UK house prices unexpectedly fell by 0.1% in August 2025 to an average of £271,079 - a surprise dip - despite the typical slowdown over the summer months, according to Nationwide Building Society’s latest data.
Economists had anticipated a 0.2% rise. On an annual basis, growth slowed to 2.1% from 2.4% in July - the slowest pace since June 2024.
Nationwide’s chief economist, Robert Gardner, says that stretched affordability remains a key drag, with first‑time buyers typically committing about 35% of their take‑home pay to mortgage repayments - well above the long‑run average of 30%.
“House prices are still high compared with household incomes, making raising a deposit challenging for prospective buyers, especially given the intense cost of living pressures in recent years,” says Gardner.
He adds: “Combined with the fact that mortgage costs are more than three times the levels prevailing in the wake of the pandemic, this means that the cost of servicing a mortgage is also a barrier for many.”
Despite the Bank of England cutting the base rate to 4% earlier in August, high mortgage rates continue to hold back buyer demand.
Why Budget speculation is cooling the market
Property market sentiment is being dampened by mounting speculation ahead of the upcoming autumn Budget.
Proposed tax measures include a new annual property tax on homes valued over £500,000; potential changes to capital gains tax on properties sold above £1.5 million; and possible taxes on landlords’ rental income.
These rumours are causing uncertainty among sellers and potential buyers alike creating significant uncertainty. This uncertainty is prompting a ‘wait and see’ approach from many who might be considering selling or buying.
Property portal Zoopla reports that a significant proportion of buyers, particularly in higher‑value regions such as London and the South East, are pausing decisions until clarity emerges.
Even though average house prices across the UK have still risen year‑on‑year (about 1.3%), activity is patchy, with the North showing stronger demand while southern markets lag.
What this means for the market
With growth decelerating and affordability stretched, anyone looking to move, whether to buy or sell, should speak to a mortgage broker to ensure they have a full picture of what they can afford.
A specialist can help secure the most competitive mortgage available, tailored to individual circumstances and current rates.
For those considering unlocking housing wealth, whether through remortgaging, selling or downsizing, it is also worth consulting a financial planner. They can provide options to help position your wealth for long-term sustainability and ensure tax liabilities are minimised in light of potential Budget changes.
House-price growth is slowing, affordability remains stretched, and future tax proposals are casting a shadow over the market. In uncertain times, expert guidance from a mortgage broker for financing and a financial planner for wealth and tax strategies is more important than ever.