The cashback will be paid automatically on completion and sent to the conveyancer with the completion funds.
Remortgage customers can also benefit from having their basic legal fees and standard valuation costs paid for by the bank.
Ian Wilson, Head of Halifax Intermediaries, said: “The costs involved in buying, moving home or remortgaging can be significant, during what can be a stressful time. With our latest cashback offer we’re looking to help borrowers with some of these costs.”