OBR Warns Housing Supply Will Fall to 220,000 in 2026 — What Every Property Investor Must Understand

The Chancellor's Spring Statement on 3 March 2026 passed without major housing policy announcements — no stamp duty reform, no new buyer schemes, and no direct intervention in the rental market. But buried within the Office for Budget Responsibility's updated economic forecasts was a detail that every serious property investor should be paying attention to: UK housing supply is set to fall sharply before it recovers, and the consequences for the market over the next four years will be significant.

The OBR's Supply Forecast in Numbers

Net additions to the UK housing stock averaged 260,000 homes per year in the early 2020s. According to the OBR's March 2026 Economic and Fiscal Outlook, that figure is expected to drop to a low of 220,000 in the 2026–27 financial year — a reduction of roughly 40,000 homes annually compared to recent norms. The cause is straightforward: subdued housing starts from 2023 and 2024, driven by high construction costs and falling developer viability, are now feeding through into completed homes.

The forecast does not stay bleak. The OBR projects net additions will recover sharply to just over 305,000 by 2030–31, as the government's planning reforms — centred on changes to the National Planning Policy Framework (NPPF) — begin to take effect. The OBR estimates these reforms could cumulatively deliver 170,000 additional homes over the next five years, putting cumulative UK-wide net additions at 1.3 million between 2025–26 and 2029–30. That figure, notably, is around 30,000 higher than the November 2025 forecast — but it still falls well short of Labour's manifesto pledge to deliver 1.5 million homes before the end of this Parliament.

Why Planning Reform Is Not a Quick Fix

The industry response to the OBR's projections was measured and, in places, sceptical. Adrian Plant of SOWN summarised the consensus position clearly: planning reform is not a rapid solution. The process of converting policy changes into local plans, planning permissions, and completed properties takes years, not months. Changes to the NPPF that were introduced in late 2024 and early 2025 have yet to show up in meaningful increases in planning approvals, and developers still cite worsening viability conditions — rising labour costs, material inflation, and higher financing charges — as barriers to ramping up output.

The Home Builders Federation's Steve Turner was direct in pointing out that the projected shortfall quite clearly reflects the distance between the government's 1.5 million homes ambition and what is actually being built. Just over 100,000 homes were completed between January and September 2025, an 11% decrease on the equivalent period in 2024. That trajectory, if it continues into 2026, means the near-term supply picture is even tighter than the OBR's annual averages suggest.

What a Supply Crunch Means for Property Investors

For property investors, the implications of a sustained reduction in housing supply are broadly favourable — though the picture is more nuanced than a simple supply-shortage-equals-rising-prices equation. The OBR projects UK house price growth of approximately 2% in 2026, building to cumulative growth of around 16% by 2030–31. On current averages, that would take the UK average house price from roughly £270,000 today to around £314,000 by the end of the decade, with London average prices moving from £551,000 to approximately £641,000 over the same period.

The more immediate impact is felt in the rental market. With fewer new homes entering the stock and continued demand from renters who cannot yet afford to purchase, rental supply remains structurally constrained. Landlords who have held or are adding to portfolios now are effectively positioned ahead of a period where tenant competition for available stock is likely to remain elevated. Propertymark's Nathan Emerson noted that the Spring Statement underscores ongoing pressures in the UK housing market and called for more ambitious investment rather than stability alone — a signal that the industry does not expect supply pressures to ease rapidly.

Investors focused on regions outside London should note that affordability dynamics amplify the supply story in the North and Midlands. With less headline stock being built in lower-cost regions relative to demand growth, the yield and capital appreciation case for northern England and the Midlands remains compelling throughout the forecast period.

The Autumn Budget and What Investors Should Watch

The Spring Statement deliberately deferred major structural decisions — including any reform of stamp duty — to the Autumn Budget. The property industry was vocal in its disappointment. Felicity Barnett at Mortgage Advice Bureau noted that the government's housebuilding projections hinge on planning reform delivering in practice, not just on paper, while industry bodies across the board argued that without meaningful tax reform to incentivise transactions and investment, supply constraints will persist longer than the OBR's models assume.

For investors, the practical message from March 2026 is this: the window between now and when new supply materially improves the market — somewhere around 2028 to 2030 if the OBR's optimistic scenario plays out — represents a period of continued structural undersupply. That is the environment in which well-positioned property portfolios, particularly those with strong rental demand and value-add potential such as multi-unit freehold blocks and title-split strategies, are likely to generate their most consistent returns. The government has signalled where supply is headed. The question for investors is whether their portfolios are positioned to benefit from the journey there.