Fixed mortgage rates in the UK have surged, with five lenders increasing their prices within a 24-hour period.
This represents the largest single-day spike in borrowing costs since the escalation of the conflict in Iran began in late March, signaling renewed volatility in the housing finance market.
The rapid repricing by lenders reflects a broader flight to safety among bond investors, who are reacting to the deepening geopolitical uncertainty.
As risk aversion rises, yields on government bonds tend to fall, but the transmission to mortgage products is often immediate and sharp as lenders adjust their risk premiums to protect margins against potential market dislocation.
This development reverses a period of relative stability that had briefly returned to the housing finance sector.
Earlier this week, US mortgage rates also jumped sharply as geopolitical tensions with Iran spooked bond investors, indicating that the repricing pressure is not confined to the UK but is a global phenomenon affecting fixed-income markets.
For homeowners and prospective buyers, the sudden increase in rates raises the cost of borrowing just as the market had begun to adjust to a new normal.