London faces a looming housing supply crisis that experts warn could intensify significantly from next year through to 2029, driven by a sharp decline in new homebuilding. Developer Ballymore Group, which manages several major projects across London including Canary Wharf, Nine Elms, and Brentford, reports constructing around 1,000 homes annually—less than half the volume seen a decade ago. Ballymore’s chief executive officer, John Mulryan, cites a combination of rising construction costs, stricter planning regulations, and recent tax changes as key factors undermining investment and large-scale development viability in the capital.

Data released this year shows a widening gap between housing starts and completions—the largest in over 30 years—highlighting the dwindling pipeline of new homes. Although government efforts have introduced emergency measures aimed at boosting supply, analysts caution these have so far yielded limited results. Much of the recent gradual increase in construction activity is largely attributable to delayed projects cleared to proceed only after meeting enhanced building safety regulations imposed in the wake of the 2017 Grenfell Tower tragedy.

The ongoing disparity between housing starts and completions signals a forthcoming supply crunch that could put upward pressure on property prices and rents. While this trend may benefit current homeowners and investors, it poses broader risks to London’s economic competitiveness. High housing costs restrict labor mobility and inflate recruitment expenses for employers, ultimately constraining the city’s growth potential. Moreover, the steep decline in new construction complicates Prime Minister Andy Burnham’s Labour government’s goal of delivering 1.5 million new homes nationwide within the parliamentary term—a target now widely regarded as unlikely to be met.

Despite the shrinking number of new developments, the market has yet to fully feel the impact, with housing completions and net additional dwellings (which account for conversions and demolitions) remaining near long-term averages. However, the buildup of unsold finished and partially completed homes has reached unprecedented levels, indicating severe market distress. As of June, there were approximately 4,600 completed but unsold homes and almost 2,700 halted mid-construction, reflecting worsening sales conditions described by industry sources as some of the most challenging in recent memory.

Several factors compound these difficulties: soaring inflation during the COVID-19 pandemic, intensified regulatory demands, and persistent high borrowing costs exacerbated by ongoing interest rate hikes from the Bank of England. Additionally, the traditional development model—heavily reliant on pre-sales to overseas investors and cross-subsidy of affordable housing—is faltering amid increased taxation and diminished foreign demand.

Affordability remains a pressing issue, with London’s median house price to earnings ratio exceeding 10 last year, a substantial increase from less than eight in the mid-2000s when mortgage rates were comparable. While past government schemes like Help to Buy temporarily supported first-time buyers, current relief measures such as easing affordable housing obligations and infrastructure levies offer only short-term respite.

Property experts note that housing prices tend to be slow-moving and may remain elevated without significant interest rate reductions, likely prolonging the market’s stagnation. This dynamic suggests that market forces alone may be insufficient to address London’s housing challenges. Proposals gaining traction include increased state intervention, such as the establishment of a public sector master developer to assemble land and allocate sites to private builders, potentially lowering risks and costs associated with development.

Prime Minister Burnham has pledged a substantial expansion of social housing, though questions remain over funding within current fiscal constraints. Buy-to-rent initiatives may also contribute to supply growth, but developers in this sector face many of the same headwinds as those focused on outright sales.

With the existing framework proving inadequate, many observers agree that significant policy shifts are necessary to meet London’s housing needs and sustain the city’s long-term prosperity.