisory provides free, independent guidance to UK homeowners affected by spray foam insulation, and can connect you with vetted loft spray foam removal companies where removal is the right option, and help you compare loft spray foam removal quotes so you know a fair price when you see one. Get in touch to discuss your situation.
Related guides: Which lenders accept spray foam? · What a flagged survey really means · Can I remortgage with spray foam? · Do I need to remove it at all?
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.