The cashback will be paid automatically on completion, and sent to the conveyancer alongside completion funds.
Halifax will also pay standard valuation costs and basic legal fees, helping customers save an average of £300.
Craig McKinlay, mortgages director of Halifax, said: “We are always working to find ways to help give customers extra and this new offer means homeowners can not only benefit from a dedicated mortgage adviser to guide them through the process, but also enjoy an extra £750 in the bank which could help make the summer a bit brighter.”
Borrowers applying for a remortgage deal through Halifax can get an Agreement in Principle within 15 minutes, without affecting credit history, by applying via their local branch, over the phone or online.