BLOGS

The UK's residential development sector entered 2026 facing a sobering convergence of pressures. Construction costs that have not meaningfully normalised since their post-pandemic peak, a development finance market that has barely thawed despite the Bank of England's gradual base-rate descent, and a regulatory pipeline that keeps adding cost before developers can draw down a single pound of senior debt. The result is a sector in which viability is being stress-tested at almost every scheme, and where the decision to rephase, downscale or mothball a site is no longer an edge case — it is a routine part of appraisal.

Against that backdrop, a clear regional divergence is emerging. Southern markets, and London above all, are bearing the sharpest end of the viability squeeze, while a handful of northern city-regions — backed by regeneration capital and supported by fundamentally different land and yield dynamics — are showing that new housing can still be made to work.

The cost stack has not recovered — and is about to get worse

The Home Builders Federation's latest analysis tells a stark story: the average cost of delivering a new home in England has risen by approximately £76,000 since 2020. Materials are up more than 40%, adding around £28,500 per unit. Labour costs have climbed 23%, contributing a further £8,500. Over the same period, the average new-build sale price moved from around £316,000 to approximately £339,000 — a gain of just £23,000. The gap between rising costs and static revenues has gutted developer margins, compressing what might once have been a 20–22% profit on cost to somewhere between 10–15% for an equivalent scheme today.

Labour is now the sharper edge of the inflationary problem. Construction labour costs grew 6.4% in 2025 alone, against a pre-Covid norm of around 3.2%, driven in part by the increase to employer National Insurance Contributions and the rise in the National Living Wage. The shortage of skilled workers — with an estimated 244,000 having left the construction workforce since 2019 — is structural, not cyclical. The Joint Industry Board's recently agreed deal locks in further wage increases of approximately 3.95% in 2026, 4.6% in 2027 and 4.85% in 2028. There is no near-term relief on the horizon.

The broader picture is one of sustained pressure. The BCIS General Building Cost Index recorded annual inflation of 3.8% in March 2026. By April, the S&P Global UK Construction Purchasing Managers' Index's measure of input cost inflation leapt to 81.4 — its highest level since June 2022 — while the headline construction PMI fell to 39.7, its weakest reading in five months and well below economists' expectations. Turner & Townsend's tender price inflation forecast for real estate has risen from 3% in 2025 to 3.5% in 2026. BCIS projects that general building costs will rise a further 14% between mid-2025 and mid-2030.

REalyse data reflects the downstream effect. Planning approvals for residential schemes fell from approximately 10,500 in 2024 to around 8,700 in 2025 — a 17% decline — consistent with developers declining to progress sites that cannot be made viable at current costs. The national picture on starts is only marginally better: the UK recorded an estimated 150,600 housing starts in 2025, up 12.4% on 2024, but still 21.4% below pre-pandemic levels. Private housing output is forecast to fall a further 7% in 2026.

A regulatory wave that developers cannot fully price in

The cost-inflation problem is being compounded by a simultaneous wave of new regulatory requirements, each individually defensible in policy terms, but cumulatively devastating to scheme viability.

The Future Homes Standard — now embedded in the 2026 Building Regulations — requires new homes to use low-carbon heating and meet significantly higher energy-efficiency thresholds. The HBF estimates this adds more than £10,000 per unit in additional build costs. Biodiversity net gain obligations, now mandatory for most schemes, add a further estimated £5,700 per home. Landfill Tax doubled in April 2026 and is set to rise every year until 2030.

Most consequentially for the immediate pipeline, the Building Safety Levy comes into force on 1 October 2026. Applicable to all residential developments of ten or more units, it is designed to raise £3.4 billion to fund cladding remediation following the Grenfell disaster — a legitimate goal that the industry broadly accepts. What developers are pushing back on is the timing and the stacking effect. The HBF calculates the Levy adds £2,320 per home in additional cost, on top of a sector that has already contributed roughly £7 billion to building-safety remediation through other routes. More than 100 housebuilders wrote to the Chancellor earlier this year calling for the Levy to be suspended, warning it would suppress starts in precisely the marginal markets where delivery is most fragile.

Development finance compounds all of this. Despite the Bank of England reducing base rate to 4.25% through a series of 25 basis-point cuts since early 2025, the cost of development debt has not fallen proportionally. Senior loans from challenger banks — Shawbrook, Aldermore, Paragon, OakNorth — are typically priced at 7.5–10% all-in for loans up to 65–70% LTGDV. Stretched senior finance runs at 9.5–12.5%. The Development Index 2026, drawn from surveys of institutional developers and asset managers, found that almost all respondents reported "low" or "very low" confidence entering 2026, while noting that financing was available but "selective" — with many debt funds struggling to deploy capital due to a shortage of viable projects.

London and the South: a delivery crisis in plain sight

Nowhere is the viability squeeze more acute than in London. New analysis from London Construction Magazine shows that only 6,325 private sector homes broke ground across the capital in the first quarter of 2026 — roughly 7% of the capital's annual identified housing need of 88,000 new homes per year. The causes are layered: high land prices that embed optimistic GDV assumptions into site costs, a buyer market where hesitation around new-build premiums has reduced sales velocity, and build costs that have outpaced values. Where a developer cannot sell quickly enough to cover finance costs, the rational response is to delay starts, slow procurement and wait for conditions to change.

REalyse planning data shows the effect rippling through the pipeline across the wider South East and southern England. Schemes that might have cleared viability at 2021 build costs — with 2021 finance rates — are being re-appraised and frequently failing to reach the required return thresholds. The result is not outright abandonment in most cases, but rephasing: developers stretching timelines, cutting plot numbers, renegotiating affordable housing contributions with local authorities, or deferring the start of later phases on consented multi-phase schemes.

Planning permissions nationally have fallen sharply, from 336,000 homes granted in 2019 to approximately 221,000 in 2025 — a 34% reduction. The government's planning reform agenda is expected to rebuild that pipeline over the medium term, but permissions granted today translate into starts in two to four years; the delivery gap is accumulating now.

The northern exception: why some schemes are still proceeding

The contrast with a cluster of northern cities is striking — and instructive. Lower land acquisition costs, stronger rental yield dynamics and a concentrated wave of government-backed regeneration investment are keeping a meaningful development pipeline alive in Manchester, Leeds, Sheffield and Liverpool, even as their southern counterparts go quiet.

Manchester's position is the clearest data point. Deloitte's 2026 Crane Survey estimates approximately 5,500 residential units will complete in the city this year — the second-highest annual total in the survey's history — with a further 15,332 homes already holding planning permission. Manchester Victoria North, one of the UK's largest city-centre regeneration schemes, is planning to deliver at least 15,000 homes over the coming decade. In Leeds, the South Bank programme is targeting up to 13,000 new homes across Hunslet and Holbeck, backed by both Homes England and the West Yorkshire Combined Authority. Sheffield's city centre regeneration pipeline — including the Moorfoot Neighbourhood and Station Campus — is receiving £85m of dedicated government funding through the Northern Growth Corridor deal announced in March 2026.

The economics of northern cities make a real difference to the viability equation. REalyse data shows gross rental yields in Manchester and Leeds running at 5.4–5.6%, compared with sub-3.5% in much of the London market. Where build-to-rent operators can underwrite higher stabilised yields, the return profile of a scheme can survive higher finance costs. Lower starting land values also mean there is more headroom to absorb cost escalation before a scheme fails its appraisal. Rental growth projections for Manchester and Leeds of 28–31% between 2025 and 2030 — among the strongest in the UK — give lenders and equity investors greater confidence in forward-looking GDV assumptions.

The government has reinforced these conditions with institutional capital. The National Housing Bank, launched on 31 March 2026 and headquartered in Leeds, carries up to £16 billion in capital investment mandate, with specific products targeting viability gap funding and land assembly. Its early analysis suggests it will support the delivery of approximately 280,000 new homes and unlock land capable of hosting a further 400,000 over the next five years — with a clear weighting towards the northern city-regions where public intervention can best catalyse private delivery.

The SME challenge

Beneath the headline regional divide, one segment of the market is absorbing disproportionate strain: small and medium-sized housebuilders. Unlike volume housebuilders with large consented land banks and access to corporate bond markets, SMEs are dependent on development finance, sensitive to planning delays, and less able to cross-subsidise unviable phases from the proceeds of profitable ones. The construction sector recorded 3,973 insolvencies in the year to July 2025 — representing 17% of all UK corporate insolvencies. Most of that attrition was at the SME end. The HBF has called explicitly for a moratorium on new policy costs and levies, arguing that without it, SME delivery — which is critical to diversifying supply beyond the volume builders — will continue to contract.

Outlook: viability before ambition

The government's ambition of 1.5 million homes over this parliament remains formally intact. Net additions in England ran at an estimated 191,300 between April 2025 and March 2026 — a figure that implies an annual rate significantly below the 300,000-plus needed to remain on track. Planning reforms, the National Housing Bank's viability gap products, and new funding for the Northern Growth Corridor are all constructive policy levers. But they are operating against a backdrop where the fundamental economics of residential development — costs, values, yields and finance — remain structurally misaligned across wide swathes of the country.

The regional picture that REalyse data reveals is not simply a north–south divide in sentiment or confidence. It is a divide in the underlying arithmetic. In Manchester or Leeds, a well-structured scheme with a competent sponsor can still clear its hurdle rate. In outer London or the commuter belt, the same scheme, built to the same standard, with the same finance costs, frequently cannot. Until that arithmetic closes — through a sustained fall in finance costs, a moderation of cost inflation, a reduction in regulatory burden, or a structural rise in achieved values — developers will continue to do what rational actors always do: focus capital where returns are possible and defer everything else.

For investors and lenders using REalyse to track planning pipelines, comparable values and rental yield dynamics across postcode districts, the practical implication is to monitor which consented schemes are actually progressing to start — and which are quietly slipping into deferral. The gap between what is consented and what is being built is where the real story of the 2026 development market is playing out.