Cash-back mortgages are often aimed at first time buyers and the mortgage lender will offer a lump sum of cash at the start, or sometimes at an agreed point during the term, of your mortgage.
Usually the cash-back is offered as a package of benefits (e.g. linked with a discount) but pure cash-back mortgages are not uncommon. Mortgage lenders may offer a sum of money towards the cost of legal fees or survey charges. This could be, for example, £200 to £1000 as a flat amount, or a percentage of the mortgage loan.
In return, you typically have to agree to take the mortgage lender's standard variable mortgage rate.
Cash-back mortgages often have an early repayment charge which varies between lenders. Usually, these apply for a set period of time e.g. 2 or 3 years; however there may be some cash-back mortgages which have longer early repayment charges.