Commercial buy-to-let mortgages finance commercial property purchased specifically to let to business tenants. They are the commercial equivalent of residential buy-to-let â the same investment logic applies (rental yield must cover the debt), but the property type, underwriting, and lender market are entirely different.
The term is also used, slightly loosely, to describe mortgages on large or complex residential portfolios that are structured as commercial lending â typically where the portfolio is held in a limited company and the loan size or complexity takes it outside standard buy-to-let product criteria.
Commercial BTL vs Residential BTL: The Key Differences
Property type: commercial BTL covers offices, retail units, industrial, warehousing, and specialist commercial property. Residential BTL covers houses and flats let to individuals.
Regulation: residential buy-to-let mortgages for individual landlords are regulated by the FCA (under MCOB) where the property is or will be the borrower’s home, and subject to PRA landlord rules. Commercial BTL lending is unregulated â it is a business transaction between the lender and a business borrower.
Underwriting: commercial BTL is underwritten on DSCR and commercial LTV, not on the simplified ICR (interest coverage ratio) calculations used in standard residential BTL.
Tenant type: the tenant is a business, not an individual. The quality and financial strength of the commercial tenant (the covenant) is a significant part of the underwriting assessment.
Lease structure: commercial leases are typically longer and more complex than residential ASTs. A 10-year lease with 5-year rent reviews and a full repairing and insuring (FRI) obligation on the tenant provides a very different risk profile from a 6-month AST.
How Commercial BTL Lending Is Assessed
DSCR: the passing rent (or ERV if the property is vacant) divided by annual debt service. Most lenders require 1.25x minimum, with some requiring 1.35x for specialist property or higher-risk tenants. [EDITORIAL JUDGEMENT â verify against lender-specific criteria]
LTV: typically 65â70% for standard commercial investment. Lower for specialist or vacant property. [VERIFY â cross-reference Paragon, InterBay, Shawbrook criteria]
Tenant covenant: the financial strength of the tenant. Publicly listed companies, government bodies, and established businesses with audited accounts provide strong covenants. Small or newly incorporated businesses provide weaker covenants.
Lease terms: length, rent review mechanism, break clauses, and any landlord incentives (rent-free periods, fit-out contributions) all feed into the income assessment.
Void periods and reletting risk: lenders consider what happens if the current tenant vacates. A property in a liquid market with strong demand will relet quickly; a specialist property in a thin market may sit vacant for an extended period.
Interest-Only and Repayment
Commercial BTL mortgages are commonly structured as interest-only, for the same reason as commercial investment mortgages generally: the investor’s return profile is based on income yield and capital appreciation, and interest-only maximises cash yield during the term.
The exit from an interest-only commercial BTL mortgage is sale or refinance at maturity. Lenders assess the plausibility of this exit at origination.
Limited Company Borrowing
Commercial BTL is frequently structured through a limited company or SPV (Special Purpose Vehicle). The tax treatment of commercial property income held in a company differs from personal ownership, and many investors use corporate structures for portfolio building. Lenders who lend to SPVs assess the company’s financial position and the directors’ personal guarantees alongside the property security.
Portfolio Landlords
Landlords with large residential portfolios held in limited companies sometimes access commercial BTL lending when their portfolio size, loan size, or structure takes them outside standard residential BTL product criteria. Commercial underwriting â with DSCR assessment rather than ICR â is more flexible for complex portfolio structures but also more demanding in terms of information requirements.
Which Lenders Operate Here
The commercial BTL market is primarily served by specialist lenders:
- Paragon Bank: strong on investment property portfolios, including commercial and mixed portfolios held in limited companies
- InterBay (OSB Group): specialist in commercial investment, including portfolios combining commercial and residential
- Shawbrook Bank: broad commercial property appetite including BTL investment
- Together Money: willing to consider complex cases including adverse credit borrowers and unusual property types
High street banks have limited appetite for commercial BTL unless it is part of a broader business banking relationship or the deal is very large.
[VERIFY â confirm current criteria and appetite from each lender’s website]
Related Pages
- Commercial Investment Mortgages
- Semi-Commercial Mortgages
- Commercial Mortgage Rates
- DSCR Explained
- Commercial Mortgage LTV Explained
- Best Commercial Mortgage Lenders UK