Mortgage Rates Climb as Iran Conflict Fuels Economic Uncertainty

UK mortgage rates have risen sharply in recent weeks, exceeding 5% for the first time in months, as escalating tensions in the Middle East and the ongoing conflict involving Iran inject volatility into financial markets. The increase is driven by concerns about rising inflation and a shift in expectations regarding future Bank of England interest rate decisions.

The Impact of Geopolitical Instability

The average two-year fixed mortgage rate reached 5.01% on March 18, 2026, up from 4.84% on March 6, 2026, according to Moneyfacts. This surge follows a period of relative stability, disrupted by US and Israeli airstrikes on Iran and the subsequent outbreak of conflict. The situation has triggered broader economic shocks, including declines in stock markets and increases in the price of petrol and heating oil, with warnings of further price increases for essential goods and services.

Understanding Swap Rates and Mortgage Pricing

A key factor driving up mortgage rates is the increase in swap rates. These financial instruments allow lenders to manage the risk associated with fluctuating interest rates. Banks employ swap rates to exchange fixed and variable interest rate payments, effectively hedging against potential rate hikes. When swap rates rise, it becomes more expensive for lenders to borrow money, and these costs are passed on to borrowers in the form of higher mortgage rates.

As Adam French, head of consumer finance at Moneyfacts, explains, lenders use their own funds and borrowed money at variable rates to provide mortgages. They then “swap” the interest rates on these cashflows for a fixed rate to manage risk. The Guardian reports that five-year swap rates increased to 4.03% on March 15, 2026, from 3.603% on March 2, 2026 – a significant jump.

The Decline of Sub-4% Mortgage Deals

The availability of sub-4% fixed-rate mortgages has plummeted. On March 12, 2026, only nine fixed-rate deals below 4% remained available, a dramatic decrease from the 490 deals available on March 9, 2026, according to The Independent. The overall number of mortgage products available has also decreased, with 689 fewer products on offer as of March 12, 2026, compared to March 9, 2026.

Impact on Borrowers

The rising rates translate to higher monthly mortgage payments for new borrowers. The Guardian estimates that a borrower with a £250,000 mortgage over 25 years will pay approximately £788 more per year on a two-year fixed rate, or £651 more on a five-year deal, compared to rates available just two weeks prior. Approximately 1.8 million fixed-rate deals are set to expire in 2026, meaning a large number of borrowers will face higher rates when they remortgage.

Bank of England and Future Outlook

The Bank of England’s next base rate announcement is scheduled for March 20, 2026. Expectations of a rate cut have diminished due to concerns about rising inflation. Rachel Springall, a finance expert at Moneyfactscompare.co.uk, suggests that if inflation jumps, the Bank of England may even consider increasing the base rate before the conclude of the year.

While swap rates have not yet reached the levels seen after the mini-budget in 2022, the current volatility underscores the sensitivity of mortgage rates to geopolitical events and economic forecasts. If the conflict in the Middle East de-escalates, swap rates and mortgage deals could potentially fall, but continued instability is likely to preserve upward pressure on borrowing costs.

Key Takeaways

• UK mortgage rates have surpassed 5% due to the conflict in Iran and broader economic uncertainty.
• Rising swap rates are a primary driver of higher mortgage rates.
• The availability of sub-4% mortgage deals has significantly decreased.
• Borrowers face higher monthly payments and increased financial pressure.
• The Bank of England’s future interest rate decisions will be crucial in shaping the mortgage market.