The Yorkshire Building Society Group lender will credit borrower’s accounts with £1,000 in their linked offset savings account until Friday 27 January.
The incentive will be paid into the customer’s linked offset savings account once they complete on their mortgage.
The cash can be withdrawn by the customer at any time, a spokeswoman confirmed.
The offer stands across the lender’s range, which includes a two-year offering at 2.14% at 75% loan-to-value (LTV) with no up-front fees and a free standard valuation.
David Robinson, national intermediary sales manager at Accord, said: “Our £1,000 offset boost has been a big hit with brokers and their clients so we have made the decision to extend the offer for another week.
“Borrowers are always looking for ways to make their money work harder, so by offering a range of competitive offset mortgages plus this added bonus we aim to help them to reduce the interest they pay on their home loan as much as possible.”
Accord initially launched the £1,000 incentive for a two-week period on Friday 6 January.