✅ What are semi-commercial mortgage rates and deposits?
Rates currently run 5.5% to 8% — below pure commercial, since lenders see mixed-use as lower risk: 5.5–6.5% for residential-dominant properties with strong covenants and sub-65% LTV; 7–8% where the commercial element is larger or the borrower is new to it. Deposits run 30–40%, narrowing to 25–30% with a strong commercial tenant. The underestimated factor: the floor-area split between residential and commercial fundamentally changes which lenders will even consider the deal and how they price it — get it calculated before approaching anyone. Valuation blends both income streams, so a weak commercial unit drags the whole assessment. Money Pilot reads the split first, across 200+ lenders at zero broker fees — FCA regulated (FRN: 968705).
Buy a building with a shop downstairs and flats above, and you’d assume the mortgage conversation is roughly the same whichever way the split falls. It genuinely isn’t, and the single variable that most investors underestimate is exactly how much the residential-to-commercial split changes both your available lenders and your rate.
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What is a semi-commercial mortgage?
A semi-commercial mortgage, sometimes called a mixed-use mortgage, funds a property combining both residential and commercial elements, a shop with a flat above, an office building with residential units elsewhere in the block, a pub with owner’s accommodation. Because the property generates income from two genuinely different sources, lenders assess both parts, rather than treating it purely as commercial or purely as residential.
Why does the split between commercial and residential matter so much?
Because it fundamentally changes which lenders will even consider your deal, and how they price it. Lenders typically measure the split by floor area. A property that’s around 70% residential by floor area may qualify for specialist buy-to-let lenders offering semicommercial products priced closer to their standard BTL range, considerably more competitive than you might expect. A property that’s 70% commercial gets assessed on commercial property criteria instead, typically meaning higher rates and more conservative LTVs.
My top tip: get the floor area split calculated properly and early, before you start approaching lenders. Knowing whether you’re on the residential-leaning or commercial-leaning side of that boundary tells you which entire category of lender to focus your search on, rather than wasting time with the wrong pool.
What rate should you currently expect?
Semi-commercial mortgage rates currently typically range from 5.5% to 8% per annum, sitting below equivalent pure commercial rates, since lenders view the diversified income across two asset classes as a genuine risk mitigant, but above standard residential buy-to-let rates, reflecting the added underwriting complexity of assessing two income streams at once.
Within that range:
- 5.5-6.5%: properties with a dominant residential element, strong tenant covenants on both parts, established rental income, an experienced borrower, and LTV below 65%
- 7-8%: properties with a larger commercial element, shorter remaining lease terms on the commercial part, first-time commercial investors, or LTV approaching 75%
As a live, current example, Hampshire Trust Bank expanded its semi-commercial offering in mid-2026, introducing a new pricing band for loans between £250,000 and £1m from 6.64%, and a new 65% LTV range from 6.24%, giving a genuine sense of where specialist lender pricing sits right now.
What deposit do you actually need?
Typically 30-40% of the purchase price, though this can narrow to 25-30% where the commercial element has a strong tenant covenant, a well-established business on a reasonable lease term, since that strengthens the overall income picture lenders are assessing.
How is the property actually valued and assessed?
The residential element is valued broadly as a standard buy-to-let would be, assessed on rental income or potential, condition, and location. The commercial element is valued on its own basis, the tenant’s covenant strength, lease terms, and trading performance if it’s owner-occupied. Lenders then combine these in one of a few ways:
- Some use the lower of the two valuations, the most conservative approach
- Others use a weighted average or a blended DSCR across both income streams
This means a strong commercial tenant can meaningfully improve your overall borrowing capacity, while a weak or vacant commercial unit can drag the whole assessment down, even if the residential element alone would have supported a larger loan.
A worked example
Consider a Victorian terrace with two retail units on the ground floor and three self-contained residential flats above, purchase price £850,000. With a 35% deposit (65% LTV) and reasonably strong retail tenants on established leases, this sits in the more competitive pricing tier, rates from around 6.25%, with rental coverage at the stressed rate landing around 120-125%, workable for most specialist lenders. Drop to a 25% deposit (75% LTV) on the same property, and the pool of available lenders narrows considerably, specialist lenders only, with rates moving above 7%.
How long does the process take?
Typically 4-8 weeks from application to completion for a straightforward case, with the final funds release usually occurring 3-5 days after the formal mortgage offer is issued, once your solicitor has completed the final checks and documentation.
Why do fewer lenders operate in this space than standard commercial or residential?
Because assessing two income streams with genuinely different risk profiles, a commercial lease with a business covenant, and a residential tenancy with its own separate protections and expectations, requires specific underwriting expertise most lenders simply haven’t built. This is exactly why semi-commercial sits as a genuine niche within the wider market, fewer lenders, but a real and growing product category as more investors recognise the yield and diversification benefits mixed-use property can offer.
The bottom line
Semi-commercial mortgages currently are typically priced between 5.5% and 8%, with a 30-40% deposit the realistic starting point, but the single factor that changes everything is the floor area split between residential and commercial. Get that calculated properly before you start approaching lenders, it determines which entire category of lender you should be talking to and can be the difference between accessing near-BTL pricing and being pushed into the more expensive, more conservative end of the commercial market.
