Commercial Financing Rates in the UK: A Developer's Guide

The phrase 'commercial financing rates' covers the interest charged on any loan secured against, or used to acquire or develop, a commercial or investment property in the UK. Unlike residential mortgage rates — which are heavily standardised across lenders — commercial rates are almost entirely bespoke, negotiated deal by deal based on the risk profile of the borrower and the asset.

In practice, the term spans several distinct product categories: commercial mortgages (used to buy or refinance offices, retail units, industrial premises, and mixed-use buildings), bridging loans (short-term acquisition or refurbishment finance), development finance (ground-up construction lending), and mezzanine finance (higher-risk second-charge lending that sits behind senior debt). Each product has its own rate structure, fee profile, and maximum LTV.

All variable commercial rates are ultimately anchored to the Bank of England base rate, with lenders adding a margin that reflects their cost of funds and the perceived risk of the deal. Fixed rates are typically priced against SONIA swap rates for the relevant term. Understanding this structure helps developers and investors interpret quoted rates accurately and compare like for like when reviewing indicative terms from multiple lenders.

Most commercial mortgage lenders in the UK offer both fixed-rate and variable-rate products. The choice between them is a risk management decision as much as a pricing one.

Fixed rates offer payment certainty for a defined period — typically two, three, or five years — after which the loan reverts to the lender's standard variable rate (SVR) or the borrower refinances. Fixed commercial rates are set at a margin over the relevant SONIA swap rate for the fix period. In a high-rate environment, fixing can provide meaningful budgeting certainty for owner-occupiers and property investors with leveraged portfolios. The downside is that most fixed-rate commercial mortgages carry early repayment charges (ERCs) during the fixed period, which can range from 2–5% of the outstanding loan in the early years.

Variable tracker rates move directly with the Bank of England base rate, typically quoted as 'base rate plus X%'. When the base rate falls, monthly interest costs fall automatically. Bridging loans and development finance facilities are almost always variable, quoted as a monthly rate (e.g. 0.85% p.m.) or as an annual rate expressed as base rate plus margin.

Unlike residential mortgages, commercial financing rates are almost entirely bespoke. Lenders assess a combination of asset and borrower factors before arriving at a quoted margin. Understanding these levers gives developers and investors a clear picture of what they can do to strengthen their application and access more competitive terms.

Loan-to-value (LTV) is the single most important pricing variable. Most commercial mortgage lenders cap at 70–75% LTV for investment properties and 75% for owner-occupied premises. Deals at 65% LTV or below typically attract materially finer margins than those approaching the maximum — a difference of 0.5–1.5% p.a. is common. For development finance, lenders quote loan-to-GDV (gross development value) and loan-to-cost (LTC) ratios rather than straight LTV; typical caps are 65% LTGDV and 80–85% LTC. Understanding how lenders calculate GDV versus open market value is therefore central to anticipating where your rate will land.

Property type and quality significantly influence lender appetite. Industrial and logistics assets are generally viewed as lower risk than high street retail or secondary office space. Mixed-use schemes with a residential element often attract better pricing than pure commercial assets, as residential demand provides lenders with a clearer exit path. Retail assets in secondary or tertiary locations continue to be priced at a premium to reflect vacancy and tenant covenant risk.

Borrower experience and track record carry substantial weight. Experienced developers with a documented portfolio of completed schemes in a similar asset class will consistently access finer margins than first-time commercial buyers. Lenders also assess rental income coverage on investment deals — an interest coverage ratio (ICR) of 125–150% is a common minimum, meaning the passing rent must exceed the annual loan interest by that multiple.

Loan size is a counterintuitive factor: larger facilities often attract tighter margins because the fixed costs of deal origination are spread across a larger base, and lenders compete more keenly for relationship-defining transactions. Credit history, personal guarantees, and business trading history round out the full risk picture lenders consider before pricing a commercial deal. Most specialist lenders will require a personal guarantee from at least one principal director on limited-company applications; the extent of that guarantee — limited vs unlimited, and whether supported by a net-worth statement — is a negotiable point that also feeds into the risk-adjusted margin.

Rates across the UK commercial property finance market vary considerably by product. The table below shows indicative ranges for 2026, based on the specialist lending market. These represent typical terms on well-structured applications — the best-in-class rates require strong LTV, solid borrower experience, and a quality asset.

For bridging finance and development finance, interest is almost always rolled up or retained — meaning no monthly cash payments are required during the loan term. Instead, accrued interest is repaid from sale proceeds or a refinance at exit. This fundamentally changes the affordability calculation compared with a commercial mortgage, where monthly interest or capital repayments are required throughout the term. When comparing development finance against bridging, the rolled-up interest structure means the effective cost compounds over time, making the exit timeline a critical input in any rate comparison. Auction finance — a specialist form of short-term bridging designed for 28-day auction completions — typically prices at the upper end of the bridging range to reflect the speed risk. Joint venture (JV) structures, where the lender takes a share of profit in exchange for a reduced or subordinated interest rate, sit outside this pricing framework entirely and are negotiated on bespoke commercial terms. See our guide development finance vs bridging loans for a full product-level comparison.

The headline interest rate is only one component of the total cost of commercial borrowing. A rate comparison that ignores fees and ancillary costs can lead developers to pursue the wrong deal. Before committing to any commercial finance facility, the following cost items must be factored in alongside the quoted rate.

Arrangement fees are charged by virtually all lenders on commercial and development loans. The typical range is 1–2% of the total loan amount, though some specialist lenders charge up to 2.5% on complex or higher-risk transactions. On a £1M facility at 2%, that is £20,000 added to the cost — typically deducted from the first drawdown or added to the loan balance at completion.

Valuation fees reflect the cost of commissioning a RICS-qualified surveyor to value the security property. Commercial valuations are considerably more expensive than residential equivalents: expect to pay £2,000–£8,000 for a straightforward single commercial asset, and significantly more for large mixed-use or development appraisals involving both land and end-value assessments. Some lenders require a standalone reinstatement cost assessment in addition to the market valuation. Our guide to RICS Red Book valuations in development finance explains how surveyors arrive at their figures and how to challenge assessments you consider too conservative.

Legal fees cover both the borrower's own solicitors and the lender's panel solicitors — dual representation is standard in commercial lending. Budget for £3,000–£8,000 on each side for a straightforward commercial mortgage transaction; facilities involving multiple properties, complex ownership structures, or a special purpose vehicle can exceed £15,000 in total legal costs.

Exit fees apply on some bridging and development finance facilities, typically charged at 0.5–1.5% of the loan on redemption. Not all lenders apply exit fees, but comparing a deal with no arrangement fee against one with a 1% exit fee requires calculating total cost over the expected hold period rather than reading the headline rate alone. Broker fees — ordinarily 1% of the loan, often sourced from the lender as a procuration fee rather than charged directly to the borrower — complete the true cost picture.

Accessing the best available commercial financing rates requires both preparation and market access. Lenders price on risk: a well-packaged application demonstrating strong LTV, credible borrower experience, and a clear exit strategy will consistently outperform a poorly structured one — even where the underlying deal quality is identical.

Before approaching lenders, prepare a detailed development appraisal or investment schedule; document your track record with completed scheme evidence; reduce LTV where possible to unlock lower-risk pricing tiers; and ensure your exit strategy — whether sale, refinance to a term commercial mortgage, or development exit finance — is clearly articulated with supporting comparable evidence. Specialist lenders consistently outperform high-street banks on pricing flexibility for complex or time-sensitive deals, and structuring senior debt alongside mezzanine finance can unlock schemes that a single senior lender would decline.

The most important structural decision is whether to approach lenders directly or through a specialist broker. Direct approaches limit you to a single lender's product range, rate card, and internal credit appetite. A whole-of-market broker with access to a wide panel of specialist lenders — including private debt funds, challenger banks, and international lenders not accessible to borrowers directly — can present your deal to multiple lenders simultaneously and use competing terms to negotiate the best available rate and structure.