Key Takeaways
- NatWest and RBS share the same parent group (NatWest Group) and apply broadly consistent lending criteria on spray foam.
- Both are listed among lenders that restrict or decline applications involving foam on roof timbers (as of June 2026).
- The core issue is the surveyor-access barrier, consistent with all mainstream lenders.
- A PCA-protocol inspection or removal certificate may resolve the issue — verify current NatWest criteria with a specialist broker.
- A specialist mortgage broker is the most efficient way to navigate this landscape.
NatWest and RBS: Are Their Policies the Same?
NatWest and Royal Bank of Scotland are both brands operated by NatWest Group plc. They typically operate under shared underwriting criteria, which means spray foam policy for one is generally aligned with the other. However, operational differences can exist, and criteria can evolve. Before making any assumption, verify the current position for both brands through a specialist mortgage broker or directly with the lender.
As of June 2026, both appear on industry lists — compiled by the Homeowners Alliance and referenced in BBC coverage — of lenders that restrict or decline lending on spray-foam-affected properties. This is consistent with the behaviour of the majority of mainstream UK mortgage providers.
The Impact on Your Application
Whether you are buying, selling, or remortgaging, the presence of spray foam on the roof structure will be flagged in the surveyor’s report. NatWest Group lenders then apply their lending criteria, which — for spray-foam-affected properties — currently result in restriction or refusal in most cases.
Buyers using NatWest or RBS financing on a foam property should expect the application to be held pending resolution of the foam issue — either through a PCA inspection that the lender finds acceptable, or through removal and an RICS certificate.
Sellers whose property has foam should be aware that NatWest and RBS mortgage borrowers — a substantial portion of the market — will face difficulties. Providing documentation (inspection report or removal certificate) is the seller’s most effective way to protect the sale.
Remortgagers staying with NatWest may have options through a product transfer that avoids triggering a full new valuation; speak to a NatWest adviser or broker to understand what is available without first resolving the foam.
The Inspection and Certificate Route
Independent PCA-protocol inspection. A surveyor on the PCA Spray Foam Inspection register produces a standardised report documenting foam type, installation quality, timber condition and ventilation. A low-risk outcome from this inspection is the first piece of documentation that a broker can present to a lender to explore whether an application might proceed.
Some lenders in the NatWest Group may, in low-risk cases, consider proceeding with an inspection report in hand. A specialist broker will know whether this is currently the case and how to structure the application. Do not apply directly without broker guidance.
Professional removal and RICS certificate. If NatWest or RBS requires it — or if the inspection reveals significant risk — professional removal followed by an independent RICS-verified certificate resolves the issue definitively. The certificate confirms the foam has been fully removed and the roof is sound. At that point, the property is treated as standard.
The Bottom Line
NatWest and RBS share the mainstream lender position on spray foam: if surveyors cannot inspect the timbers, applications are restricted or declined. This is solvable — an independent inspection, a specialist broker, and where necessary, professional removal and RICS certification put you back on track.
Book a spray foam inspection or request a removal quote.
Related reading: Barclays, HSBC & Santander spray foam policies · Mortgage declined due to spray foam? Your next steps · Spray foam removal certificate: what it proves