One third of new London homes failed to find private buyers last year.

One third of new homes completed in London last year failed to sell to private buyers, a striking sign of how badly the capital’s housing market has become distorted by high prices, weak demand and a development model increasingly detached from the people it is supposed to serve.

The figures, which throw fresh light on a crisis now moving from the planning system into the realm of visible commercial failure, suggest that large parts of the market are no longer functioning in the way housebuilders, lenders and ministers once assumed. Homes continue to be built, but at prices many ordinary buyers cannot reach, in locations where the private market is no longer strong enough to absorb the supply. The result is a growing stock of unsold flats and houses, a slowdown in schemes and a further squeeze on an already broken chain of delivery.

The scale of the problem is especially significant because London has long been the most resilient and expensive part of the UK housing market. Even here, where demand has historically outstripped supply and where developers could rely on a deep pool of domestic and international buyers, the system is showing signs of strain. The failure of so many newly built homes to secure private purchasers is not simply a cyclical wobble. It is a warning that the economics of housebuilding in the capital are becoming increasingly untenable.

The timing matters. The housing crisis is now poised to be inherited by Andy Burnham, who has emerged as one of Labour’s most prominent regional figures and whose politics have increasingly placed him at the centre of debates about growth, devolution and the future distribution of power within England. While the immediate problem concerns London and its wider housing market, the broader lesson is national. If the capital, with its wealth, international status and chronic shortage of homes, cannot sustain the current model, then the outlook for other parts of the country is even more troubling.

The data point to a market that is being pulled in opposite directions. On the one hand, successive governments have pressed for more housebuilding, arguing that only a sustained increase in supply will begin to address the structural shortage. On the other, the type of homes being built, especially in the capital, often remain out of reach for the broad middle of the market. Developers, facing high land costs, expensive borrowing and policy uncertainty, have tended towards schemes that maximise value per square foot. The outcome has been a concentration on smaller, higher-priced flats, often in large blocks, rather than the family homes and genuinely affordable properties that many Londoners need.

That business model now appears to be buckling. If a third of new homes are failing to find private buyers, then the problem cannot be reduced to a temporary slowdown in transactions. It suggests a deeper mismatch between the product being delivered and the capacity of the market to absorb it. It also raises questions about the financial assumptions underpinning future schemes. Housebuilders depend on a healthy rate of pre-sales, confidence among lenders and enough demand to justify the upfront costs of construction. Once those assumptions begin to fail, the entire pipeline is affected.

For Londoners, the practical consequences are familiar but no less severe. Prospective buyers face a city in which ownership remains beyond reach for many on ordinary salaries, while renters confront ever higher costs and increasingly poor value for money. The private rental sector has become a pressure valve for the housing shortage, yet it is itself under strain, with landlords exiting the market, borrowing costs remaining elevated and regulatory uncertainty discouraging fresh investment. In this context, new homes that do come to market can sit unsold not because there is no need for housing, but because the price point is wrong for the people who most need it.

The broader political implication is that London’s housing market can no longer be treated as a standalone engine of growth that will naturally sort itself out if enough units are approved. The old assumption that demand at the top of the market would gradually filter down has been repeatedly challenged, yet policy continues to lean on it. The consequence has been a system in which development is measured by the number of starts and completions, while too little attention is paid to whether the resulting homes are actually purchased, occupied or affordable.

This is where the crisis acquires a more serious dimension. Empty or unsold homes are not just a commercial embarrassment for developers. They represent capital frozen in place, delayed neighbourhoods, reduced labour mobility and a failure to convert planning permissions into lived-in communities. In a city struggling with overcrowding, rising rents and stagnant living standards, that is a particularly bleak outcome. Building more homes, if those homes are priced beyond the reach of most residents, does not in itself resolve the underlying shortage of decent and accessible housing.

The issue also exposes a tension at the heart of urban regeneration. Large redevelopment schemes are often justified as catalysts for renewal, bringing investment, new infrastructure and a revitalised skyline. Yet the language of regeneration can obscure a harder reality, especially in London, where such schemes frequently generate homes that are expensive to buy and costly to rent. That can produce districts that are visually transformed but socially depleted, with many properties taken as investments or left unoccupied, while workers and families are pushed further out.

Housing policy has for years been built around the idea that supply alone, if sufficiently increased, will ease pressure across the market. There is truth in that, but London’s latest figures show that supply without affordability can create a different kind of stagnation. If homes are built at prices the market cannot bear, the result is not an immediate increase in occupancy but a pile-up of unsold stock and a deterioration in confidence. That is especially damaging in a climate where interest rates, construction costs and broader economic uncertainty have already made development more difficult.

For politicians, the challenge is twofold. First, they must recognise that the current model is failing on its own terms. Second, they must confront the uncomfortable fact that a functioning housing market requires more than permission to build. It requires finance structures that support genuinely affordable provision, planning rules that encourage diversity of tenure and size, and a tax and regulatory environment that does not reward holding land or homes unused. Without those changes, the capital will continue to generate headlines about new supply while producing too little housing that people can actually use.

Andy Burnham’s association with the crisis is important not because it makes him responsible for London’s housing failures, but because it reflects the way the problem is now being reframed politically. Once seen as an issue of local planning friction or private sector underperformance, housing has become a test of public credibility. Whoever is in charge of the next phase of policy will inherit not just a shortage of homes, but a deeper loss of faith in the mechanisms designed to deliver them. That loss of faith is dangerous, because housing is one of the few policy areas where public expectation, private capital and social need all collide in the same physical space.

The latest figures therefore represent more than a snapshot of a difficult year for sales. They point to a capital that is building homes, but not enough of the right kind, at prices too many buyers cannot meet. They suggest that the housebuilding crisis has moved beyond shortage into dysfunction, and that the market’s failures are now visible even at the top end of the system. If London cannot sell a substantial share of its new homes to private buyers, the question is no longer simply how many more units should be planned. It is what sort of housing economy the country is actually trying to build, and for whom.