Technically, there is no fixed limit to the number of buy-to-let mortgages you can have. However, lenders will take your entire portfolio into account when assessing your risk as a borrower. Once you have a certain number of buy-to-let properties (commonly four or more), lenders might classify you as a "portfolio landlord." This status can trigger more stringent lending criteria and additional affordability assessments. Lenders will evaluate the viability of your entire portfolio, not just the property you are currently looking to finance. As your portfolio grows, managing multiple mortgages and the associated risks becomes more complex. Some lenders may have their own limits on the number of mortgages or the total amount they are willing to lend to a single borrower. Therefore, while there's no official maximum number, practical and lender-imposed limits will apply based on your financial circumstances and investment strategy.