How BTL Mortgages Differ from Residential
Buy-to-let mortgages are assessed primarily on the rental income the property will generate, rather than your personal salary. Lenders apply a rental coverage ratio — typically requiring rent to be at least 125% to 145% of the mortgage payment at a stressed interest rate.
Deposits are higher, usually a minimum of 25% of the property value, compared to 5% to 10% for residential mortgages. Interest rates are also typically higher, reflecting the greater risk lenders associate with investment properties. Most BTL mortgages are offered on an interest-only basis, though repayment options are available.
Types of BTL Mortgage
The main types are fixed rate, tracker, and discounted variable. Fixed-rate BTL mortgages lock in your rate for a set period — two and five years are most common — giving you certainty over your costs. Tracker rates follow the Bank of England base rate, rising and falling with it.
Discounted variable rates offer a reduction on the lender's SVR for an initial period but can change at the lender's discretion. Each type suits different strategies: fixed rates are popular with landlords who value predictability, while trackers can offer lower initial costs if you believe rates will remain stable or fall.
Eligibility Requirements
Most BTL lenders require you to be at least 21 (some say 25), own your own home or have previously been a homeowner, and have a minimum personal income of £25,000 per year — though some lenders have no minimum income requirement if the rental coverage is strong enough.
Your credit history will be checked, and lenders will assess your overall financial position, including existing mortgage commitments. If you own four or more mortgaged buy-to-let properties, you are classified as a portfolio landlord and face additional scrutiny under Prudential Regulation Authority (PRA) rules.
Fees and Costs
BTL mortgage fees tend to be higher than residential equivalents. Arrangement fees typically range from £1,000 to £2,500, and you may also pay valuation fees, legal fees, and broker fees. Some lenders offer fee-free products, but these usually come with a higher interest rate.
When comparing deals, calculate the total cost over the product period, including all fees. A broker can model this for you and identify the most cost-effective option based on your loan size and how long you plan to keep the deal.
Important: Your home may be repossessed if you do not keep up repayments on your mortgage. There will be a fee for mortgage advice. The actual rate available will depend on your circumstances. Think carefully before securing other debts against your home.