There is no fixed limit on how many buy to let mortgages in Durham you can have. Some landlords own a single rental property, while others gradually build much larger portfolios over time.
The number of buy to let mortgages available to you will usually depend on your income, rental profits, existing borrowing, and the lender’s own criteria. Some lenders become more cautious once landlords own several properties, while others are far more comfortable working with experienced portfolio landlords.
As your property portfolio grows, lenders often carry out more detailed affordability checks before approving additional borrowing.
When are you classed as a portfolio landlord?
Most lenders classify landlords with four or more mortgaged buy to let properties as portfolio landlords.
Once you reach this point, lenders may look beyond the new property you are buying and assess your wider portfolio as a whole. This can include reviewing your mortgage balances, rental income, and the overall performance of your existing properties.
Lenders may also consider your experience as a landlord and how your properties are currently being managed.
Can you use different buy to let lenders?
Yes, many landlords spread their mortgages across multiple lenders instead of using the same lender for every property.
This can sometimes provide more flexibility when expanding a portfolio, especially if one lender has restrictions around borrowing limits or property numbers.
Some lenders are much more flexible with experienced landlords, particularly where larger portfolios or more complex income structures are involved.
Speaking with our mortgage advisors in Durham before applying can help you understand which lenders may suit your plans.
Does rental income affect future borrowing?
Rental income plays a major role when applying for further buy to let mortgages in Durham.
Lenders usually check whether the rent being received across your properties comfortably covers the mortgage payments. They may also factor in landlord costs such as insurance, maintenance, and possible void periods between tenants.
Strong rental income can improve your chances of being accepted for additional borrowing, especially if your existing portfolio is performing well.
Is it harder to get more buy to let mortgages?
As your portfolio grows, mortgage applications can become more detailed.
Lenders may ask for additional documentation, including tenancy agreements, mortgage statements, and evidence of rental income. Some lenders also apply limits on the number of properties they are willing to support.
There are still many lenders that actively work with experienced landlords who are continuing to grow their portfolios.
Date Last Edited: May 27, 2026
