Mortgage guide
Semi Commercial
Semi-commercial properties may qualify for buy-to-let interest rates, particularly when the majority of the asset is residential.
- Published
- 30 Mar 2026
- Last reviewed
- 11 Sep 2026
- Reading time
- 3 min
Semi Commercial
Semi-commercial properties may qualify for buy-to-let interest rates, particularly when the majority of the asset is residential. However, these properties often do not secure the same rates on portfolio re-mortgages as purely residential properties. In cases where you own semi-commercial assets alongside residential properties under the same ownership structure, it might be advantageous to segregate these assets. By applying for separate semi-commercial mortgages, we can potentially lower the costs associated with the residential portion of your portfolio.
At Mortgage Lane, as a leading portfolio mortgage lender and portfolio lender in the UK, we frequently evaluate whether it’s more cost-effective to consolidate all asset classes under one mortgage or to separate them into distinct facilities. While some portfolio landlords prefer consolidation for the simplicity it offers in the application process, splitting the assets into separate mortgage facilities is often more financially beneficial.
Our approach to portfolio lending UK is tailored to optimise your financial strategy, ensuring that you receive the best possible outcomes for your investment portfolio. Whether you choose to consolidate or separate your assets, our expertise will guide you through each step, maximising your benefits while minimising costs.
When managing a diverse property portfolio that includes semi-commercial assets, it’s often economically advantageous to isolate these properties from residential ones during the re-mortgage process. At Mortgage Lane, we specialise in structuring semi-commercial portfolio re-mortgages that cater specifically to the unique financial dynamics of these properties.
Isolate Commercial from residential
Isolating semi-commercial properties can lead to more favourable lending terms. By separating them from residential assets, we can target lenders who specialise in or offer better rates for semi-commercial lending. This strategic approach not only simplifies the lending process but can also result in more economical terms.
As a leading portfolio re-mortgage lender, we understand that each property type within your portfolio carries its own risks and returns. Our tailored portfolio lending UK solutions ensure that each asset is financed in a way that maximises economic benefits while minimising costs. This often means creating separate lending streams for residential and semi-commercial properties, allowing for more specialised, cost-effective lending solutions.
For mortgages for portfolio landlords, considering the separation of property types can be a crucial step in optimising the financial health of your portfolio. Whether you’re looking to expand, or simply enhance the profitability of your investments, Mortgage Lane is here to provide expert guidance and tailored mortgage solutions.
Buy-to-let calculator
Estimate one property at a time. Portfolio-wide underwriting is assessed separately.
For context, these are the wider product terms covered by this guide. Availability and eligibility depend on your circumstances and the lender.
| Feature | Detail |
|---|---|
| Maximum Loan to Value (LTV) | 80% LTV |
| Minimum Loan size | £40,000 |
| Mortgage Term | Up to 35 years |
| Interest rate | From 4.89% |
| Interest options | Fixed 2, 3 and 5 years, variable & base rate trackers |
| Experience requirement | None |
| Up front costs | Free valuation, Free legal representation |
| Broker fees | None |
| Completions | 4-12 weeks |
Portfolio landlord mortgage criteria
These wider product criteria provide context for this guide. The lender will assess your individual case.
| Criterion | How it works |
|---|---|
| Definition | Four or more distinct mortgaged buy to let properties, held alone or jointly, counted in aggregate across lenders (SS13/16). Lenders differ on whether the property being applied for counts and on how they count properties held in a limited company. |
| Assessment | A specialist underwriting approach that looks at the whole portfolio as well as the new loan, for banks and building societies under SS13/16. Other lenders set their own approach. |
| Property schedule | Every property: ownership, value, outstanding loan, lender, monthly payment and rent. |
| Stress rate | At least 5.5% over the first five years, or the fixed rate where it is fixed or capped for five years or more (SS13/16). On the cases we arrange, commonly around 5.5% on two-year fixes and around 4.5% on five-year fixes. |
| Portfolio stress test | Rent across the portfolio against stressed interest on all its loans, at the lender's ratio. In our experience commonly 125% for companies and basic-rate taxpayers and 145% for higher-rate personal borrowers. How the existing properties are tested varies by lender. |
| Aggregate loan to value | Some lenders cap the loan to value across the whole portfolio as well as on each loan, and the cap varies by lender. In our experience 85% is the ceiling on a buy to let loan. |
| Portfolio size and exposure | Some lenders cap the number of properties or their total lending to one landlord; others set no property limit. |
| Business plan and cash flow | Lenders following SS13/16 may ask for a business plan and the cash flows of every property. Requirements vary by lender. |
| Assets, liabilities and tax | A statement of assets and liabilities, and the income and tax position, including the tax on rental profit. |
| Ownership structure | Personal names, a limited company, or both. Companies and individuals are taxed differently on rental profit, which can change the rental cover a lender asks for. |
| Experience and conduct | The landlord's track record is reviewed, and arrears on any property are assessed with the rest of the credit file. |
| Regulation | Business buy to let is outside the FCA's mortgage rules. A loan to an individual on a property the borrower or a close relative lives in is a regulated mortgage contract. |
Related case studies
Frequently asked questions
What is a semi-commercial mortgage?
A semi-commercial mortgage is a loan on a property that combines commercial and residential parts, such as a shop with a flat above, and is also called a mixed use mortgage. Lenders assess the combined rental income, the residential proportion and the commercial tenant's lease, or the business where the owner trades from the premises, and it is usually arranged with commercial or specialist lenders. A loan to an individual or trustees is a regulated mortgage contract where at least 40% of the property, measured by floor area, is lived in by the borrower or a related person; otherwise it is usually unregulated business lending.
Can I get a semi-commercial mortgage on a lower income?
Yes. Some lenders are flexible on personal income where other aspects of the application are strong, particularly the rental income and the lease.
What property types qualify for a semi-commercial mortgage?
Any property mixing residential and commercial space can qualify, including shops, offices, pubs, cafes, takeaways, restaurants, medical and veterinary practices, garages, and kennels or catteries with residential accommodation.
What documentation is required for a semi-commercial mortgage?
Applications typically require proof of income, the property valuation, the commercial lease agreements, and supporting financial documents.
What loan-to-value is available on a semi-commercial mortgage?
Loan-to-value on a semi-commercial mortgage typically ranges from 60% to 75%. Lower loan-to-value cases are safer for the lender and can attract lower interest rates.
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