Commercial Mortgages: A Complete Guide for UK Business Owners
Mark Grant
Relationship Manager · Mar 10, 2026 · 10 min read
A commercial mortgage is a long-term loan secured against commercial property, used either to purchase business premises or to release equity from property the business already owns. For UK businesses that can qualify, commercial mortgages offer some of the lowest interest rates available in the business finance market and terms of up to 25 years.
Types of commercial mortgage
Owner-occupied commercial mortgages are used by businesses to purchase the premises they operate from: offices, warehouses, retail units, industrial units, and light industrial premises. The business is both the mortgage borrower and the occupier. Rates are typically at their most competitive for owner-occupied properties because the lender's primary risk is the creditworthiness of the trading business, which is also the source of the debt service.
Commercial investment mortgages (also called commercial buy-to-let) are used by investors to finance commercial properties that are let to third-party tenants. Assessment focuses more on the rental income and the quality of the tenant than on the investor's own trading performance. LTVs are typically slightly lower than owner-occupied (65-70 percent vs 70-75 percent) and rates may differ depending on the tenant quality.
LTV, rates, and what to expect
Commercial mortgage LTVs are typically 65-75 percent for owner-occupied properties and 60-70 percent for investment properties. On a 500,000 pound commercial property, a 70 percent LTV mortgage provides 350,000 pounds of funding, with the borrower providing 150,000 pounds as equity. LTVs above 75 percent are rare and typically only available through specialist lenders at higher rates.
Commercial mortgage rates in 2026 are typically priced at Bank of England base rate plus a lender margin of 1.5-4 percent, depending on the LTV, property type, lease terms, tenant quality, and borrower profile. For a strong owner-occupier with clean credit and a stable trading history, total rates of 5-7 percent APR are achievable. Investment properties with shorter leases or weaker tenants attract higher margins.
"A commercial mortgage at 5-6 percent APR over 20 years is one of the cheapest forms of capital a UK business can access. For businesses with property or planning to buy premises, the rate comparison with other forms of finance is compelling."
- Mark Grant, Relationship Manager, Spark Finance
What lenders assess
For owner-occupied commercial mortgages, the primary assessment is the business's ability to service the mortgage from trading income. Lenders apply an interest coverage ratio (ICR), typically requiring that the business's annual profit before interest is 125-150 percent of the annual mortgage interest. They also assess the property itself: location, condition, lease status, planning use, and market value via a RICS valuation.
For investment mortgages, the rental income coverage of the mortgage interest is the primary assessment (ICR of 125-150 percent of gross rent against annual mortgage interest), supplemented by tenant quality (the lease length, tenant covenant strength, and break options), the property's condition and marketability, and the borrower's overall financial position.
The application process
Commercial mortgage applications require a formal RICS valuation of the property (instructed and paid for by the borrower, typically 500-2,000 pounds depending on property size and type), a solicitor for both the lender and the borrower to handle legal due diligence and Land Registry charges, the standard business financial documentation, and the property details (title documents, lease details, planning history).
Total timescales from application to completion are typically 4-8 weeks for straightforward transactions. More complex properties (multiple tenants, development potential, planning restrictions, title issues) can take longer. Using a broker who has established relationships with commercial mortgage lenders and can co-ordinate valuers, solicitors, and lender underwriters typically reduces the overall timeline.
The bottom line
Spark Finance arranges commercial mortgages for owner-occupied and investment properties, working with specialist lenders and co-ordinating the full process from application to completion. Apply at apply.sparkfinance.co.uk to discuss your commercial property finance requirements.
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