BLOGS

A tale of two property types

For much of the 2000s, flats and houses broadly tracked one another in price growth terms. City-centre apartments — particularly new-build ones in regeneration zones — commanded a premium that reflected their lifestyle appeal, proximity to employment hubs, and the convenience they offered younger, mobile buyers.

That consensus has unravelled.

According to Zoopla's research, the gap between average house and flat values across the UK has reached its widest point on record, with houses now commanding a premium over flats that has widened substantially since 2016. Land Registry price-paid data tells the same story: while detached and semi-detached houses have seen cumulative price growth well into the 30–40% range since 2016 in many regions, average flat prices have stagnated — or in some markets, retreated in real terms.

REalyse data across major urban markets confirms the divergence. In postcode districts from Manchester's M1 to Birmingham's B5, the spread between average sold £/sqft for houses and for flats has widened meaningfully over the past three to four years — a shift that is now feeding directly into developer appraisals and planning policy conversations.

What drove the divergence?

The roots of this gap run deep, and several forces have compounded one another.

The pandemic and the race for space. The most dramatic catalyst was the post-2020 shift in buyer preferences. Remote and hybrid working made outdoor space, extra rooms, and proximity to good schools far more important to a wider share of the market. Demand for houses — particularly semi-detached and detached stock in suburban and commuter markets — surged. Demand for city-centre flats, particularly smaller one- and two-bedroom units, softened considerably as the daily commute became optional.

Leasehold reform uncertainty. The legislative journey toward leasehold reform — including proposals to ease freehold enfranchisement and cap ground rents — introduced prolonged uncertainty for flat buyers and lenders. The prospect of ongoing reform, combined with rising service charges, made many buyers and their mortgage lenders more cautious about flats, particularly those with shorter leases or complex management structures.

Building safety and cladding. The aftermath of the Grenfell Tower fire in 2017 cast a long shadow over the leasehold flat market. EWS1 requirements, remediation costs, and lender restrictions effectively froze transactions for tens of thousands of flats in medium- and high-rise buildings. Even where buildings have since been cleared, the reputational damage to the high-rise flat sector has been slow to reverse — and service charge bills reflecting remediation costs have added another layer of buyer resistance.

Supply imbalance. New housing delivery in England has leaned heavily on apartment-led schemes, particularly in London, where planning authorities have long required high-density development. This has added persistent supply pressure on the flat market at precisely the moment demand has weakened — a structural mismatch that house prices have not faced in the same way.

The viability crisis at the heart of urban development

For developers and investors, the widening flat-to-house price gap is not merely an academic observation — it strikes directly at the commercial logic of apartment-led regeneration.

Urban regeneration schemes across London, Manchester, Leeds, and Birmingham have been underwritten on revenue assumptions anchored to flat sales values. When those values underperform — or when buyers demand larger units and outdoor space that a high-density block cannot efficiently deliver — development appraisals quickly move into the red.

REalyse viability data across several London boroughs shows that apartment-led schemes in zones 3–5 are operating on thin or negative margins at current GDV assumptions, once build cost inflation (running well above general CPI over recent years), affordable housing obligations, and infrastructure contributions are factored in. The numbers are more challenging still for smaller developers without the balance sheet to absorb delays or repricing risk.

The contrast with houses is stark. Where planning permission allows — in outer London, the wider South East, and regional cities with more generous land availability — schemes with a meaningful house component are outperforming those anchored entirely to flats. Housebuilders have reported stronger reservation rates and reduced incentive spend on houses relative to apartments over the past two to three years. Some larger developers have explicitly reweighted their pipeline away from apartment-heavy city-centre sites toward lower-density suburban and edge-of-town schemes.

This shift has real consequences for urban policy. If the economics of apartment-led development are structurally impaired, then the planning model that has underpinned regeneration in cities like London — dense, transit-oriented residential development near employment hubs — faces a genuine test of credibility.

Rental yield divergence is complicating the picture further

The gap is not uniform across buyer types. For investor buyers, the flat-versus-house calculation looks different — and in some ways, more favourable to flats.

Because flat capital values have underperformed, rental yields on flats have generally held up better than on houses, where rising purchase prices have compressed the income return. REalyse yield analysis across cities including Liverpool, Sheffield, and Nottingham shows that well-located one- and two-bedroom flats can still deliver gross yields in the 6–8% range — attractive territory for buy-to-let and single-family rental investors. Houses in the same postcodes, having appreciated faster, often yield 100–150 basis points less on a gross basis.

This dynamic is fuelling growing interest in the build-to-rent (BTR) and single-family rental (SFR) sectors. Institutional investors with a long-term income focus are less sensitive to the flat-versus-house capital value debate and more focused on rental demand, void rates, and operational efficiency. For these buyers, a city-centre apartment building with high occupancy and a strong local rental market — verified through REalyse active listings and achieved rent data — remains an investable proposition even where owner-occupier demand has softened.

The critical question is whether BTR demand can substitute for owner-occupier sales volume at a sufficient scale to keep apartment-led regeneration schemes viable. In some markets — notably Manchester city centre, Leeds South Bank, and parts of east London — the answer appears to be yes. In others, particularly outer-London and secondary regional cities where the institutional rental market is less liquid, the calculus is harder.

What this means for planning mix and urban policy

The record flat-house gap is forcing a rethink at every level of the planning and development ecosystem.

Some local planning authorities are beginning to acknowledge — sometimes reluctantly — that the density assumptions embedded in their local plans may need revisiting. If apartment-led development cannot be brought forward viably at the densities and prices assumed, then either the quantum of new homes delivered will fall short of targets, or the tenure mix (more rental, less for-sale) will shift in ways that planning policies have not fully anticipated.

There are also affordability implications. Flats have historically been a key route into homeownership for first-time buyers in urban areas. If flat prices are relatively suppressed but ownership-grade supply in city centres is thin — because developers are pivoting to BTR or scaling back delivery entirely — the pathway for first-time buyers in cities like London, Bristol, and Edinburgh becomes narrower, not wider.

The ONS and MHCLG housing delivery data will be closely watched over the next 12–18 months for signs of whether starts and completions in high-density residential categories are beginning to soften. REalyse planning pipeline data already shows an uptick in withdrawn and stalled applications in several inner-London boroughs, with viability cited as the primary reason.

Conclusion: a structural challenge, not a cyclical blip

The record gap between flat and house prices is the product of multiple overlapping forces — pandemic-driven preference shifts, leasehold reform overhang, building safety costs, and a supply pipeline that has leaned too heavily on apartment delivery at a time when owner-occupier appetite for flats has structurally weakened.

None of these forces is likely to reverse quickly. Hybrid working appears durable. Leasehold reform, however welcome in principle, will take years to fully land. Building safety remediation is a multi-decade challenge.

For the urban development sector, the practical response will likely involve a combination of: recalibrating new-build mix toward larger units and family-sized apartments; greater reliance on institutional rental demand to absorb supply; and direct engagement with local planning authorities to update viability assumptions embedded in planning policy.

For buyers weighing the flat-versus-house decision today, the data is clear — but it is not necessarily the final word. If remote working norms shift again, or if urban renaissance policies gain traction, the relative discount on city-centre flats could begin to look like an opportunity. Markets have a way of surprising those who assume the current trend is permanent.

Tracking that shift — in real time, at postcode level — is exactly what data platforms like REalyse are built to do.