UK mortgage rates set to rise as bond sell-off drives up borrowing costs – business live
UK mortgage rates are expected to increase following a global bond sell-off that has pushed up borrowing costs, despite a slight easing in bond yields at the start of trading.
Intelligence analysis by Gemini 2.5 Flash

The financial markets are signaling higher borrowing costs for UK consumers, particularly for fixed-term mortgages, as rising government bond yields translate into higher interbank swap rates. This comes amidst broader economic concerns, including a profit warning from housebuilder Crest Nicholson, highlighting subdued market conditions and affordability constraints.
Imagine banks need to borrow money to lend out for houses. The cost they pay to borrow that money, called 'swap rates,' has gone up because the government's own borrowing costs (like a big IOU) have also gone up. This means banks will likely charge more for house loans, making it more expensive for grown-ups to buy or keep their homes. It's like when the price of ingredients goes up, the price of your favorite snack also goes up.
Analysis
The UK economy is facing renewed pressure on borrowing costs, primarily driven by a global bond sell-off that has seen government bond yields surge. While there was a temporary reprieve with UK bond yields dropping slightly at the start of trading, the underlying trend points towards higher interest rates for consumers. This development is particularly concerning for homeowners and prospective buyers, as the increase in gilt yields directly influences the swap rates that banks use to price fixed-term mortgages.
Crest Nicholson
One immediate casualty of the challenging economic climate is UK housebuilder Crest Nicholson, which issued a significant profit warning. The company now anticipates making a loss this financial year, a stark reversal from its previous profit guidance. This downgrade is attributed to unexpectedly subdued market conditions during the summer, characterized by persistent affordability constraints and intense competitive pricing pressures.
Crest Nicholson has revised its forecast for home completions downwards, expecting to build 50-100 fewer homes than initially projected. This reduction, though seemingly small, is set to have a substantial impact on its financial performance, turning a modest anticipated profit into a loss of approximately £10 million on an EBIT basis. The company is also in the process of renegotiating its banking covenants, underscoring the severity of the market downturn.
5.195%
The yield on 10-year UK government bonds, or gilts, dropped to 5.195% at the start of trading, a slight retreat from the 18-year high recorded just yesterday. This movement, alongside a similar drop in 30-year bond yields, offered a momentary reassurance to borrowers and political leaders. The strengthening of bond prices, even if marginal, helps to push down the associated yield, which is the rate of return investors demand.
However, this minor dip does not negate the broader trend of elevated borrowing costs. The recent bond market turmoil has been exacerbated by factors such as high oil prices, which fuel inflationary pressures and could compel central banks to maintain or even raise interest rates further. The volatility in bond markets remains a critical indicator for the future direction of lending rates across the economy.
October 2023
The five-year swaps rate, a key benchmark for fixed-term mortgage pricing, recently surpassed 4.52%, reaching its highest level since October 2023. This surge in swap rates is a direct consequence of the rise in gilt yields, as banks factor in their own borrowing costs when setting mortgage rates. Experts anticipate that this will inevitably lead to higher interest rates on new fixed-term mortgage products.
While the current increase in swap rates is significant, some analysts, like Tom Simpson of Yorkshire Building Society, note that the magnitude of the rise is less severe than the rapid 0.5 percentage point jump observed in March, which coincided with the outbreak of the Iran war. Nevertheless, even a modest increase, such as the 0.1 percentage point rise seen over the past week, is expected to translate into higher costs for borrowers, impacting affordability and potentially undermining efforts to ease cost of living pressures.
Key points
- UK mortgage rates are expected to rise due to a global bond sell-off pushing up borrowing costs.
- UK five-year swap rates have hit their highest level since October 2023, indicating higher fixed-term mortgage rates.
- Housebuilder Crest Nicholson issued a profit warning, now expecting a loss this financial year amid 'subdued' market conditions.
- UK 10-year bond yields dropped slightly at the start of trading, easing from an 18-year high.
- A drop in Brent crude oil prices is seen as a factor helping to ease bond market turmoil.
The slight drop in UK bond yields at the start of trading and the fall in Brent crude oil prices offer a glimmer of hope that the bond market wobble could ease. If these trends continue, it might temper the expected rise in mortgage rates, providing some relief to borrowers and potentially stabilizing the housing market.
The persistent rise in bond yields and swap rates is set to push mortgage rates higher, exacerbating affordability constraints for homebuyers and increasing costs for existing homeowners. This could further depress the housing market, lead to reduced construction activity, and intensify cost of living pressures across the UK.



