UK Commercial Mortgages: Rates, Deposit Requirements & Lending Criteria Guide

A commercial mortgage is a long-term loan secured against real estate that is not classified as a standard residential dwelling. In the UK, commercial mortgages fund the acquisition, refinancing, or equity release of commercial premises ranging from offices, industrial units, and warehouses to retail high-street shops, hospitality venues, and mixed-use commercial properties.

Unlike residential mortgages, which are highly standardized and strictly regulated by the Financial Conduct Authority (FCA), commercial mortgages are largely unregulated commercial agreements. Every transaction is individually underwritten based on property asset quality, lease covenants, and borrower financial standing, offering greater flexibility in structuring loan terms, repayment profiles, and covenant headroom.

Commercial mortgage underwriting divides into two core categories, each evaluated against different financial metrics:

Owner-Occupier Commercial Mortgages: The property is acquired or refinanced by a trading business to conduct its own operations (e.g., a manufacturing firm buying its workshop or a dental practice buying its surgery). Repayments are serviced directly from the trading profits of the business. Lenders scrutinize historical EBITDA, management accounts, and operational viability.

Commercial Investment Mortgages: The property is acquired by an investor or property company to let to third-party commercial tenants. Repayments are serviced from contractual rental income. Underwriters focus on tenant covenant strength, Weighted Average Unexpired Lease Term (WAULT), and the commercial viability of the location.

Commercial mortgages require significantly higher equity contributions than residential borrowing, with lenders capping Loan-to-Value (LTV) ratios to maintain safety margins against property market fluctuations:

Owner-Occupier LTV: Lenders routinely advance between 70% and 75% of the property's Open Market Value (OMV), meaning the business must supply a 25% to 30% cash deposit. In specialized sectors (such as healthcare, veterinary, or accountancy practices), select lenders may consider up to 80% LTV.

Commercial Investment LTV: LTV caps for commercial investment property typically range from 60% to 70%. High-risk or single-tenant assets with short remaining lease terms may be restricted to 50% to 60% LTV.

100% Commercial Mortgages: While 100% LTV commercial mortgages against a single asset do not exist, borrowers can achieve 100% funding by providing additional security (cross-collateralisation) over other unencumbered commercial or residential property.

Commercial mortgage pricing is structured as a lender margin over a benchmark base rate, rather than an off-the-shelf headline rate:

Variable Rates: Typically quoted as Bank of England Base Rate plus a lender margin of 2.25% to 4.50%, or SONIA (Sterling Overnight Index Average) plus margin. Monthly repayments fluctuate with national monetary policy decisions.

Fixed Rates: Available for terms of 2, 3, 5, or 10 years, offering budgetary certainty by locking in interest costs, though early repayment charges (ERCs) apply if redeemed during the fixed period.

Arrangement and Valuation Fees: Expect a lender arrangement fee of 1.0% to 2.0% of the loan size, an independent RICS Red Book commercial valuation fee (dependent on property complexity), and dual legal representation costs for both the lender's and borrower's solicitors.

To approve a commercial mortgage, credit underwriters model cash flow adequacy through strict financial coverage tests:

Debt Service Coverage Ratio (DSCR): For owner-occupier borrowing, annual trading EBITDA must cover annual debt repayments by at least 1.25x to 1.35x. Lenders often stress-test repayments at a hypothetical interest rate 2% to 3% above current pricing.

Interest Cover Ratio (ICR): For commercial investment properties, annual net rental income must cover annual interest commitments by 130% to 150%. Underwriters verify tenant lease terms, lease break clauses, and whether service charges and insurance are fully recoverable.

Purchasing commercial premises offers distinct strategic and fiscal benefits when structured appropriately:

Mortgage vs Rent: Owning commercial premises eliminates landlord rent reviews, prevents eviction risks, and allows the company to build balance-sheet equity rather than paying dead money in commercial rent.

Purchasing via a Pension (SIPP or SSAS): UK business owners can use a Self-Invested Personal Pension (SIPP) or Small Self-Administered Scheme (SSAS) to acquire commercial property. The pension purchases the property, leases it back to the trading company at market rent, and all rental income and capital gains grow completely free of UK income tax and capital gains tax (CGT).