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Semi-commercial mortgages

A semi-commercial mortgage funds a building that combines business space with residential accommodation, such as a shop with flats above or an office with a house attached. Lenders weigh both elements, and who will live in the residential part can change how the loan is treated legally.

Graham Nash, Commercial Finance Director at Sorbus Finance
Arran Turner, Managing Director at Sorbus Finance

Speak with Graham or Arran

Why mixed-use is its own category

Residential lenders may decline property with a commercial element, and some commercial lenders are cautious about residential units. Specialist lenders assess the combination, looking at both income streams, the balance between them and how saleable the whole building is.

Occupation and regulation

If you or a close family member will live in the residential part, the loan may fall within mortgage regulation even if the main purpose is commercial. If the flats are let to unrelated tenants and the borrower is a company, the position is often different. These are factual tests; your broker and lender will confirm the treatment.

Two kinds of tenancy

The commercial lease and residential tenancies are governed by different laws and documents. Lenders will want both sets, and residential letting brings its own compliance responsibilities such as safety certificates and deposit protection. Separate access, separate utilities and separate titles can all matter to valuation.

Hypothetical example, not a real client: a café owner buys a building with two flats above, planning to run the café and let the flats. Lenders may assess the café trading for the commercial part and the residential rents separately.

Tax is not straightforward

Mixed-use property can be treated differently for Stamp Duty Land Tax in England and Northern Ireland, and Scotland and Wales have their own taxes. VAT can also be complicated where an option to tax affects part of a building. Your accountant or solicitor should confirm the position on your purchase.

Valuing a building with two personalities

Valuers may approach mixed-use buildings by considering the commercial and residential parts on different bases and then looking at the whole. A strong flat over a weak shop, or the reverse, can produce a different overall view than you expect. Saleability as a single lot matters, because if a lender ever needed to sell, it would usually sell the building as it stands.

Practical layout counts. Separate street access to the flats, independent utilities and clear boundaries between commercial and residential space tend to make a building easier to let, value and sell. Shared entrances, a flat accessed through the shop or a residential unit that relies on the business for heating can all raise questions.

If the commercial space falls empty

Ground-floor commercial units in local high streets can take time to relet. If the shop becomes vacant, residential rent may need to cover the loan for a period, while you pay empty-property costs. Think about that scenario before borrowing, and keep reserves that would let you hold the building through a void without falling behind.

Residential compliance

Letting flats brings landlord obligations that commercial owners may not be used to, such as gas and electrical safety checks, deposit protection, licensing in some areas and fire safety for shared parts. Lenders and valuers may ask about these. Non-compliance can affect rent, value and even your ability to let, so check what applies locally before buying.

Insurance is another practical point: mixed-use buildings need cover that recognises both the commercial activity and the residential occupiers, and lenders will expect it in place.

Your property may be repossessed if you do not keep up repayments on a loan secured on it. Sorbus Finance is a broker, not a lender. Finance is subject to lender criteria, status, valuation and affordability. We work with a panel of lenders, not the whole market, and do not promise a rate, fee level or outcome.

Before you apply

Preparation checklist

  • Confirm who will occupy each residential unit.
  • Gather commercial leases and residential tenancy agreements separately.
  • Check access, utilities and whether units have separate titles.
  • Ask your solicitor how land tax applies in your nation.
  • Review residential safety and compliance documents.
  • Consider how saleable the building is as a whole.
Questions

Common questions

Is a flat above a shop a commercial or residential mortgage?

Usually it is treated as mixed-use and assessed by specialist lenders, but occupation and borrower type can change the treatment.

Can I live in the flat?

Possibly, but owner or family occupation may bring the loan within mortgage regulation, which changes the process and protections.

Does the shop need to be let?

Not always. Owner-occupied and let commercial parts are both possible, with different evidence required.

Are mixed-use taxes different?

They can be. Check with a tax adviser for your nation and purchase.

Can I convert the flats later?

Changes of use may need planning permission and lender consent. Tell your lender before altering the property.

Is my home at risk?

If the building is your home and you fail to repay, the lender may repossess it. Consider this carefully.

Sources

Independent references

Research checked 21 October 2026. Third-party references for context; they do not review or endorse this page.

Who you could speak to

Graham Nash, Commercial Finance Director at Sorbus Finance

Graham Nash

Commercial Finance Director

Business loans, cash flow and wider commercial funding

Profile
Arran Turner, Managing Director at Sorbus Finance

Arran Turner

Managing Director

General commercial finance and how Sorbus works

Profile
  1. STEP 1

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  3. STEP 3

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  4. STEP 4

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