UK house price growth halves as market loses momentum

UK house price growth halved to 0.8% in September, according to Nationwide, as the housing market lost further momentum against a backdrop of higher mortgage pricing and economic uncertainty.

Prices fell by 0.2% month on month after seasonal adjustment, reversing August’s 0.2% rise. Nationwide’s non-seasonally adjusted average UK price also slipped from £275,465 in August to £274,251 in September.

The 0.8% annual rise was the weakest since December 2025. Reuters reported that economists had expected annual growth of 1.3% and no monthly change, so both readings were softer than the consensus forecast.

That matters beyond the mortgage market. Government is pushing for more housing delivery at the same time that recent evidence points to a weaker planning pipeline, longer planning journeys for some schemes and tighter conditions for smaller housebuilders. A softer sales market is another part of that picture, but it is important not to turn one house-price index into evidence of a development viability problem that Nationwide has not measured.

UK house price growth slows as borrowing costs weigh on demand

Nationwide’s September House Price Index says market activity and prices have remained subdued in recent months. Chief economist Robert Gardner said “Market activity and house prices have remained subdued in recent months”, linking the weakness partly to an uncertain economic backdrop, including geopolitical tensions, higher energy prices, inflation concerns and expectations that Bank Rate could rise.

Those expectations matter because market interest rates feed through into mortgage pricing. Gardner said they had maintained upward pressure on the rates that underpin mortgages, while the effect of higher borrowing costs has partly offset the improvement in affordability created by earnings growing faster than house prices.

There was still a more positive strand in Nationwide’s assessment. Gardner said underlying affordability was improving and suggested activity could regain momentum if the energy shock fades, confidence returns and market rates fall back. That is Nationwide’s outlook rather than a guarantee of recovery.

The surprise element is also worth noting. Reuters reported that the 0.8% annual rise undershot its economist poll of 1.3%, while the 0.2% monthly fall was weaker than the flat reading expected by the poll.

A sharp regional split sits behind the UK average

Nationwide’s quarterly regional figures cover the three months to September, so they should not be confused with the monthly UK headline series. The quarterly series shows UK annual growth of 1.2% and an average price of £276,157, compared with the monthly September figures of 0.8% and £274,251.

Northern Ireland remained the strongest part of the market, with prices up 5.9% year on year in Q3. The North West followed at 3.9%, while Scotland and the North each recorded 3.3% growth.

Nationwide calculates that average prices across Northern England were 1.6% higher than a year earlier. Southern England was down 0.1%, and London was the only southern region to record annual growth, at 0.4%.

The North West was the strongest English region at 3.9%. At the other end of the table, East Anglia recorded a 0.7% annual fall, with the East Midlands down 0.5%, the South West down 0.3% and the Outer Metropolitan area down 0.2%.

The pattern matters for development because UK house price growth can hide very different local sales conditions behind a single national average. It would still be wrong to jump from those price movements to a conclusion about the viability of an individual scheme. Local values, absorption rates, build costs, finance, affordable housing requirements and other site-specific factors all matter.

Terraced homes outperform flats as property types diverge

Nationwide also found that every main property type saw slower annual growth in Q3. Terraced homes were strongest, rising 1.8% year on year, while flat prices were essentially unchanged.

The longer-term gap is more striking. Since the start of 2020, Nationwide says the price of a typical flat has risen by around 14%, compared with about 31% for semi-detached homes. The building society points partly to regional effects, because London has a much higher proportion of flats and has underperformed the wider UK market.

For planners and developers, the figures are useful context rather than a design instruction. The split in UK house price growth shows that demand and price performance are not uniform across housing types. It does not prove that one form of development will be more viable than another on a particular site.

Market reaction points to caution rather than a crash

Industry reaction published on 1st October broadly focused on borrowing costs and buyer caution rather than suggesting the market was in freefall.

Property Reporter quoted Tom Bill, head of UK residential research at Knight Frank, saying rising mortgage rates were “taking their toll on demand”. He expects that pressure to continue through the final quarter and said transaction volumes are likely to feel the squeeze.

The same report quoted Nathan Emerson, chief executive of Propertymark, saying many consumers were taking a “more cautious approach” to household finances as affordability pressures influenced decisions about buying and selling.

That distinction matters. September’s 0.2% monthly fall is small, and the annual measure is still positive. The evidence is of lost momentum and a widening regional split, not a nationwide house-price crash.

Housing delivery faces a different set of pressures

The Nationwide figures land at an awkward time for the wider housing-delivery agenda. Planning Geek has recently reported that the housing planning pipeline has fallen sharply, while separate Savills analysis found planning delays approaching 12 months are squeezing SME housebuilders.

Those are different datasets measuring different problems. The pipeline story is about the volume of permissions and approved schemes. The Savills analysis is about the time and finance burden involved in getting schemes through planning. Nationwide is measuring house prices based on its mortgage lending.

They should not be blended into one causal claim. Lower house-price growth does not, by itself, prove that development viability has worsened or that fewer homes will be built.

What it can do is change the commercial background against which schemes are assessed. Developers and lenders will watch achieved sales values, sales rates, incentives, mortgage availability and regional demand alongside land cost, build cost, finance and planning obligations. If assumptions move, the effect has to be tested at scheme level rather than inferred from a national index.

That is especially relevant where a policy push for more housing relies on private-market demand to absorb a large share of new supply. A planning permission is not the same thing as a sale, and a sales slowdown is not the same thing as a planning failure.

What to watch next

Nationwide’s September data leaves the market in a softer position going into the final quarter. Annual growth has halved, monthly prices slipped, regional differences have widened and flats continue to lag other property types.

But there are two counterweights. Earnings have been growing faster than house prices, which Nationwide says is improving underlying affordability, and the building society believes activity could recover if energy pressures and market interest rates ease.

For Planning Geek readers, the key point is not to use September’s UK house price growth as a shortcut for the health of housing delivery. It is one more piece of evidence showing that the market into which new homes must eventually be sold is uneven and sensitive to borrowing costs, at the same time that the development system is dealing with planning, finance and pipeline pressures of its own.