Key Highlights

  • Zoopla data reported in August 2026 shows roughly four in five flats Fail to sell within six months, versus around half of properties market-wide.
  • Average leasehold service charges reached £2,405 a year in 2025, up 55.6% over a decade, with 37% of flats now above 1% of property value.
  • The house-flat price gap reached a 30-year high in Zoopla's February 2025 index, with houses valued around 67% above flats.
  • Key leasehold reforms, including 990-year Lease extensions and service charge transparency, remain incomplete, with a critical consultation closing 23 September 2026 and full implementation not expected before 2027.
  • Average two-year and five-year fixed Mortgage rates stood near 5.6% in August 2026, adding to affordability pressure on flat buyers facing rising running costs.

The gap between Britain's flat market and its house market has become one of the clearest divides in UK property. Research from Zoopla reported in mid-August 2026 finds that roughly four out of five flats put up for sale in England fail to find a buyer within six months — a far higher failure rate than for houses, reflecting rising service charges, tighter mortgage underwriting, lingering building-safety concerns, and a leasehold system many buyers now actively avoid.

For a housing market already showing signs of broader softness — Rightmove reported average asking prices down 2% month-on-month in August 2026, the steepest seasonal fall since 2018 — the flat sector bears a disproportionate share of the strain. Zoopla's Richard Donnell has been blunt about conditions in parts of the flat market.

What Happened?

Zoopla's research, covering the sales market through summer 2026, found that typically around half of all listed properties fail to find a buyer within six months. For flats specifically, that rate rises to roughly 80%. The figures point to a market in which flats — concentrated in cities and disproportionately sold leasehold in England — struggle far more than houses to attract buyers, even when competitively priced.

This is not entirely new. Zoopla's house price index from February 2025 had already flagged the price gap between houses and flats at a 30-year high, with average house values around 67% above average flats — £319,500 versus £191,300. Buyers increasingly cited running costs, including service charges and ground rents, plus fire safety concerns on some newer flats, as reasons to favour houses despite the price premium.

Rightmove's August 2026 index adds detail: London, where flats dominate housing stock, recorded the steepest annual price decline of any region, down 3.1%, while the North West, dominated by houses, posted the strongest growth at 1.9%. A London flat typically takes 73 days to find a buyer against 52 days for a terraced house in the North East, with flats more often needing price reductions.

The Numbers

Rising service charges are central to the story. Data from estate agent Hamptons shows average annual service charges on leasehold flats reached £2,405 in 2025 — roughly £200 a month — up 4.6% on the year, 32.6% over five years and 55.6% over a decade. In London, charges average £2,801, up 6.4% year-on-year. More than a third of flats (37%) now carry charges exceeding 1% of property value annually, a threshold that can affect both lender risk assessments and buyer appetite. A key driver is building age: much of the flat stock is around 30 years old and needs major works such as roofs, lifts and windows, on top of building-safety remediation still affecting some blocks since the Grenfell Tower fire and cladding crisis.

Mortgage conditions add further constraint: average two-year fixed rates stood around 5.61% and five-year fixed rates around 5.64% in August 2026, per Moneyfacts, with the best available rates closer to 4.3–4.4% for well-qualified borrowers. Lenders remain selective on flats in buildings affected by safety concerns, sometimes requiring an EWS1 external wall fire review before agreeing a mortgage, though the number of buildings still awaiting remediation has fallen from its post-Grenfell peak.

Leasehold reform remains a work in progress. Regulations from 31 January 2025 removed the previous two-year ownership requirement before leaseholders could extend a lease or buy their freehold, and further Right to Manage changes took effect 3 March 2025. But the centrepiece reforms — 990-year lease extensions at peppercorn ground rent, and new service charge transparency rules — depend on secondary legislation still being finalised; a consultation on the technical rates underpinning lease extension costs does not close until 23 September 2026, and service charge transparency is not expected before 2027. A further bill to ban new leasehold flats in favour of commonhold remains in draft.

Why It Matters

For sellers, an 80% six-month failure rate means pricing correctly — or accepting a longer, uncertain process — is now the norm, with knock-on effects for anyone relying on a flat sale to fund a house purchase. For first-time buyers the picture is mixed: the widening flat-house price gap makes flats comparatively more affordable, but the same running-cost concerns that deter existing owners also weigh on new buyers, particularly where service charges rise faster than wages.

The slow pace of leasehold reform compounds the uncertainty. Until the technical detail behind lease extension costs and service charge transparency is finalised, buyers and lenders have only partial visibility into how leasehold costs and rights will evolve — itself likely contributing to caution around flats specifically.

Investor & Market Perspective

For landlords, the flat market's struggles cut both ways. Lower flat prices relative to houses can present opportunities for yield-focused investors, particularly in city centres where rental Demand remains firm even as sales demand has weakened. But the same service charge and safety factors depressing owner-occupier demand also hit landlords, who must Factor rising, often unpredictable charges into net yield, and who face the same lender caution on affected buildings.

Housebuilders with significant flat-led pipelines, particularly in London, are navigating slower absorption rates for new-build flats, adding pressure on build-to-rent as an alternative disposal route. Listed housebuilders weighted toward houses have generally reported more resilient demand than those focused on urban flat schemes.

What Happens Next?

The most consequential near-term development is the conclusion of the government's consultation on lease extension deferment and Capitalisation rates, closing 23 September 2026, which will determine the practical cost of extending a lease under the new regime once secondary legislation follows. Service charge transparency rules are expected to phase in from 2027, which could gradually improve buyer confidence if delivered on schedule, though the timeline has already slipped. Analysts will also watch whether the "mini bounce" in buyer demand Rightmove reported following July's change of Prime Minister proves durable, and whether Bank of England rate decisions through autumn — including 17 September — feed through to mortgage pricing in time for the busier autumn selling season.

Outlook

The scale of unsold flat inventory in England — roughly four in five failing to sell within six months on Zoopla's figures — reflects a market that has not resolved the combined legacy of the cladding crisis, rising leasehold service charges, and a reform programme still years from full implementation. Houses have proven comparatively resilient through 2026's price softness; flats have not. Until service charge transparency improves, remaining safety issues are resolved, and leasehold reform delivers the certainty promised by the 2024 Act, the flat market looks set to remain the weakest part of UK housing.