Semi-commercial buy-to-let
How investors fund a mixed-use property to let, and why the combined rent can make it a strong buy-to-let.
Semi-commercial buy-to-let is funding a mixed-use property, such as a shop with a flat above, to let both parts and earn from each. It uses a semi-commercial mortgage with a deposit of typically 25 to 30 percent, sized on the combined commercial and residential rent at an interest cover ratio.
At a glance
- What it isLetting a mixed-use property
- Deposit25 to 30%
- Sized onCombined commercial + residential rent
- Common structureLimited company / SPV
What semi-commercial buy-to-let means
Semi-commercial buy-to-let is buying a mixed-use property as an investment and letting both the commercial and residential parts. A shop with a flat above, let to a retailer below and a tenant upstairs, is the classic example.
It uses a semi-commercial mortgage rather than a standard buy-to-let mortgage, because the property has a genuine commercial element. The income comes from two strands of rent under one roof.
Why investors choose semi-commercial property
- Two income strands: if the shop falls vacant, the flat keeps paying
- Often higher yields than a comparable pure residential property
- Commercial leases can run longer than residential tenancies, with the tenant maintaining the unit
- Mixed-use property is charged stamp duty at the non-residential rates
- A way to diversify a portfolio beyond standard buy-to-let
The mix of commercial and residential rent is the core attraction. It spreads the vacancy risk that a single-let property carries.
How a semi-commercial buy-to-let mortgage works
The loan is secured against the whole property and sized on the combined rent. A deposit of 25 to 30 percent is the norm, against a 70 to 75 percent loan to value.
| Feature | Typical position |
|---|---|
| Deposit | 25 to 30% |
| Rate (mid-2026) | 6.5 to 8.5% pa |
| Loan to value | Up to 70 to 75% |
| Affordability | ICR on combined rent, 125 to 140% |
How lenders assess the combined rent
The lender adds the commercial rent and the residential rent and tests the total against an interest cover ratio, commonly 125 to 140 percent stressed. The combined figure must comfortably cover the mortgage interest at the stressed rate.
Two income strands often clear this test more easily than one, because a void in either part is cushioned by the other. Strong, well-documented leases on both parts are what support the loan.
The quality of each income matters as much as the total. A long lease to a solid commercial tenant counts for more than a short or rolling one, and an assured tenancy on the flat is straightforward to evidence. Where the commercial unit is vacant or between tenants, lenders may discount that income until it is proven, which lowers the loan the rent will support.
Yields on semi-commercial property
Semi-commercial assets often run at higher yields than comparable residential property, because the commercial element prices on a yield basis rather than on owner-occupier demand. That can mean more rent for the capital invested.
The trade-off is that commercial income can be less liquid: a vacant shop can take longer to re-let than a vacant flat, and the value leans on the strength of the commercial tenant. The residential part of a semi-commercial property cushions that, which is the core of its appeal as a buy-to-let.
Holding it personally or through a limited company
Most semi-commercial buy-to-let investors hold the property through a limited company or SPV, for the tax treatment of rental income and the ease of building a portfolio. Lenders are well set up for SPV borrowing.
Whether to borrow personally or through a company is a tax decision as much as a finance one, so we work alongside your accountant on the structure.
Semi-commercial versus standard buy-to-let
| Standard BTL | Semi-commercial BTL | |
|---|---|---|
| Property | Residential only | Mixed-use |
| Income | Single residential rent | Combined commercial + residential rent |
| Mortgage | Buy-to-let | Semi-commercial |
| Stamp duty | Residential rates + surcharge | Non-residential rates |
The trade-off is that semi-commercial is underwritten as a commercial loan, so the deposit and rate sit a little above standard buy-to-let, in exchange for the diversified income and the stamp duty treatment.
Building a semi-commercial portfolio
Many landlords add semi-commercial assets to a wider portfolio of buy-to-let and commercial property. Holding them through one structure can simplify financing and, where the book supports it, unlock relationship terms across several properties.
We help investors finance individual mixed-use purchases and structure the portfolio so each new asset sits cleanly alongside the rest.
- Semi-commercial buy-to-let
- Letting a mixed-use property, both its commercial and residential parts, as an investment.
- Interest cover ratio (ICR)
- The ratio of combined rent to mortgage interest a lender requires, commonly 125 to 140 percent stressed.
- Void
- A period when part of a property is unlet and earning no rent.
Semi-commercial buy-to-let: common questions
What does semi-commercial property mean?
A property that is part-commercial and part-residential under one title, such as a shop with a flat above. Letting both parts as an investment is semi-commercial buy-to-let.
What is the deposit for a semi-commercial mortgage?
Typically 25 to 30 percent of value, against a 70 to 75 percent loan to value. Strong, well-documented rent on both parts supports the lower end.
Is semi-commercial buy-to-let a good investment?
It can be, because the combined commercial and residential rent diversifies the income and often yields more than standard buy-to-let, while the property is charged stamp duty at the non-residential rates.
Can I get a buy-to-let mortgage on a property above a shop?
On a mixed-use property you use a semi-commercial mortgage rather than a standard buy-to-let mortgage, sized on the combined rent at an interest cover ratio.
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