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The average interest rate across outstanding UK mortgage balances reached 4% at the end of August 2026, twice the 2% recorded in December 2021, according to Bank of England data. Mortgage approvals for house purchases fell below 55,000 in August, while lenders have recently raised rates on new deals. The causes of the housing market slowdown are multiple, and the scale and timing of any further rate changes remain uncertain.
The average interest rate on outstanding UK mortgages reached 4% at the end of August, double its level in December 2021, according to Bank of England data. The figure covers existing mortgage balances as well as new loans, and came as approvals for home purchase mortgages fell to just under 55,000, their lowest monthly total since December 2023.
The Bank of England’s measure of interest paid across all outstanding mortgage balances stood at 2% in December 2021 and reached 4% in August 2026. The source report says this specific series has not recorded a higher rate since data collection began in 2016. A similar earlier data set showed the average outstanding mortgage rate last above 4% in February 2009, though the series are not identical.
Rates on new loans are higher than the average across the existing mortgage stock. Moneyfacts put the average rate on a new two-year mortgage at 5.91% at the time of the report. In December 2021, some mortgages were offered at rates as low as 1.1%, according to the report. Those figures refer to different measures: an average rate on a current new two-year loan and a low rate previously available.
The Bank’s August figures also showed just under 55,000 purchase mortgage approvals, marking a fourth consecutive month below 60,000. Savills analysis cited by This Is Money counted 33,086 fewer approvals in the four months to August than in the same period a year earlier, a 13% decline. The report links weaker activity to costlier borrowing, uncertainty, the end of stamp duty incentives and pressure on the housing market.
Higher Rates Restrain Home Moves
The rise matters because the 4% figure reflects borrowing costs across mortgages already in force, not just the prices lenders are quoting to new customers. As fixed-rate deals expire, households may have to refinance at rates above those on their previous loans. The effect on each borrower depends on the size of the loan, the remaining term, lender offers and when their current deal ends.
Higher rates can also make it harder for buyers to borrow enough to move or purchase a larger home. Savills residential research head Lucian Cook said recent mortgage-market volatility had made taking on a bigger mortgage more expensive. He said upsizers were delaying plans until they had more confidence in their finances and ability to service additional debt.
Fewer approvals can signal weaker prospective housing transactions, although an approval does not guarantee a completed purchase. The figures point to subdued activity rather than establishing that mortgage costs alone caused it. The report also cites housing-market conditions, uncertainty and the removal of stamp duty incentives as contributing factors.
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From 2021 Cheap Deals to 2026
In December 2021, the average rate across outstanding mortgage balances was 2%, and some new mortgages were available at rates as low as 1.1%, according to the source report. The current 4% measure has risen over a period in which the cost of new borrowing has also increased, but it should not be confused with the rate offered to a borrower shopping for a mortgage today.
The report says lenders have raised rates in recent weeks amid inflation concerns linked to escalation of the war in Iran and renewed increases in energy prices. Sonia swap rates, which lenders use when pricing fixed-rate mortgages, have also risen, increasing banks’ costs of providing those loans. These factors describe the market backdrop cited by the report; they do not establish how much of the outstanding-rate increase each one caused.
The government announced its Your First Home scheme at the weekend before the report was published. Under the proposal as described, eligible first-time buyers could use a 2.5% deposit alongside an equity loan worth 20% of a property’s value. The report presents the scheme as an attempt to support the market, while a mortgage industry figure argued that borrowing costs remain the larger constraint.
““The weakness in these numbers reflects the recent volatility in the mortgage markets, which have made it more expensive for people to take on a bigger mortgage.””
— Lucian Cook, head of residential research at Savills
What the August Figures Cannot Show
The Bank of England data establish the average rate across outstanding mortgage balances at the end of August, but the reported figure does not show how individual households’ payments changed or how many borrowers face a higher rate when refinancing. Borrowers have different loan sizes, deal end dates and mortgage terms, so the average does not describe any one household’s position.
The approval count records loans approved for house purchases, not completed sales. It does not by itself establish why a buyer delayed or withdrew, or how many approvals will lead to transactions. The report cites several possible pressures, but does not quantify each factor’s contribution.
The source material also does not set out the precise method or coverage differences between the current data series, which begins in 2016, and the similar series used to compare with February 2009. It reports the new two-year mortgage average from Moneyfacts but does not specify a matching historical average for that product type. The future course of rates, inflation and energy prices is not established by these August figures.
Budget and Borrowing Costs Ahead
The government’s upcoming Budget is the next stated policy milestone in the report. Palmer called for action on borrowing costs, affordability and stamp duty. The source does not say whether the government will adopt those proposals or provide further details on the Your First Home scheme.
Mortgage-market activity will also depend on how lender pricing changes and whether borrowing costs improve for a sustained period. Gammon said a meaningful recovery in transaction volumes would likely require such an improvement. Subsequent Bank of England approval data and mortgage-rate figures will show whether the recent weakness and elevated rates persist, but the August report does not forecast when either trend may turn.
For people buying a home or nearing the end of a fixed-rate deal, the source advises exploring mortgage options early. Individual rates and eligibility vary, and the figures in this report describe market averages and historical offers rather than a guaranteed deal for any borrower.
Key Questions
What does the 4% mortgage rate measure?
It is the Bank of England’s reported rate across all outstanding mortgage balances at the end of August 2026. It includes existing loans and is not the rate offered to every new borrower.
How much did the average outstanding rate rise?
The reported average rose from 2% in December 2021 to 4% in August 2026. That is a doubling of the measure across that period, not a statement that every homeowner’s personal mortgage rate doubled.
What were new mortgage rates in the report?
Moneyfacts put the average rate on a new two-year mortgage at 5.91% at the time of the report. That product-specific average is different from the 4% rate across the outstanding mortgage stock.
Did mortgage approvals fall in August?
Yes. There were just under 55,000 approvals for house purchase, the lowest monthly total since December 2023, according to the Bank of England figures cited in the report. Approvals are not the same as completed purchases.
What happens to borrowers whose fixed deal is ending?
The report advises people whose current fixed-rate mortgage is due to end to explore their options early. The rate available will depend on individual circumstances and lender offers; the reported averages do not guarantee a particular borrower’s rate.
Source: rss
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