Commercial vs semi-commercial property, and how lenders classify it
A shop is commercial. A flat is residential. But a shop with a flat above is "semi-commercial", and lenders treat it in surprisingly different ways.
Written by Matt Vincent DipFA, CeMAP, CeRER, BSc · Published 25 June 2026 · Version 1.0 · 6 min readLenders sort property into broad types, and the type changes which lenders will help and how they price the loan. The three you'll hear most are:
- Commercial, wholly business use. A shop, office, warehouse, industrial unit, or pub with no living accommodation.
- Semi-commercial (mixed-use), part business, part residential in the same building or title. The classic example is a shop, office or restaurant with a flat above it.
- Residential, wholly a home (including standard buy-to-let). These fall outside this guide and the tool.
Why semi-commercial is treated specially
Because a mixed-use property has a residential element, it can sometimes access different, and occasionally cheaper, funding than pure commercial. But lenders are fussy about how much of the property is residential versus commercial, and they don't all measure it the same way.
How lenders decide the split
A lender will look at the proportion that is commercial, and may measure it by any of:
- Floor area, what percentage of the square footage is commercial.
- Value, what percentage of the property's value sits in the commercial part.
- Income, what percentage of the rent comes from the commercial part.
Each lender sets its own cut-offs. As a rough guide you'll see thresholds like these, though they vary a lot:
| Roughly how it's classified | What often happens |
|---|---|
| Mostly commercial | Treated as a commercial case; priced on the commercial side |
| A genuine mix | Treated as semi-commercial; specialist mixed-use lenders compete |
| Mostly residential, small shop | Some lenders may treat it closer to a residential/BTL case |
The practical takeaway
Two near-identical buildings can end up with very different deals purely because of how the commercial/residential split is measured. If your property is mixed-use, it's well worth comparing widely (and getting advice) rather than assuming one lender's classification is the final word.
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This guide was published on 25 June 2026 (version 1.0) and reflects our understanding at that time. It is general information about commercial mortgages, not financial advice or a recommendation. Lending criteria, interest rates and tax rules change over time, so please confirm current details with a qualified advisor before acting. Reference: PL-CM-COMMERCIAL-v10.