Santander customers are waking up Monday to unwelcome news after the lender quietly announced significant mortgage rate increases on Friday evening, changes that take effect Tuesday, March 17. The move has drawn sharp reactions from brokers, with one describing the hikes as a “sucker punch” and warning that “the bad news for borrowers just keeps piling up.”
The announcement marks another blow to homebuyers and remortgage customers who had grown cautiously optimistic through the early weeks of 2026, when sub-4% deals briefly appeared within reach. Instead, the market mood has darkened sharply, with multiple lenders repricing in rapid succession and raising fresh doubts about the direction of borrowing costs in the months ahead.
What the Rate Changes Mean for Borrowers
From Tuesday, Santander will increase rates across a wide range of products. According to the lender’s announcement, new business rates for first-time buyers, home movers, large loan customers, remortgage applicants, and buy-to-let borrowers will rise by up to 0.35%. Within its product transfer range, both residential and buy-to-let rates will increase by up to 0.30%.
Craig Fish, Director at London-based Lodestone Mortgages, offered a frank assessment of the week’s developments. “Just when brokers thought the worst was over, Halifax and Santander torpedoed the week,” he said. “We’ve had rate hikes across the board: new business, product transfers, buy-to-let, the lot.”
Fish pointed to surging swap rates, driven in part by Middle East tensions and a pullback in market expectations for Bank of England rate cuts, as the underlying force pushing lenders to reprice quickly. “Lenders are repricing fast and furiously to protect margins,” he said, adding that the sub-4% deals and cautious optimism of early 2026 had been “torched in a matter of days.”
Industry Voices Urge Borrowers to Act Without Delay
Despite the increases, some in the industry noted that Santander’s revised rates remain competitive in the current environment. According to Aaron Strutt, Product and Communications Director at Trinity Financial in London, “Santander has been offering many of the cheapest rates in the market for a while, so these price hikes were expected.”
Strutt acknowledged that even after the rises, Santander‘s fixed-rate products would remain “reasonably priced given everything that’s going on,” though he predicted that Nationwide, currently offering standout rates, would face similar pressure to raise its own pricing soon. He also offered a rare note of credit to Santander for its handling of the announcement. “It is good to see Santander gave borrowers the weekend and Monday to get applications,” he said, contrasting this with other lenders who have pulled products with very little notice.
Fish was more direct in his advice to anyone sitting on the fence. “The advice right now is simple: don’t wait, don’t speculate. Act.” The sentiment echoes a broader anxiety gripping the mortgage market, one that, for some brokers, feels uncomfortably reminiscent of the turbulence of 2022.
