Business Property Mortgage Rates: What UK Developers Pay

A business property mortgage — often called a commercial mortgage — is a loan secured against property used for business purposes. This covers owner-occupier premises (where the borrowing business trades from the property), commercial investment property (acquired to let to business tenants), and semi-commercial assets that combine retail or office space with residential units above.

Unlike a residential mortgage, a business property mortgage is assessed primarily on the financial strength of the business, the quality of the security, and the property's ability to generate income or support the borrower's trading activity. Underwriting is largely manual, meaning lenders weigh each case on its individual merits rather than applying automated scoring models.

Terms typically run from 5 to 25 years, with loan-to-value (LTV) ratios usually capped at 65% to 75% depending on the lender and property type. Repayment can be on a capital-and-interest basis or interest-only, with interest-only more common on investment deals where rental income services the loan. The loan is secured by way of a first legal charge over the commercial property, and lenders will commission a RICS Red Book valuation before funds are released.

Business property mortgages are distinct from bridging loans, which are short-term facilities used for acquisition or refurbishment before a longer-term mortgage is arranged, and from development finance, which funds ground-up construction and is drawn down in stages against build progress. Each product is priced and structured differently, so selecting the right instrument at the outset materially affects your overall cost of funds.

Business property mortgage rates in the UK are priced as a margin above the Bank of England base rate — currently 4.5% p.a. as of early 2026 — or as a fixed rate agreed for an initial term. The margin a lender charges reflects their assessment of risk: lower LTV, stronger borrower financials, and prime property all compress the margin, while higher leverage or secondary locations widen it.

The table below shows indicative rate ranges across typical LTV bands for owner-occupier and investment commercial mortgages. These figures reflect current specialist and challenger bank pricing and are illustrative of the market rather than a formal quotation.

Investment rates sit slightly above owner-occupier rates because lenders view rental income as a less certain form of debt service than a trading business's own cashflows — particularly where the commercial tenant base is concentrated or leases are short. Lenders typically require rental income to cover debt service by at least 125% to 145% on an interest coverage ratio basis, calculated at a stressed rate above the actual contracted rate.

For mixed-use semi-commercial property — such as a ground-floor retail unit with residential flats above — some lenders apply a blended rate or assess the residential and commercial elements separately. Specialist lenders frequently offer more flexible terms on semi-commercial than high-street banks, which is one reason that access to a wide lender panel produces meaningfully different outcomes than approaching one or two institutions directly.

Business property mortgages are available on fixed or variable (tracker) rate terms, and the choice materially affects both your monthly outgoings and your risk exposure across the loan term.

A fixed-rate commercial mortgage locks your interest rate for an agreed initial period — typically 2, 3, 5, or 10 years. During this period your repayments are predictable, which aids cashflow planning and supports business budgeting. The trade-off is that fixed rates are generally set slightly above equivalent variable rates to compensate the lender for the rate risk they absorb. Early repayment charges (ERCs) apply during the fixed period and can be substantial — sometimes 2% to 5% of the outstanding balance — so you need confidence that you will hold the loan to or beyond the end of the fixed term before committing.

Variable or tracker rate mortgages move in line with the Bank of England base rate plus the lender's margin. If the base rate falls, your repayments reduce accordingly; if it rises, they increase. Tracker products typically carry no ERCs or shorter ERC windows, making them suitable for borrowers who anticipate refinancing, selling the property, or repaying the loan within a few years. The risk is upward rate movement: a 1% rise in base rate on a £1M loan adds approximately £10,000 p.a. to your interest cost.

For property developers who plan to refinance onto long-term investment finance after completing a project, a short-term fixed or variable commercial mortgage is often the appropriate structure. For established owner-occupiers seeking stability in operating costs, a longer fixed term may better suit the business planning cycle. See our comparison of development finance vs bridging loans if you are evaluating short-term structured products as an alternative.

The rate you are offered on a business property mortgage is not fixed in advance — it is the output of a lender's credit assessment. Understanding the factors lenders weigh allows you to structure your application to minimise the margin they charge.

Loan-to-value ratio is the single most influential pricing variable. Lenders view LTV as the primary measure of their security position: if the borrower defaults and the property must be sold under pressure, a lower LTV provides a greater recovery buffer. Most commercial lenders cap at 70% to 75% LTV for owner-occupier and 65% to 70% for pure investment, though specialist lenders will occasionally stretch to 75% LTV on investment with strong tenant covenants. An accurate market value assessment from a RICS-qualified surveyor underpins the LTV calculation, and a disputed or conservative valuation can force the borrower into a higher rate band.

Property type and use class significantly affect pricing. Standard use classes — offices, light industrial, and retail — attract the most competitive rates. Specialist or single-purpose properties such as petrol stations, care homes, pubs, and hotels are viewed as higher risk because of limited alternative occupier demand and a restricted resale market. These assets typically command wider margins and lower maximum LTVs than mainstream commercial property.

Borrower financial strength covers the trading history, profitability, and balance sheet of the business seeking the mortgage. Lenders typically want to see 2 to 3 years of audited or accountant-prepared accounts, recent bank statements, and management accounts for the current period. For investment mortgages, the primary underwriting metric shifts towards rental income coverage: rent receivable must cover debt service by the required multiple at a stressed rate. A personal guarantee from company directors is standard on most commercial mortgage facilities.

For investment properties, tenant covenant quality is a key pricing input. A long lease to a national or institutional-grade tenant is viewed very differently from a short lease to a single small business. The stronger the tenant and the longer the unexpired lease term, the lower the lender's assessment of income risk — and the tighter the margin they are prepared to offer. Reviewing lease structures before application, and presenting the income profile clearly, consistently improves the terms on offer.

The headline interest rate on a business property mortgage is only part of the total cost of borrowing. Before committing to a facility, you should model all associated costs to arrive at an accurate effective cost of funds across your intended hold period.

Arrangement fees are charged by the lender and typically run at 1% to 2% of the loan amount. On a £500,000 loan this equates to £5,000 to £10,000. Some lenders allow the arrangement fee to be added to the loan balance (rolled up), reducing the day-one cash outlay but increasing the interest-bearing principal. Broker fees, where charged, are generally 1% to 1.5% of the loan amount and are payable on completion of the facility.

Valuation costs depend on the property type and value. A RICS commercial valuation for a standard property worth £750,000 might cost £1,500 to £3,000; larger or more complex assets will cost proportionately more. You will also incur legal fees — both your own solicitor's costs and the lender's legal fees, which the borrower is conventionally required to meet. Together, legal costs on a standard commercial mortgage transaction commonly run to £3,000 to £8,000 across both sides.

Early repayment charges apply during fixed-rate periods and sometimes for a set period on variable rate products. ERCs are typically calculated as a percentage of the outstanding balance, commonly declining from 5% in year 1 to 1% in year 5 on a 5-year fixed product. If you sell the property or refinance before the ERC period expires, these charges can represent a significant cost. Our guide to bank vs specialist development finance explores how fee structures compare across lender types, which is particularly relevant if you are weighing mainstream bank terms against specialist lender pricing.

Before approaching lenders, modelling the likely monthly commitment and total cost of borrowing against your business cashflow is essential. A commercial mortgage calculator combines four inputs — loan amount, interest rate, term in years, and repayment basis (capital-and-interest or interest-only) — to produce a monthly payment, total interest payable over the term, and a balance profile over time. For property investors, the calculator should also incorporate the projected rental income so you can test the interest coverage ratio at both the contracted rate and a stressed rate 1 to 2 percentage points above.

A £750,000 commercial mortgage at 7.0% p.a. over 25 years on a capital-and-interest basis produces a monthly payment of approximately £5,300 and total interest paid across the full term of around £841,000. Switched to interest-only at the same rate, the monthly payment drops to £4,375 but the principal of £750,000 remains outstanding at the end of the term and must be repaid either by refinance, sale of the property, or accumulated cash reserves. For investment facilities, interest-only is standard; for owner-occupier facilities, lenders typically prefer capital-and-interest to amortise the debt across the term.

Model against realistic rate scenarios. Given the sensitivity of commercial borrowing to base rate movements, it is good practice to model both a central case and a stressed case 2 percentage points above the contracted rate. Lenders will already perform this stress test as part of their underwriting, particularly for investment facilities where the interest coverage ratio must still hold at the stressed rate. Running the same exercise yourself before application highlights any vulnerability in the proposed structure and allows you to adjust loan size or term before formal submission.

The business property mortgage market is fragmented across high-street banks, challenger banks, specialist commercial lenders, and alternative finance providers. Each operates its own pricing model, has its own appetite for different property types, and applies different criteria for assessing borrower strength. NatWest, Shawbrook, InterBay, and a broad group of other specialist lenders all compete for the same owner-occupier and investment commercial cases, but the margin each will offer on any given deal varies by several hundred basis points. Accessing the full market — rather than the two or three lenders you might approach directly — is the most reliable way to ensure you are not paying an unnecessary margin premium.

Construction Capital works with a panel of 100+ lenders covering the full spectrum of commercial mortgage products, from mainstream bank facilities through to specialist lenders who accommodate complex property types such as HMOs and mixed-use assets, non-standard income structures, or borrowers with prior credit history that requires careful presentation. We also arrange joint venture and refurbishment finance structures for borrowers who need a layered solution beyond a standalone commercial mortgage. Drawing on Matt's 25+ years of experience in UK property finance and £500M+ arranged across his career, we understand which lenders are actively deploying capital in which sectors, and at what margins, at any given point in the market cycle.

A specialist broker adds value beyond simply distributing your application across multiple lenders. We package the case — structuring the application to address the specific risk concerns of each target lender, presenting the borrower's financial position clearly, and providing market context that supports the proposed valuation. This professional presentation consistently produces narrower margin offers than borrowers achieve approaching lenders directly, and typically reduces the time to formal offer by several weeks. Lender due diligence tends to move faster when a case arrives with a broker's packaging note and supporting financial pack already in order.

We provide nationwide coverage across England, Scotland, Wales, and Northern Ireland and can introduce commercial mortgage facilities from £150,000 upwards. Whether you are purchasing owner-occupied commercial premises, acquiring investment property, refinancing an existing commercial mortgage onto more competitive terms, or considering whether a bridging loan or auction finance facility is the appropriate short-term structure before moving to long-term commercial finance, our team can provide a market-wide view of available rates and terms without obligation.