UK fixed-rate mortgage costs have resumed their upward march, even as the Bank of England holds its benchmark rate steady. According to property portal Rightmove, the average two-year fixed mortgage reached 5.13% on September 8, a weekly increase of 0.08 percentage points, while the five-year fix edged up 0.07 points to 5.15%. These figures, based on Podium data, underscore that borrowers who waited for the next policy meeting have not been shielded from the recent selloff in wholesale funding markets.
The climb is driven by swap rates—the key hedging instruments lenders use to price fixed-rate loans—rather than a change in Bank Rate, which has remained at 3.75% since December. Two-year swap rates jumped to 4.26% by September 3, up from 4.06% a month earlier, while five-year swaps rose to 4.36% from 4.16%, according to Moneyfacts data cited by Mortgage Solutions. The UK 10-year gilt yield also breached 5%. If lenders had kept retail prices unchanged, they would have seen their margins shrink as the cost of hedging rose.
In response, major banks have moved swiftly. Barclays raised rates on selected mortgage products by up to 0.18 percentage points, including a two-year 90% loan-to-value deal that now carries a 5.14% rate. Santander increased some rates by as much as 0.25 points, and HSBC repriced its residential and buy-to-let ranges. These coordinated adjustments highlight the industry-wide nature of the funding shock.
The impact is not uniform across borrowers. Rightmove's data reveals a significant gap between deposit tiers. For a borrower with a 5% deposit, the average two-year rate stands at 5.71%, compared with 5.28% for a 10% deposit and 4.67% for a 40% deposit. The five-year averages are 5.69%, 5.26%, and 4.71%, respectively. While the lowest advertised two-year rate remains at 4.34%, the overall average is now 0.61 percentage points higher than a year ago. On a £250,000 mortgage over 25 years, the shift from 4.52% to 5.13% translates into an additional £88 per month in repayments.
For bank stocks, the key question is whether higher pricing can offset weaker volumes. Lloyds Banking Group, the UK's largest mortgage lender and owner of Halifax, is the most direct play. The bank reported £7.3 billion in net interest income and a 3.19% net interest margin in the first half of 2026, while lending £8 billion to over 30,000 first-time buyers. If lenders can maintain pricing discipline, margins may hold up. However, higher rates could dampen demand, reduce refinancing activity, and slow house price growth, potentially undermining the volume side of the equation.
Barclays, HSBC, and Santander are more diversified, so UK mortgages represent a smaller share of their earnings. Still, their rapid repricing actions demonstrate that the funding pressure is systemic, not isolated to one institution.
The next major catalyst is the Bank of England's decision on September 17. Investors will scrutinize the vote split and commentary on inflation, but the trajectory of gilts and swaps may be more critical for mortgage pricing. If wholesale yields retreat, lenders could compete more aggressively on rates. If they stay elevated, further repricing is likely, with the heaviest burden falling on borrowers with small deposits. For bank shareholders, the outlook hinges on whether margin stability can be achieved without sacrificing loan growth—a delicate balance that will define the sector's near-term performance.
