Semi-commercial property – a shop with a flat above, a pub with living accommodation, a surgery with a residential unit – sits between two lending markets. Residential lenders often will not touch it, and some commercial lenders treat it as a lower-risk cousin of pure commercial. Understanding how it is underwritten helps borrowers choose the right lender first time and avoid wasted valuation fees.
What counts as semi-commercial?
A property is generally treated as semi-commercial (or mixed-use) where it contains both a commercial element, such as retail, office or leisure space, and a residential element. Lenders will look at the proportion of each, whether the units can be sold or let separately, and whether the residential part is occupied by the borrower or let to a tenant. The split matters: a building that is predominantly residential may be priced and assessed differently from one that is predominantly commercial.
How lenders assess owner-occupied and investment cases
Where the borrower trades from the commercial unit, lenders assess the trading business, usually through two to three years of accounts, alongside the property. Where the property is let, the focus moves to rental income, tenant quality and lease terms. In both cases the lender will commission its own valuation, and loan-to-value is calculated on that figure, not the price paid. For more on how LTV is set across property types, see our guide to commercial mortgage loan-to-value in 2026.
Interest rate and affordability
The Bank of England held Bank Rate at 3.75% at its September 2026 meeting, and commercial pricing is set by individual lenders’ funding costs and risk appetite rather than following Bank Rate one-for-one. Lenders typically test that income comfortably covers the interest, and the margin they require varies by lender and property type. If you are refinancing an existing facility, our article on refinancing a commercial mortgage and how DSCR affects timing explains how that test works in practice.
Common pitfalls
- Mismatched lender appetite. Applying to a lender that does not lend on mixed-use wastes time and may leave a footprint on your credit file.
- Planning and use class issues. Unauthorised changes of use or an unclear residential consent can stall an application.
- Vacant units. An empty commercial or residential unit can reduce the loan available or require a retention.
- Insurance and condition. Surveyors may flag fire safety, asbestos or structural matters that affect the offer.
Getting the structure right
Some cases are better split across products – for instance, a short-term bridge to acquire and improve, followed by a term commercial mortgage. Our commercial mortgage service covers owner-occupier, investment and semi-commercial lending, and the Commercial & Corporate Banking Hub links to related guides. Buyers of high-street units in Barking, Dagenham and Rainham may also find our Dagenham mortgage broker page useful, or see the areas we cover.
Speak to us
If you are buying or refinancing a mixed-use building, contact Giles Finance to discuss lender options for your specific property.
Commercial and semi-commercial lending is largely unregulated by the FCA. Your property may be repossessed if you do not keep up repayments on a loan secured against it. Lending is subject to status, valuation and underwriting.
Giles Finance is a trading style of Giles Finance & Consultancy Services, authorised and regulated by the Financial Conduct Authority (FRN 726857).