Answers · UK 2025/26
What is a commercial mortgage?
A commercial mortgage is a loan secured against a non-residential property, such as an office, shop, warehouse, or a mixed-use building, typically used by businesses to buy their own trading premises or by investors to buy commercial property to let out. Commercial mortgages usually require larger deposits, carry higher interest rates than residential mortgages, and are individually underwritten based on the business or investment case rather than standard residential affordability criteria.
Full answer
Commercial mortgages serve businesses and property investors looking to finance non-residential property, and they work quite differently from the residential and buy-to-let mortgages most people are familiar with. **What counts as a commercial mortgage** Commercial mortgages cover a wide range of property types: offices, retail units, warehouses, industrial premises, restaurants and pubs, and mixed-use buildings (such as a shop with a flat above). They are used both by owner-occupier businesses buying their own trading premises, and by investors buying commercial property purely to let out to tenants. **How lending criteria differ from residential mortgages** Unlike residential mortgages, which follow relatively standardised affordability rules, commercial mortgages are individually underwritten, taking into account the specific business's trading history and finances (for owner-occupiers) or the property's rental income and tenant covenant strength (for investment purchases). This means terms, rates, and required documentation vary much more from case to case than with a typical residential mortgage. **Deposit requirements** Commercial mortgages typically require a larger deposit than residential mortgages -- often 25% to 40% of the property's value, though this varies considerably depending on the type of property, the strength of the business or tenant, and the lender's specific risk appetite for that sector. **Interest rates and terms** Commercial mortgage interest rates are generally higher than residential mortgage rates, reflecting the higher perceived risk and the more bespoke underwriting involved -- terms can range from a few years up to 25 years or more, and both fixed and variable rate options are typically available, though the market is less standardised than residential mortgages. **Owner-occupier versus investment commercial mortgages** An owner-occupier commercial mortgage is assessed largely on the trading business's accounts, profitability, and ability to service the debt from its own operations. An investment commercial mortgage (buying to let to a tenant business) is assessed more like a commercial buy-to-let, based on the rental income the property can generate relative to the mortgage repayments. **Worked example** A growing business currently renting its premises decides to buy its own warehouse for £500,000. It arranges a commercial mortgage requiring a 30% deposit (£150,000), with the lender assessing the business's trading accounts and profitability to determine affordability for the remaining £350,000 loan. **Practical tip** Because commercial mortgages are individually underwritten and less standardised than residential products, using a commercial mortgage broker with experience in your specific property type or sector can significantly improve your chances of securing competitive terms.
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This answer is informational only and does not constitute financial, tax or legal advice. Figures are for the 2025/26 UK tax year. See our methodology and sources.