UK Mortgage Lenders Refusing Spray Foam Insulation (2026 List)
An up-to-date overview of which UK lenders are restricting or declining mortgages on properties with spray foam insulation.
Lenders that generally decline spray foam
Lender policies change. The list below reflects publicly stated underwriting positions and broker feedback as of early 2026. Always confirm directly with your lender before making decisions.
| Lender | Position | Notes |
|---|---|---|
| Halifax | Decline | Removal required in nearly all cases |
| Nationwide BS | Decline | Long-standing restriction |
| NatWest / RBS | Decline / case-by-case | Surveyor discretion |
| Santander | Decline | Documentation rarely accepted |
| HSBC / First Direct | Decline | Removal required |
| Barclays | Restricted | Surveyor report key |
| Skipton BS | Restricted | Removal usually required |
| Yorkshire BS | Restricted | Case-by-case basis |
| Coventry BS | Restricted | Strong documentation required |
Why so many lenders take this position
Banks are required by the PRA to lend prudently against UK residential property. When a material proportion of homes with retrofitted spray foam are showing valuation problems, the simplest underwriting decision is to exclude the category. It is not personal — it's portfolio risk management.
What this means for you
- Multiple declined applications damage your credit profile — get advice first.
- Removal returns you to the full mainstream lender market in nearly all cases.
- A broker who specialises in spray foam cases can save weeks of trial and error.
Frequently asked questions
Do lender positions ever soften?＋
Occasionally yes for specific products, but the overall direction since 2022 has been tighter, not looser.
Are second-charge lenders any easier?＋
Some are more flexible but rates are significantly higher and the loans are typically short-term.
What about buy-to-let lenders?＋
BTL underwriting is similar — most decline spray foam. A few specialist BTL lenders consider open-cell with documentation.