At AF Credit, we specialise in helping buyers purchase properties that mainstream lenders struggle to finance — including BISF houses, steel-framed properties, non-standard construction homes, PRC houses, timber frame properties and other mortgage-restricted assets.
Yes, but it depends on the construction type. Many lenders will lend on certain steel-framed properties — particularly BISF houses — where the property is structurally sound and the surveyor considers it readily marketable. Other systems attract greater scrutiny and may result in a decline. Where a mainstream lender declines, bridging finance can often complete the purchase where a clear exit strategy exists.
What Is a Steel Frame House?
A steel frame house uses a steel structural skeleton — rather than traditional masonry walls — to support the building's load. External walls may be formed using brick cladding, render systems, concrete panels or composite materials. Many steel-framed homes were constructed after the Second World War to help address housing shortages across the UK.
Types of Steel Frame Construction
British Iron and Steel Federation houses are among the most widely recognised steel-framed property types. Many lenders will consider BISF houses subject to valuation and condition. BISF houses are bought and sold with conventional mortgages every year.
Atholl steel-framed properties may attract varying lender attitudes depending on condition and location. Individual underwriting is often required and some lenders may decline on policy grounds.
Trusteel properties are another form of steel-framed construction that may require additional lender assessment. Lender appetite varies and structural condition is a key consideration.
Numerous steel-based construction systems were used throughout the 20th century. Each attracts different lender responses — some are widely accepted, others are consistently declined regardless of condition.
Why Do Mortgage Lenders Decline Steel Frame Houses?
Lenders use the property as security for their loan. Concerns about steel-framed construction typically relate to the potential for frame corrosion over time, structural deterioration, future repair requirements, limited buyer demand and long-term resale risk. The specific construction system matters as much as the fact that steel is present — BISF properties attract very different lender responses to other steel-framed systems.
What Happens if a Survey Identifies Steel Frame Construction?
The lender may request additional information, refer the case for specialist underwriting, require structural reports, restrict lending or decline the mortgage. This can be particularly frustrating where buyers were unaware of the construction type before making an offer — steel frames are typically concealed behind external cladding and are not visible to the eye.
- BISF construction in good condition
- Structurally sound with no active deterioration
- Strong local comparables
- Surveyor comments are broadly positive
- Less common steel frame systems
- Structural deterioration or frame corrosion
- Surveyor raises specific concerns
- Lender has blanket policy restriction
How AF Credit Can Help
AF Credit specialises in financing properties that mainstream lenders decline. We regularly assist buyers purchasing BISF houses, steel-framed properties, non-standard construction homes and auction properties. Where there is a realistic refinance route and clear exit strategy, we can often provide bridging finance to facilitate the purchase.
Using Bridging Finance for a Steel Frame Purchase
Identify the specific steel frame system — BISF, Atholl, Trusteel or other. This determines which lenders may refinance and what structural information is needed.
A specialist mortgage broker identifies a lender whose criteria accept the construction type. AF Credit focuses on the exit from day one — the bridge is a means to a mortgage, not a long-term solution.
AF Credit reviews the property, construction details and exit strategy. We can consider residential bridging where the transaction stacks up and a credible exit is in place.
The bridging loan funds the purchase. Refinancing onto a suitable mortgage is then arranged and the bridge repaid — leaving the buyer with long-term finance in place.
Example
A buyer agrees to purchase a BISF property for £190,000. The lender's valuation identifies steel frame construction. The lender declines the application due to its policy on non-standard construction.
AF Credit provides bridging finance to complete the purchase.
A specialist mortgage broker identifies a lender whose criteria accept BISF properties. The bridge is repaid on refinancing — leaving the buyer with a long-term mortgage in place.
Why Investors Buy Steel Frame Houses
Properties affected by lender restrictions often attract fewer buyers — reducing competition and creating pricing opportunities. For experienced investors, steel-framed houses can represent below-market-value entry points where the underlying accommodation and location are strong. The reduction in buyer pool created by mortgage restrictions is the same mechanism that creates the opportunity for buyers who can access specialist finance.
Frequently Asked Questions
Can you get a mortgage on a steel frame house?
Yes. Many lenders will lend on certain steel-framed properties depending on construction type and condition. See our non-standard construction guide for a broader overview.
Are BISF houses mortgageable?
Often yes. BISF houses are among the more mortgageable steel-framed property types and many are sold with conventional mortgages every year. Individual lender criteria vary and surveyor comments remain important.
Are steel frame houses non-standard construction?
Most steel-framed properties are considered non-standard construction. The extent of lender restrictions varies significantly between construction systems.
Why was my mortgage declined on a steel frame property?
Common reasons include lender policy on the specific construction type, surveyor concerns about corrosion or deterioration, or marketability concerns. A decline from one lender does not mean all lenders will decline.
Can I buy a steel frame property at auction?
Yes. Steel-framed properties frequently appear at auction. Bridging finance is commonly used where traditional mortgage finance is unavailable, with refinancing arranged after purchase. See our auction finance guide for more detail.
Does AF Credit lend on steel frame houses?
Yes. AF Credit specialises in financing properties that mainstream lenders decline — including BISF houses, steel-framed and other non-standard construction properties. Where there is a realistic exit strategy, we can often consider bridging finance.
If your mortgage has been declined because of steel frame construction, or you are considering purchasing a steel-framed property with limited mortgage options, AF Credit may be able to help. Where there is a realistic exit strategy and refinance route, we can often provide bridging finance to help you complete the purchase.
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