Commercial Mortgage Rates Explained for UK SMEs

How commercial mortgage rates are structured

Commercial mortgage lenders set your interest rate by adding a margin to a reference rate, usually the BoE base rate (currently 4.50%) or the Sterling Overnight Index Average (SONIA). The margin reflects the lender's assessment of credit risk, property quality and loan-to-value ratio. Unlike residential mortgages, there is no standard product table published by a regulator, so rates vary considerably between lenders and are negotiated individually.

Rates can be fixed for a set term, typically two to five years, or variable, tracking the reference rate throughout the loan. Fixed rates give payment certainty and are generally favoured by businesses with tight cash-flow planning requirements. Variable rates may start lower but expose the borrower to movements in the base rate. Some lenders offer a blend: a fixed period followed by a variable tail.

Key factors that move your rate up or down

Six variables have the greatest influence on the rate a lender will offer: loan-to-value, debt-service coverage ratio, property type, lease profile, business trading history and the personal credit position of directors. Addressing each one before application is the most reliable way to secure a competitive rate.

Loan-to-value (LTV) is the single largest driver. Borrowing at 55% LTV will almost always attract a lower margin than borrowing at 70% LTV because the lender holds more security cushion. Debt-service coverage ratio (DSCR), the relationship between net operating income and annual debt service, is the second key metric: most lenders require a minimum DSCR of 1.25x. Owner-occupied commercial property is typically priced more favourably than investment property let to third parties, because the borrowing business has a direct operational incentive to maintain payments.

Fixed versus variable: which suits most SMEs

A fixed-rate commercial mortgage removes interest-rate uncertainty for the fixed term, which simplifies budgeting and protects against base rate increases; a variable-rate product offers more flexibility and may cost less if rates fall.

For most SMEs with stable turnover, a fixed rate for two to five years is the more prudent choice. It removes a financial variable from the profit and loss account and allows directors to plan capital expenditure with confidence. Early repayment charges (ERCs) on fixed products can be significant, often 1% to 3% of the outstanding balance per remaining year, so borrowers who anticipate selling the property or refinancing within the fixed period should weigh the ERC cost carefully against the certainty benefit. Variable-rate products usually carry lower or no ERCs, which suits businesses with a defined exit strategy or those expecting to trade up to a larger premises within three years.

Indicative rate ranges by property type in 2026

Different commercial property classes carry different risk profiles in the eyes of lenders, and this is reflected directly in the margin offered. Industrial and warehouse property currently attracts the keenest margins; secondary high-street retail attracts the widest.

Owner-occupied offices in established business parks typically attract margins of 2.5% to 3.5% above base rate. Light industrial and logistics units, which have seen strong occupier demand, are currently priced at 2.25% to 3.25% above base rate for strong borrowers. Retail property remains more cautiously priced, with margins of 3.0% to 4.5% above base rate reflecting ongoing structural changes in consumer behaviour. Hospitality assets such as hotels, restaurants and licensed premises attract the widest margins, often 3.5% to 5.5% above base, because revenue volatility and operational complexity increase lender risk. These are indicative ranges only; individual deals will vary.

Fees that add to the effective cost of borrowing

The headline interest rate is not the full cost of a commercial mortgage. Arrangement fees, valuation fees, legal costs and, where a broker is involved, a broker fee all contribute to the total cost of credit.

Arrangement fees are charged by the lender and typically range from 1% to 2% of the loan amount; they are often added to the facility rather than paid upfront. An independent commercial valuation is mandatory and costs between £1,500 and £5,000 depending on property size and complexity. The borrower pays the lender's legal costs as well as their own, which can add £3,000 to £8,000 in total. Broker fees, where applicable, are usually 1% to 1.5% of the loan, payable on completion. Calculating the Annual Percentage Rate (APR) inclusive of all fees gives a more accurate comparison between competing offers than the interest rate alone.

How to approach lenders and improve your pricing

Preparing a strong application pack before approaching lenders is the most effective way to demonstrate creditworthiness and negotiate a tighter margin. Lenders price risk; the more evidence you provide that risk is low, the better the terms you can expect.

Assemble three years of filed accounts, the most recent two years of business bank statements, a current rent roll or tenancy schedule if the property is let, an up-to-date schedule of assets and liabilities, and a brief business overview explaining the purpose of the purchase or refinance. If your DSCR is close to 1.25x, prepare a sensitivity analysis showing serviceability at a rate 2% higher than the quote. Engaging a specialist commercial finance broker who has panel relationships with challenger banks, regional lenders and institutional funders can broaden the market you access and, in some cases, unlock pricing not available to direct applicants.

Step-by-step

1. Calculate your target LTV by dividing the loan amount by the property's estimated market value.
2. Calculate your DSCR by dividing net operating income by total annual debt service including the new mortgage.
3. Gather three years of filed accounts, two years of bank statements and any tenancy or lease documentation.
4. Obtain an indicative valuation or desktop appraisal to confirm the security value before formal application.
5. Approach at least three lenders or use a specialist broker to obtain comparable terms on the same loan profile.
6. Compare offers on total cost of credit (APR inclusive of all fees) rather than headline interest rate alone.
7. Instruct solicitors and a RICS-registered commercial valuer once you accept a formal credit-approved offer.

Example

Frequently asked questions

By Oliver Mackman, Director, Best Business Loans Ltd. Last reviewed 2026-06-10.