Semi-commercial property occupies the middle ground between residential buy-to-let and pure commercial investment. The classic example is a high street shop with a flat above, but the category extends to buildings with any mix of commercial and residential use on a single title. Mainstream residential and commercial lenders both typically decline these properties, meaning the specialist market handles the majority of semi-commercial mortgage applications.
What qualifies as semi-commercial
Lender definitions vary, but the general test is any single-title property with both residential and commercial elements where neither dominates entirely. Shop with a flat above. Office building with caretaker accommodation. Public house with residential landlord accommodation. Bed and breakfast with owner living quarters. Mixed-use developments with retail below and apartments above. Each of these sits in semi-commercial territory rather than being cleanly residential or cleanly commercial.
The percentage split between residential and commercial matters significantly. Lenders typically require the residential component to be no more than 40% to 60% of total floor area or rental value to treat a property as semi-commercial. Properties with 70%+ residential content may be treated as multi-unit residential (with commercial as an ancillary), while those with 70%+ commercial content sit in standard commercial mortgage territory.
LTV, rates, and typical structuring
Semi-commercial mortgages typically top out at 60% to 70% LTV. Specialist lenders (Together, InterBay, Shawbrook, Cambridge and Counties, Foundation Home Loans, Landbay Commercial) dominate this market. Rates typically sit 0.5% to 1.5% above equivalent LTV pure commercial mortgages, reflecting the additional complexity and the narrower lender pool. Two-year and five-year fixes are widely available, with five-year fixes typically supporting higher borrowing amounts due to gentler stress testing.
Assessment considers both the commercial rental income and residential rental income separately, then aggregates them for affordability. Commercial rent is typically weighted more conservatively than residential rent because commercial tenants have shorter lease terms and higher void risk. A property with £30,000 combined rental (£18,000 commercial, £12,000 residential) often supports less borrowing than a pure residential HMO with equivalent gross rent, reflecting the commercial income treatment.
Common structuring considerations
Existing tenants matter significantly. A shop let to a national retailer on a 10-year lease with 6 years remaining is treated very differently from a shop let to an independent business on a 3-year rolling lease. Vacant possession on the commercial element usually reduces loan-to-value further and increases pricing. Investors purchasing semi-commercial property with a vacant commercial unit should budget for lower LTV than the marketed maximum until a tenant is in place.
MEES (Minimum Energy Efficiency Standards) apply to the commercial element under different rules from the residential element. Since April 2023, commercial properties cannot be let with an EPC below E without an exemption, with proposals for further tightening to C by 2027 or 2028. This affects both the ability to let the commercial component and the lender’s view of the security. Older mixed-use buildings without recent EPC upgrades increasingly face MEES-related mortgage complications.
AM Commercial Finance arranges semi-commercial mortgages across the specialist market. To discuss a mixed-use property purchase or refinance, phone 01604 552100 (Monday to Friday, 9am to 6pm) or email info@amcommercialfinance.com.
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