TL;DR
Buy to Let mortgage - key points
A Buy to Let mortgage is used to finance a property bought for rental. The bank assesses not only your financial situation, but also the investment potential, expected rent and whether the rent covers the mortgage payment with enough margin.
Most BTL purchases need a 20-25% deposit, and the mortgage can often be arranged personally or through an LTD/SPV. The best option depends on your strategy, tax position, exit plan and property type.
Before applying, it is worth checking whether the expected rent passes the rental stress test, whether a personal or LTD/SPV purchase is more suitable and whether the property fits lender criteria. This helps avoid applying to a bank that was never likely to fit the investment.
What is a Buy to Let mortgage?
A Buy to Let mortgage in the UK is a mortgage for buying or refinancing a property that will be rented out. Unlike a standard residential mortgage, the lender assesses not only the applicant’s finances, but also the expected rent, rental cover, property type, deposit and investor experience.
This means that mortgage affordability alone is not always enough. The lender may check whether rent is sufficient at a specific stress rate, what deposit you have, whether you already own property, whether your credit history fits criteria and whether you are buying personally or through a special purpose company.
As a broker, we help compare available routes and choose the option that fits your goal: first investment property, portfolio growth, refinancing, LTD/SPV purchase or improving cash flow.
Investor profile
Who is a Buy to Let mortgage for?
First Time Landlord
For people buying their first rental property. Some lenders accept this profile, but may apply extra requirements.
Experienced Landlord
For applicants who already have landlord experience and want to buy another investment property.
Portfolio Landlord
For investors with several properties. The bank may assess the full portfolio, cash flow, commitments and ownership structure.
Ltd / SPV
For clients considering a purchase through a special purpose company. This can affect tax and lending criteria, so it should be discussed with a broker and accountant.
If you are buying your first property in the UK and comparing a home for yourself with a rental investment, the First-Time Buyer guide may also be useful.
Lender criteria
Common Buy to Let mortgage requirements
Criteria vary between banks, but several areas usually need to be checked at the same time. This is why lender selection matters before submitting an application.
Deposit
Usually 20-25% of the property price. A higher deposit can increase product choice and improve terms.
Rental income
The bank checks whether expected rent covers the mortgage payment with enough margin. This is the rental stress test.
Income and credit history
Some lenders require minimum personal income, and credit history still matters.
Investor experience
Some banks prefer clients who already own property or have landlord experience.
Interest only or capital repayment?
Interest-only mortgages are popular in BTL because the monthly payment is lower and may improve cash flow. Capital repayment reduces the debt over time, but the payment is higher. The right choice depends on cash flow, tax position, sale or refinance plans and your risk tolerance.
Read about mortgage interest7 steps
What does the Buy to Let mortgage process look like?
- 1
Consultation and investment goal
We check whether you are buying your first rental property, expanding a portfolio or refinancing an existing BTL.
- 2
Deposit and rent analysis
We review deposit, expected rent, rental cover and basic affordability.
- 3
Agreement in Principle
If the case allows it, we obtain an Agreement in Principle and define a realistic purchase budget.
- 4
Property choice
You can search for a house or flat within the agreed budget and expected rental range.
- 5
BTL mortgage selection
We compare lenders, rates, fees, rental stress tests and conditions for a personal purchase or LTD/SPV.
- 6
Full application
We submit the application and coordinate documents, valuation and lender communication.
- 7
Offer and completion
After the Mortgage Offer, the solicitor completes the transaction and you can prepare the property for letting.
If you already own a rental property, remortgage can help review a product switch, another lender or raising funds, but it requires a fresh check of rental cover, property value and fees.
Broker support
Do you need an adviser for Buy to Let?
You do not have to use an adviser, but with BTL it is often practical. The market is more specialised, and lenders can take different views on rent, property type, LTD/SPV purchases, first-time landlords and portfolio landlords.
Access to many lenders
We compare banks and products, including options that are not always easy to assess directly online.
Investment strategy
We check whether a personal purchase, LTD/SPV, interest only or capital repayment route better fits your plan.
Lower application risk
BTL is often assessed more carefully than a standard residential mortgage, so document details matter.
Support in English or Polish
We explain the process clearly and guide you from the first conversation to a formal mortgage offer.
Buying personally or through an LTD/SPV?
A Buy to Let mortgage can often be arranged personally or through an LTD/SPV company. A company purchase is often considered by investors building a portfolio, but it is not automatically the best solution for everyone.
The difference can affect tax, company running costs, lender choice, interest rates, fees and how profits are taken. Before deciding, it is worth speaking to both a mortgage adviser and an accountant.
Our role is to show which mortgage options are realistically available in your situation and what terms banks may offer for a personal purchase or LTD/SPV.
FAQ
Frequently asked questions
How do banks calculate rental income for Buy to Let?
The bank usually checks whether the expected rent covers the mortgage payment with a suitable margin. This is called a rental stress test or rental cover. The exact level depends on the lender, stress rate, product type, taxpayer position and purchase structure.
Can I remortgage a Buy to Let property?
Yes. A BTL remortgage can be used to switch product, move lender, raise funds or improve terms after the property value has increased. Rental cover, current property value, mortgage balance, fees and any early repayment charge need to be checked.
How is Buy to Let different from a residential mortgage?
A residential mortgage is for a property you live in. Buy to Let is for a property rented to tenants. With BTL, the lender places more weight on rent, rental stress testing, property type and investor profile.
How much deposit do I need for Buy to Let?
Most Buy to Let mortgages need a 20-25% deposit. The exact amount depends on the lender, property type, expected rent, your situation and whether you buy personally or through an LTD/SPV.
Does a Buy to Let mortgage depend on my income?
Yes, but differently from a standard residential mortgage. The bank focuses heavily on rent and rental cover, but may also check personal income, commitments, credit history and investment experience.
Can I buy a Buy to Let through an LTD or SPV?
Often yes. Buying through an LTD/SPV can suit some investors, but it requires the right lender, structure and documents. It is worth discussing this with a mortgage adviser and accountant before applying.
Interest only or capital repayment - which should I choose?
Interest only is common in BTL because it reduces the monthly payment and can improve cash flow. Capital repayment reduces the debt over time. The best option depends on investment strategy, tax position and exit plan.
Can a First Time Buyer get a Buy to Let mortgage?
Some banks accept this, while others require you to already own a residential property. It is not one fixed rule across the market, so lender criteria should be checked before applying.