If Rebecca decides to rent her flat out, a good starting point would be to speak to the Association of Residential Lettings Agents. They are a registered lettings agent, usually happy to visit a property and provide an estimated monthly rental figure, free of charge. Rebecca should then approach her mortgage lender and ask for consent-to-let. Her lender will look at several factors, including anticipated rental income, flat value and existing mortgage balance, before agreeing to this. Assuming Rebecca’s request is approved, her lender may allow her to remain on the current rate until it expires, or some may increase this rate, typically by an extra one per cent, to reflect the additional risk. After 2025, Rebecca could look at switching to a buy-to-let mortgage. While rates may be higher, she could switch to interest-only, to keep monthly payments down.