UK mortgage rates rise looks inevitable after this week’s gilt sell-off pushed five-year swap rates above 4.52%, their highest since October 2023, forcing lenders to begin repricing fixed deals upward. The adjustment has already started: Coventry Building Society became the first mainstream lender to raise rates across its entire fixed-rate range for new and existing residential and buy-to-let borrowers following the sell-off.
According to Moneyfacts data reported by El-Balad, the average five-year fixed residential mortgage rate has already climbed to 5.68% and the average two-year fixed rate to 5.63%, with HSBC and NatWest among the major lenders to have increased rates since the start of September. Analyst Rachel Springall at Moneyfacts noted that some products had been pulled from the market by lenders in the process of repricing.
This is not the first time borrowers have faced this cycle in 2026. In July, Money To The Masses reported that more than 25 lenders, including Barclays, HSBC, Nationwide and NatWest, raised selected mortgage rates following a sharp rise in swap rates. September is shaping up as a rerun, and potentially a sharper one.
How Bad Is the UK Mortgage Rates Rise Likely to Be?
Tom Simpson, managing director of homes at Yorkshire Building Society, told Radio 4’s Today Programme: ‘All things being equal, you would expect a modest increase in mortgage rates based on what we’ve seen so far.’ He added context that matters: ‘A 0.1 [percentage point] increase, which is what we’ve seen over the last week, is much less of an increase than when we saw a 0.5 [percentage point] increase in 10 days in March when the Iran war broke out.’
That is reassuring, up to a point. The Guardian reports that swap rates are nonetheless 0.7 percentage points above where they were a year ago, according to Simpson’s own figures. The cumulative pressure matters more than any single weekly move.
The trigger for this week’s spike is the oil market. The US and Iran exchanged fire for the first time in a month during the week of 3 September, renewing fears of sustained inflation and sending Brent crude to an intraday high of $97 a barrel on Wednesday, before pulling back to $94.57 on Thursday morning. Higher oil prices mean higher inflation expectations; higher inflation expectations mean bond investors demand more yield to hold long-duration debt.
On Wednesday, 30-year UK gilt yields climbed above 5.92%, their highest since 1998, and 10-year gilt yields rose above 5.29%, their highest since 2008, according to Express. By Thursday morning both had retreated: the 10-year yield dropped more than 4 basis points to 5.195% and the 30-year fell to 5.831%. Relief, but not resolution.
AJ Bell investment director Russ Mould made the transmission mechanism plain: ‘Credit card, mortgage and auto loan interest rates will rise if bond yields rise, as the lenders seek to preserve loan book margins and manage their risk.’ That is a problem for any politician promising relief on the cost of living.
Compounding the political pressure, Bank of England chief economist Huw Pill used a speech on Thursday to argue for acting ‘clearly, promptly and decisively’ on rates rather than adopting a ‘wait and see’ approach. Pill was one of three Monetary Policy Committee members who voted for a rate rise at the July meeting, according to the AOL report. A central banker publicly ruling out patience is not the backdrop borrowers were hoping for.
Crest Nicholson Bears the Brunt of Subdued Housing Demand
The consequences of a high-rate environment are already visible at Crest Nicholson, whose shares fell more than 12% to a record low on Thursday after a profits warning, the company’s third guidance cut since April, according to BigGo Finance.
The London Stock Exchange trading update (RNS) puts revised full-year completions at 1,350 to 1,400 homes, narrower than the range cited in some early reports. The company now expects a loss of around £10m on an EBIT basis, against a previous target of a £5m to £10m profit. Crest’s financial year ends on 31 October, and negotiations with lenders over revised debt covenants are taking longer than expected, though year-end net debt is forecast to be around £30m better than previously guided, owing to fire remediation recoveries and land sale revenues.
Anthony Codling of RBC Capital Markets put the completions shortfall bluntly: ‘Challenging market conditions will see Crest Nicholson sell 50-100 fewer homes this year than it had previously guided, small numbers which will have a big impact on financial performance, turning small profit into a small loss.’ Barratt and Persimmon both fell 1.4% in sympathy.
The FTSE 100 itself was almost unmoved, down just 3 points to 10,752. But the bond market is setting the real agenda. If swap rates stay elevated through October, lenders will keep repricing, and Crest Nicholson’s demand problem will be shared across the entire sector.
