Commercial Buy-to-Let vs Residential Buy-to-Let
You’re borrowing to let commercial property to business tenants, and that pulls you into a different market from residential buy-to-let. The investment logic rhymes, the rent has to cover the debt and your cash flow, but the property type, the underwriting and the lender list are all different.
Your deal is unregulated, because it’s a business transaction between a lender and a business borrower. Residential buy-to-let for an individual landlord can be FCA-regulated where the property is or will be their home, so we treat the two as separate products, not variations on one.
You can’t rely on the simple sums either. On the Monday your broker sizes it, the lender reaches for DSCR and commercial LTV, not the lighter interest-coverage test that props up a standard residential buy-to-let.
| Factor | Commercial BTL | Residential BTL |
|---|---|---|
| Property | Offices, retail, industrial, warehousing | Houses and flats let to individuals |
| Regulation | Unregulated business lending | Can be FCA-regulated for individual landlords |
| Affordability test | DSCR and commercial LTV | Simplified interest coverage ratio |
| Tenant | A business, assessed on covenant strength | An individual on an AST |
| Lease | Long, often FRI with rent reviews | Short assured shorthold tenancy |
| Verified 21 July 2026. | ||
How Commercial Buy-to-Let Lending Is Assessed
Your rent has to clear the debt with room to spare. Lenders divide the passing rent (or the estimated rental value if the unit is empty) by the annual debt service, and most want a DSCR of at least 1.25x, rising to 1.35x for specialist property or a weaker tenant.
Your tenant matters as much as your building. A listed company, a government body or an established business on a long lease is strong covenant that supports your cash flow; a small or newly-formed tenant is thinner cover, and the lender prices that doubt in.
You can’t ignore what happens if the tenant leaves. At quarter-end your accountant models a void, and a specialist unit in a thin market is exactly where an empty period stretches and the reletting risk bites.
- DSCR. Passing rent or ERV divided by annual debt service. Usually 1.25x minimum, 1.35x for specialist property or higher-risk tenants.
- LTV. Typically 65% to 70% for standard commercial investment, lower for specialist or vacant property.
- Tenant covenant. The financial strength of the tenant. Listed companies and established businesses are strong; newly-incorporated ones are weak.
- Lease terms. Length, rent-review mechanism, break clauses and any incentives all feed the income assessment.
- Void and reletting risk. How quickly the unit would re-let if the tenant left. A liquid market re-lets fast; a thin one sits empty.
Interest-Only Commercial Buy-to-Let
You’ll usually run a commercial buy-to-let interest-only, for the same reason investors do across commercial property. The return comes from income yield and capital growth, and interest-only keeps the cash yield working for you during the term rather than paying down capital.
Your exit is a sale or a refinance at maturity, and that’s not an afterthought. On the Friday your accountant stress-tests the exit, the lender wants a realistic plan for repaying or rolling the loan, and that plan protects both your cash flow and your credibility with the next lender.
Buying Property Through a Limited Company or SPV
You’ll most often hold commercial buy-to-let inside a limited company or a special purpose vehicle. The tax treatment of company-held property income differs from personal ownership, and many investors use a corporate structure to build a portfolio in a way that suits their cash flow.
Your company’s finances and your own both come under the lens. Lenders that lend to an SPV assess the company’s position and take directors’ personal guarantees alongside the property security, so the structure protects some things but not your accountability for the debt.
Portfolio Landlords and Commercial BTL
You may arrive here because your portfolio has outgrown standard buy-to-let. Landlords with large limited-company portfolios reach commercial BTL when the portfolio size, loan size or structure takes them outside standard residential BTL product criteria.
Your reward for the switch is flexibility, at a price. Commercial DSCR underwriting handles complex portfolio structures more comfortably than the residential interest-coverage test, but it asks a great deal more of you in information, so budget the time it takes on top of your cash flow.
Which Lenders Offer Commercial Buy-to-Let
You’ll deal mostly with specialist lenders here. High-street banks have limited appetite for commercial BTL unless the deal is very large or it sits inside a broader business banking relationship, so the working market is a handful of specialists.
Your broker’s knowledge of who wants what is worth real money. In our commercial mortgage reviews we see the same names lead this market, each with a slightly different tilt on property type, portfolio complexity and credit history.
- Paragon Bank. Strong on investment-property portfolios, including commercial and mixed portfolios held in limited companies.
- InterBay, part of the OSB Group. Specialist in commercial investment, including portfolios combining commercial and residential.
- Shawbrook Bank. Broad commercial property appetite including buy-to-let investment.
- Together. Will consider complex cases, including adverse-credit borrowers and unusual property types.
Commercial Buy-to-Let Mortgage FAQs
What is a commercial buy-to-let mortgage?
It’s a mortgage that finances commercial property bought specifically to let to business tenants, such as an office, retail unit, industrial building or warehouse. It’s the commercial equivalent of residential buy-to-let: the rent still has to cover the debt, but the property type, underwriting and lender market are entirely different. The term is also used, a little loosely, for large or complex residential portfolios held in a limited company that fall outside standard buy-to-let product criteria and get structured as commercial lending instead.
Is a commercial buy-to-let mortgage regulated?
Generally no. Commercial buy-to-let is treated as an unregulated business transaction between a lender and a business borrower. That contrasts with residential buy-to-let for an individual landlord, which can be FCA-regulated where the property is or will be the borrower’s own home, and is subject to PRA landlord rules. Being unregulated doesn’t mean unprotected in the ordinary sense, but it does mean you should read the terms carefully and take advice, because the consumer-facing rules that apply to a regulated mortgage won’t apply here.
What DSCR and LTV do lenders want?
Most lenders want a debt service coverage ratio of at least 1.25x, meaning the rent covers the annual debt service with a 25% margin, rising to around 1.35x for specialist property or a weaker tenant covenant. LTV is typically 65% to 70% for standard commercial investment property, and lower for specialist or vacant buildings. Both figures move with the strength of the lease and tenant: a long lease to a solid business supports keener terms, while a short lease or a shaky tenant pulls the available LTV down.
Which lenders offer commercial buy-to-let mortgages?
Mostly specialist property lenders. Paragon, InterBay (part of the OSB Group), Shawbrook and Together are among the established names, each with a slightly different appetite for property type, portfolio complexity and credit history. A commercial mortgage broker earns their keep here by matching your specific property, tenant and structure to the lender most likely to price it well.
How we researched commercial buy-to-let mortgages
What we covered. We explain how commercial buy-to-let works in 2026: how it differs from residential BTL, the DSCR and LTV lenders use, the weight placed on tenant covenant and lease, interest-only structuring, SPV borrowing, portfolio-landlord routes, and which lenders write these deals.
Data sources. DSCR, LTV, regulation and lender detail are drawn from specialist lender criteria and the lenders we assess in our commercial mortgage reviews.
How we handle gaps. Commercial buy-to-let is unregulated and lender criteria are not always published, so we give indicative DSCR and LTV ranges and say the lease, tenant and structure decide your terms.
Update cadence. We re-verify this page at least monthly, and whenever the MPC moves base rate. The verification date reflects the most recent full review. Some links on this page are affiliate links, see our editorial policy.
Regulatory note. This page is editorial content, not regulated financial advice. Commercial buy-to-let lending is generally unregulated, so compare facilities and read the terms before you sign.