The popularity of shorter-term fixed rates drove the changes, said the lender, which plans to cut its existing three-year 80% LTV by 15bps to 3.09%.
The Lifetime offset rate will also be cut by 20bps, said the lender.
Andy Gray, managing director of Mortgages for Barclays, said: “We’re extending our fixed rate borrowing terms by three months to ensure that any new customers coming on board receive the full benefit of the term they apply for.”