The cost depends on the mortgage amount, interest rate, term, deposit and whether you choose a repayment or interest-only deal. As an illustration, borrowing £200,000 over 25 years at 5% on a repayment mortgage would cost about £1,170 a month, excluding fees, and roughly £151,000 in interest if the rate stayed unchanged throughout. You may also need to budget for arrangement, valuation and legal fees, while fixed and variable rates can change your future payments differently. Compare the overall cost, including the APRC and fees, and check current deals with an FCA-authorised mortgage adviser or lender.