Five mortgage lenders have increased their rates following recent volatility in the bond markets triggered by geopolitical tensions in Iran. This move comes as gilt yields spiked, pushing up the cost of borrowing for lenders and, in turn, mortgage rates for consumers. For property investors, the timing is unwelcome given the already challenging borrowing environment.
Our data at Prop AI Deals shows that mortgage rates had been stabilising over the summer after a series of hikes in 2025. However, this fresh round of increases—some by as much as 0.3 percentage points—reverses that trend. The immediate effect will be to raise monthly repayments and reduce cash flow for buy-to-let landlords, especially those on variable or tracker rates.
The bond market turmoil highlights the sensitivity of mortgage pricing to external shocks beyond domestic economic factors. Investors should expect further rate adjustments as lenders react to fluctuating gilt yields. Those locked into fixed deals will be insulated for now, but remortgaging costs will rise in the near term.
In this environment, property investors need to scrutinise their financing structures carefully. Stretching for higher yields in the current market could backfire if borrowing costs continue to climb. Conservative gearing and a focus on rental income resilience will be key to managing risk amid ongoing uncertainty.
Source: This is Money Mortgages
