Commercial Mortgage LTV and DSCR: A UK SMB Guide

What LTV Means in a Commercial Mortgage Context

LTV expresses the loan amount as a percentage of the lender's assessed value of the property, and most UK commercial lenders set their ceiling between 65% and 75% depending on property type, sector, and borrower covenant strength. A trading pub or restaurant typically attracts a lower ceiling, often 60-65%, because the value is partly tied to the business rather than the bricks, making it harder for a lender to realise security on default.

Owner-occupiers generally access slightly higher LTVs than investment buyers, because the lender benefits from both property security and a trading business that services the debt. Semi-commercial properties, those with a retail unit below and residential flats above, sit in a middle tier and are assessed on the dominant use. Borrowers who push for the maximum LTV should expect a higher margin over base and possibly a personal guarantee requirement from directors.

How Lenders Calculate DSCR

DSCR measures whether the rental income or trading profit generated by a property is sufficient to cover the annual mortgage payments, and a ratio of 1.25x is the most common minimum floor across UK commercial lenders, meaning the income must be 25% above the debt cost. Some challenger lenders accept 1.15x for strong covenants, while high-street banks often require 1.35x or above for hospitality or leisure assets.

For owner-occupier deals, lenders assess adjusted EBITDA rather than rent, stripping out depreciation, directors' drawings above a market salary, and one-off items. It is worth asking your broker or accountant to run a DSCR calculation before submission using the lender's actual stressed rate, which is usually base rate plus a fixed loading, commonly 2-3%, rather than the headline product rate. A marginal DSCR at application could tip into non-compliance at stress-test, triggering a decline even when the headline numbers look comfortable.

Owner-Occupier vs Investment Commercial Mortgages

Owner-occupier commercial mortgages are taken by businesses that will trade from the property themselves, while investment commercial mortgages are used to acquire properties let to third-party tenants, and the underwriting logic differs significantly between the two products. For owner-occupiers, the lender is underwriting the business as much as the property, which means two or three years of audited or accountant-certified accounts are typically required alongside the property valuation.

Investment commercial mortgages are underwritten primarily on the lease: unexpired lease term, tenant covenant, and passing rent versus estimated rental value. A property with a blue-chip tenant on a 10-year full repairing and insuring lease is far easier to mortgage at a keen rate than one with a short lease or multiple short-term tenants.

Void risk is a key concern for investment lenders, so multi-let properties may be stress-tested assuming one or more units are empty throughout the term. Both routes require a commercial valuation from an RICS-registered surveyor acceptable to the lender.

How Interest Rates Are Structured

Commercial mortgage rates in the UK are typically quoted as a margin over the Bank of England base rate or over SONIA, and with the Bank of England base rate currently at 3.75%, all-in rates for standard owner-occupier deals range from roughly 6.0% to 8.5% depending on LTV, DSCR, and sector. Fixed-rate options are available, usually priced off swap rates for the chosen term, and many borrowers prefer the certainty of a five-year fix when planning business cashflow.

Arrangement fees typically run from 1% to 2% of the loan, and some lenders charge an exit fee of 0.5-1% if the loan is repaid within the first few years, particularly on longer fixed-rate products. Valuation fees, legal fees, and broker fees are additional costs that must be factored into the true cost of borrowing. Asking for a full cost illustration before accepting heads of terms allows you to compare products on a like-for-like basis rather than relying on headline rate alone.

Common Reasons Commercial Mortgage Applications Stall

Commercial mortgage applications most commonly stall at underwriting when the property valuation comes in below the agreed purchase price, when accounts show a DSCR below the lender's floor, or when the title reveals unexpected restrictions such as restrictive covenants, flying freeholds, or overage clauses. Each of these issues can be resolved, but resolution takes time and sometimes additional cost, so identifying them early through pre-application due diligence is important.

Environmental reports and flood risk assessments are increasingly required by lenders, particularly for industrial and agricultural properties, and a contaminated land report can take six to eight weeks to procure. Planning status is another common sticking point: a property used for a purpose not reflected in its planning consent may be valued on permitted use rather than actual use, compressing LTV headroom significantly. Using a commercial mortgage broker who has placed similar deals with the target lender reduces the likelihood of avoidable surprises during underwriting.

Improving Your Application Before You Apply

Strengthening your application before submission is the most effective way to secure better LTV, a lower margin, and a faster credit decision, and the most impactful steps are ensuring your accounts clearly evidence DSCR headroom and that your Companies House filings are up to date. If your most recent accounts are more than 12 months old, many lenders will request management accounts covering the gap period, so having these prepared in advance removes a common cause of delay.

Director credit history matters even on limited company applications: most commercial lenders run personal credit checks on directors with a material shareholding, typically 20% or more. CCJs or defaults registered against a director in the past three years will need to be explained and may restrict which lenders are accessible. A clean credit position, strong DSCR, LTV below 65%, and a property in a liquid location with clear planning consent is the profile that attracts the keenest pricing and the fewest conditions of offer.

Step-by-step

1. Obtain two to three years of accountant-certified accounts and confirm your adjusted EBITDA or net rental income.
2. Run a preliminary DSCR calculation using the lender's stressed rate, typically base rate plus 2-3%, to check headroom above the 1.25x floor.
3. Commission a pre-application desktop valuation or speak to a RICS surveyor to sense-check the likely LTV position before approaching lenders.
4. Check Companies House filings are current and that all directors with 20%+ shareholding have reviewed their personal credit files.
5. Instruct a commercial mortgage broker to approach lenders whose criteria match your property type, LTV, and DSCR profile.
6. Review the full heads of terms illustration, including arrangement fee, exit fee, and any conditions of offer, before committing.
7. Appoint a solicitor experienced in commercial property to manage title, planning, and environmental due diligence in parallel with lender legal work.

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Frequently asked questions

By Adam Parker, Founder & Managing Director, Muswell Rose. Reviewed by Oliver Mackman, Director, Best Business Loans Ltd. Last reviewed 2026-07-13.