Commercial Mortgage vs Buy-to-Let Mortgage
Commercial mortgages fund business premises, commercial investments and mixed-use property. Buy-to-let mortgages are generally designed for residential property let to tenants. The property and its intended use will normally determine which mortgage category applies.
Commercial mortgage
Normally used for offices, shops, warehouses, industrial buildings, trading premises, commercial investments and properties containing a meaningful commercial element.
Buy-to-let mortgage
Normally used for residential houses or flats that will be let to tenants rather than occupied by the borrower or their family.
Does the borrower choose the mortgage type?
Not entirely. Unlike comparisons where several products can meet the same requirement, the correct mortgage category will usually follow the property type and its intended use.
A standard residential home being purchased solely for rental will normally require a buy-to-let mortgage. A shop, office, warehouse or industrial unit will normally require commercial property finance.
Owner-occupied business premises, such as a company buying its own office or warehouse, normally fall within commercial mortgage lending rather than buy-to-let.
A property containing residential and commercial accommodation, such as a shop with a flat above, may require a semi-commercial or mixed-use mortgage.
Correct classification matters because lenders use different affordability tests, valuation methods, tenancy assessments and underwriting processes for each property type.
Commercial and buy-to-let mortgages explained
What is a commercial mortgage?
A commercial mortgage is longer-term borrowing secured against commercial, mixed-use or certain specialist investment property.
Potential uses can include:
- Owner-occupied business premises
- Offices and professional premises
- Retail shops and units
- Warehouses and industrial buildings
- Commercial investment property
- Hospitality and leisure premises
- Semi-commercial or mixed-use property
Underwriting may focus on the trading business, property income, tenant, lease and wider security position.
What is a buy-to-let mortgage?
A buy-to-let mortgage is secured borrowing designed for residential property which will be rented to tenants.
Potential property types can include:
- Residential houses
- Self-contained flats
- Residential portfolios
- Some houses in multiple occupation
- Some multi-unit freehold blocks
- Limited-company residential investments
Lenders normally assess expected rental income, mortgage payments, property type, landlord experience and borrower circumstances.
Commercial mortgage vs buy-to-let mortgage
| Feature | Commercial mortgage | Buy-to-let mortgage |
|---|---|---|
| Property type | Commercial, mixed-use or specialist property | Residential property let to tenants |
| Property use | Business occupation or commercial investment | Residential letting rather than borrower occupation |
| Underwriting approach | Commonly bespoke and assessed case by case | Commonly more standardised for conventional residential property |
| Affordability | Trading performance, commercial rent or both may be assessed | Rental cover and stressed mortgage payments are commonly assessed |
| Tenancy focus | Commercial tenant, lease strength and covenant may matter | Residential tenancy, achievable rent and tenant arrangements matter |
| Valuation | May consider property type, trading use, rent and investment value | Normally considers residential value and market rent |
| Owner occupation | Can fund premises occupied by the borrower's business | Generally not intended for occupation by the borrower |
| Mixed-use property | May be funded through semi-commercial lending | Standard buy-to-let criteria may not apply |
Swipe or scroll horizontally to view the full comparison table.
The central difference
Commercial mortgages finance business-use, commercial investment and mixed-use property. Buy-to-let mortgages finance residential investment property intended for letting to tenants.
Six important differences to consider
Property classification
Residential property normally points towards buy-to-let lending.
Commercial or mixed-use property normally requires commercial or semi-commercial underwriting.
Affordability
Buy-to-let lenders commonly assess whether rent provides sufficient cover for stressed mortgage payments.
Commercial lenders may assess business cash flow, commercial rent, lease terms or a combination of factors.
Tenant assessment
A commercial investment lender may examine the tenant's financial strength and lease obligations.
Buy-to-let underwriting commonly focuses on achievable residential rent and the suitability of the tenancy.
Borrower information
An owner-occupied commercial mortgage may require business accounts, management information and business plans.
Buy-to-let requirements can include income, landlord experience, portfolio information and rental data.
Lease structure
Commercial leases can differ significantly in term, repair, insurance, rent review and break provisions.
Residential tenancies operate under a different legal and regulatory framework.
Pricing and terms
Commercial mortgage pricing is often tailored to the individual borrower, property and transaction.
Standard buy-to-let products can be more readily comparable, though specialist property may require bespoke lending.
How is affordability assessed?
Commercial mortgage affordability
For owner-occupied premises, lenders may review:
- Historic business accounts
- Current management information
- Business cash generation
- Existing financial commitments
- Proposed mortgage payments
- Business plans and forecasts where appropriate
For commercial investment property, the tenant, lease and rental income may become central to the assessment.
Buy-to-let affordability
Lenders may review:
- Expected monthly rent
- Mortgage payment at the lender's stress rate
- Required rental coverage
- Borrower income where relevant
- Existing property portfolio
- Landlord experience
The precise rental calculation and stress test vary between lenders and products.
Property equity is not enough on its own. Lenders also need to be satisfied with the mortgage payments, rental income, business performance, property and wider transaction.
Owner-occupied vs commercial investment mortgages
Owner-occupied commercial mortgage
This can be used where a trading business purchases or refinances premises from which it operates.
Examples can include:
- A manufacturer buying its factory
- A retailer purchasing its shop
- A professional firm acquiring offices
- A logistics company purchasing a warehouse
- A hospitality business buying its premises
Commercial investment mortgage
This can be used where the borrower owns commercial property that is let, or will be let, to another business.
The lender may consider:
- Tenant financial strength
- Lease length and break clauses
- Current and market rent
- Property condition and location
- Void and reletting risk
What is a semi-commercial mortgage?
A semi-commercial property contains both commercial and residential accommodation. A common example is a retail unit with one or more flats above.
These properties may not meet standard buy-to-let criteria because a meaningful part of the building is used commercially.
A semi-commercial lender may examine:
- The proportion of commercial and residential space
- The use of the commercial element
- The commercial tenant and lease
- The residential rents and tenancies
- Access arrangements between the different areas
- The overall marketability of the property
- The borrower's experience
Do not assume the flat determines the mortgage category
A shop with a flat above will commonly need semi-commercial underwriting even where the residential rent represents an important part of the total income.
What about HMOs and multi-unit properties?
Houses in multiple occupation
Some HMOs can be funded within specialist buy-to-let lending, but criteria may depend on:
- Number of lettable rooms
- Licensing position
- Planning and lawful use
- Tenant profile
- Landlord experience
- Valuation methodology
Multi-unit freehold blocks
A building containing several self-contained residential units on one freehold title may require a specialist residential investment mortgage.
The appropriate lender will depend on the unit configuration, tenancy arrangements, title and valuation.
Specialist does not automatically mean commercial. Some complex residential investments remain within specialist buy-to-let lending, while mixed-use and business-use properties normally require commercial or semi-commercial finance.
How the choice can work in practice
Three different property purchases
Residential rental house
- Standard residential property
- Let to residential tenants
- No commercial use
- Rent supports lender calculations
A buy-to-let mortgage may be the appropriate category to explore.
Warehouse for a trading company
- Industrial property
- Occupied by the borrower's company
- Long-term business use
- Payments supported by business cash flow
An owner-occupied commercial mortgage may be appropriate to explore.
Shop with flats above
- Commercial retail unit
- Residential accommodation above
- Income from both elements
- Mixed property use
A semi-commercial mortgage may be the appropriate route to explore.
These examples are illustrative only. Mortgage availability remains subject to lender criteria, valuation, affordability, property use and the circumstances of the borrower.
Is a buy-to-let mortgage cheaper?
Standard buy-to-let products can be more readily comparable than commercial mortgage facilities, but the property must genuinely meet the lender's buy-to-let criteria.
Commercial mortgage pricing is often individually assessed according to the property, borrower, trading performance, tenant and lease.
A lower quoted rate does not make a product suitable for a property outside its permitted use.
Compare the following:
- The interest rate and repayment basis
- The required deposit or equity contribution
- Arrangement and lender fees
- Valuation and legal costs
- Broker fees where applicable
- Early repayment charges
- Interest-only or capital-repayment structure
- Rental coverage requirements
- Maintenance, management and insurance costs
- Potential void periods
- Refinancing flexibility
- The total amount payable over the intended term
Do not select a mortgage solely by rate. The product must match the property, intended use, tenancy and borrower's repayment capacity.
Do regulation and ownership structure matter?
The regulatory position can depend on the borrower, property, intended occupation and circumstances of the transaction.
Buy-to-let and commercial lending are not automatically regulated in every case. Borrowing connected with a property occupied by the borrower or their family can require different treatment.
The mortgage category is also separate from the ownership structure. A property may be purchased personally, through a trading company or through a separate property company, subject to lender criteria.
Obtain appropriate tax and legal advice. Personal, company and partnership ownership can have different tax, legal and commercial consequences. Shadowfax does not provide tax advice.
Commercial and buy-to-let mortgage misconceptions
“I can choose whichever mortgage has the lowest rate.”
No. The property type and intended use normally determine the suitable mortgage category.
“A commercial mortgage is only for owner-occupied premises.”
No. Commercial mortgages can also finance commercial property let to another business.
“A residential flat above a shop makes the entire property buy-to-let.”
Not usually. The commercial element commonly means semi-commercial underwriting is required.
“All HMOs require commercial mortgages.”
No. Some HMOs can be funded through specialist buy-to-let lenders. Property configuration, planning, licensing and lender criteria determine the appropriate route.
“Rental income guarantees mortgage approval.”
No. Lenders also assess property value, borrower circumstances, credit, tenancy arrangements and the wider transaction.
“Buying through a limited company makes the property commercial.”
No. Ownership structure and property classification are separate issues. A company can own residential buy-to-let property.
Information to prepare before approaching lenders
For a commercial mortgage
- Property address and intended use
- Purchase price or current value
- Deposit and required loan amount
- Business accounts and management information
- Existing financial commitments
- Tenant and commercial lease information
- Current and market rent
- Borrower and ownership structure
For a buy-to-let mortgage
- Property address and purchase details
- Expected rental income
- Deposit and required mortgage amount
- Existing property portfolio
- Landlord experience
- Proposed tenancy arrangements
- Licensing or planning information where relevant
- Personal or company borrower details
Key takeaway
A commercial mortgage normally funds business premises, commercial investment property or mixed-use property. A buy-to-let mortgage normally funds residential property let to tenants.
The property and its intended use usually determine the correct mortgage category. The borrower cannot normally select a buy-to-let product simply because its headline pricing appears more attractive.
The decision should consider property classification, tenancy, business or rental affordability, valuation, deposit, ownership structure and long-term investment strategy.
Not sure which mortgage category your property requires?
Shadowfax Funding Solutions can help review the property, intended use, rental or trading income, deposit and ownership structure before suitable lenders are approached.
Commercial mortgage vs buy-to-let mortgage FAQs
What is the main difference between a commercial mortgage and a buy-to-let mortgage?
A commercial mortgage normally funds commercial, mixed-use or business premises. A buy-to-let mortgage normally funds residential property which will be let to tenants.
Can I use a buy-to-let mortgage to buy a shop?
A standard buy-to-let mortgage is generally intended for residential rental property. A shop would normally require commercial property finance.
What mortgage is needed for a shop with a flat above?
A property containing meaningful commercial and residential elements will commonly require a semi-commercial or mixed-use mortgage.
Can a limited company obtain a buy-to-let mortgage?
Potentially. Limited-company buy-to-let products are available, subject to lender criteria, property type and the company structure.
Can a business buy its own premises with a commercial mortgage?
Potentially. An owner-occupied commercial mortgage may fund premises used by the borrower's trading business, subject to affordability, valuation and lender criteria.
How is commercial mortgage affordability assessed?
The lender may assess business trading performance, commercial rent, tenant strength, lease terms, existing commitments and the proposed mortgage repayment.
How is buy-to-let affordability assessed?
Lenders commonly assess the expected rent against a stressed mortgage payment and required rental coverage. Methods vary between lenders.
Does an HMO need a commercial mortgage?
Not always. Some HMOs can be financed through specialist buy-to-let products. The property size, use, planning, licensing and valuation can affect the appropriate route.
Which mortgage has the lowest deposit requirement?
Deposit and loan-to-value requirements vary between lenders, properties and borrowers. The correct product must first match the property's actual use.
Related property finance resources
This guide provides general information and does not constitute financial, mortgage, investment, tax or legal advice. Regulation, mortgage availability, valuation, affordability, pricing, property classification, deposit and repayment terms depend on the borrower, property, intended use and lender. Property may be repossessed if secured borrowing is not repaid. Shadowfax Funding Solutions Limited is a credit broker, not a lender.