This is a direct-only deal and not available through brokers. As well as responding to wider wholesale market costs, lenders can raise mortgage rates to control business volumes. Yorkshire building society has announced it is raising the cost of selected mortgage deals from today, as Santander’s new higher rates also kick in, writes Jo Thornhill. The lender hiked its fixed rates up by 0.35 percentage points at the end of April, along with a swathe of other lenders increasing fixed rate costs .