Commercial mortgages: a UK SME owner's guide

For a UK SME that has been paying rent for years, the moment of buying its own premises is often the single biggest financial decision the directors make. A well-structured commercial mortgage can reduce occupancy costs, build equity in the business, and provide long-term security against landlord whim. A badly-structured one ties up capital, restricts growth and creates concentration risk in property at exactly the wrong point in a cycle. This guide sets out how commercial mortgages work, what UK lenders look at, and the practical decisions involved.

Owner-occupier vs investment

There are two main use cases for a commercial mortgage:

• Owner-occupier: the business buys the property it trades from. The mortgage is repaid from the business's trading cashflow. Typical LTV 65 to 75 per cent, term 15 to 25 years.
• Investment: the borrower buys a commercial property to let out to a third-party tenant. The mortgage is repaid from rental income. Typical LTV 65 to 70 per cent, term 15 to 25 years. Underwriting focuses on rental cover (the rent comfortably exceeding the mortgage payment).

How pricing works

Commercial mortgage rates are usually expressed as a margin over Bank of England base rate or SONIA, with the option to fix for 2, 3, 5 or sometimes 10 years. As of 2026, prime owner-occupier deals price at around 6 to 8.5 per cent all-in for established businesses; investment deals are usually slightly higher. Margins are wider for shorter trading history, harder property types, and adverse credit. Arrangement fees of 1 to 2 per cent are standard.

UK commercial mortgage lenders

The market splits into three layers:

High-street and challenger banks

NatWest, Lloyds Bank, Santander, Metro Bank, Allica Bank, Shawbrook and Redwood Bank. These lenders offer competitive rates for clean owner-occupier and investment deals on standard property. Underwriting is conservative — 2 to 3 years of accounts, clean credit, mainstream property type — but pricing is the best in the market.

Specialist commercial lenders

Together, Hampshire Trust Bank, United Trust Bank, West One. More flexible on property type, credit history, trading length and unusual structures. Higher rates than the high-street group but accessible to deals the high-street will not write.

Islamic banks

Al Rayan Bank, Gatehouse Bank, ADIB UK, BLME. Sharia-compliant commercial property finance — see our Islamic finance guide for the structures.

What lenders weigh

1. Property quality: location, condition, lettability and saleability. Town-centre retail in declining high streets is harder than industrial units near motorway junctions.
2. Property type: standard offices, light industrial, warehouse and standard retail are easier. Specialist property (petrol stations, care homes, hotels, leisure) requires specialist lenders.
3. LTV and deposit: minimum 25 to 35 per cent deposit on most cases.
4. Income cover: for owner-occupiers, the business's EBITDA should cover the mortgage payment by at least 1.4 to 1.5 times. For investment, rental cover of 130 to 160 per cent of payment.
5. Trading history: typically 3 years of accounts for owner-occupied, 2 to 3 years for investment.
6. Director profile: clean personal credit, asset and liability statement, source of deposit funds.
7. Lease length and tenant strength on investment property.

Owner-occupier: the key affordability question

If the business is buying its own premises, the central question is whether the EBITDA comfortably covers the mortgage payment. A simple test: take the proposed monthly payment, multiply by 12, and divide last year's EBITDA by that figure. If the result is above 1.4, you are in comfortable territory. Below 1.2 and most mainstream lenders will pause. Always model the payment at 2 to 3 percentage points above current rates as a stress test.

Investment: the rental cover test

On a commercial investment mortgage, the lender will model the rent against the mortgage payment using a stressed rate (typically 2 to 3 percentage points above current rates). The rental income, after a vacancy and management allowance, must cover the stressed payment by at least 130 per cent. A property with a strong long-lease tenant (a national chain on a 10-year lease, for example) gets better terms than the same property let to an unrated SME on a rolling tenancy.

The application process

1. Decision in principle from the lender — typically 1 to 5 days based on the headline numbers.
2. Full application with documents — see the document checklist below.
3. Valuation instructed (RICS Red Book report). The borrower pays for the valuation.
4. Legal due diligence by the lender's solicitors and your own conveyancer.
5. Offer letter — formal lending offer subject to legal completion.
6. Completion — funds released, charge registered against the property.
7. Total timeline: 6 to 12 weeks for a clean case, longer for complex property or unusual ownership structures.

Document pack for commercial mortgages

• 3 years of filed accounts plus year-to-date management accounts.
• Last 4 quarters of VAT returns.
• 6 months of business bank statements and 3 months of personal bank statements for each director.
• Asset and liability statement for each director.
• Director ID and proof of address.
• Source of deposit evidence — savings, equity from another property, business retained profits.
• Property details: full sale memorandum, EPC, planning history.
• On investment property: tenancy agreements, schedule of leases, rent demand history.
• On owner-occupied: a brief business plan explaining the rationale for the purchase.

Common pitfalls

• Choosing a 5-year fix without modelling refinance options at the end of term. The exit matters.
• Buying a property with weak lease terms or a tenant in trouble — the rental assumptions disappear at the next break clause.
• Not budgeting for stamp duty (commercial SDLT applies), legal fees, valuation, broker fees and a refurbishment contingency.
• Underestimating the time required — 8 to 10 weeks is typical, not 4.
• Buying with the trading company rather than a separate property SPV. Tax and legal advice on the structure is worth far more than its cost.

When to use bridging instead

If your timeline is tight (auction, 28-day completion), the property is uninhabitable or needs significant work before it can be re-let or re-traded from, or your trading history is below the commercial mortgage threshold, a bridging loan is the right shape. Bridge in fast, complete the works or stabilise the trade, then refinance onto a long-term commercial mortgage. The combined cost of a 6-month bridge and a subsequent commercial mortgage often comes out cheaper than waiting 4 months to align a commercial mortgage with the purchase date.

A practical example

A retained-search recruitment firm based in Bristol, three years trading, £1.2m turnover and £180k EBITDA, decided to buy the office they were renting. The asking price was £750,000. They contributed £200,000 of deposit (retained profits plus directors' personal savings), took a £550,000 mortgage from Allica Bank on a 5-year fix at 7.4 per cent over 20 years. The monthly payment came in at around £4,400 — comfortably covered by their previous rent of £4,200 plus the small saving in service charge. Stamp duty and legal fees added £35,000 to the cost. The deal completed in 9 weeks. Five years later, the property is on their balance sheet and their cost of occupancy is lower than continuing to rent would have been.