BLOGS

The paradox at the heart of BTR

Build-to-rent should be thriving. The UK rental market is experiencing one of the strongest demand periods in decades. REalyse data shows average achieved rents for flats grew 8.5% year-on-year, with properties letting in an average of just 38 days. Gross yields for purpose-built flats remain attractive at around 5.7%, while average asking rents have climbed past £1,600 per month nationally.

Yet something is clearly wrong with the pipeline. Industry figures indicate BTR construction starts fell by 80% in London during 2025, while regional starts dropped 37%. The number of units under construction across the UK's core cities fell by 11% between Q1 2025 and Q1 2026. Despite approximately 287,000 homes either completed, under construction, or in planning, completions in 2025 were roughly 20% below the 2024 peak.

The BTR market is not short of demand. It is short of certainty.

The viability crunch

Three forces are squeezing BTR viability simultaneously.

Construction costs have risen 30–40% over the past few years, driven by materials inflation, labour shortages, and Building Safety Act compliance requirements. BTR schemes, with their emphasis on communal amenities, operational infrastructure, and higher-specification finishes, are particularly exposed to cost escalation.

Financing conditions have tightened considerably. Construction loan rates of around 9.5% are now typical, and lenders are demanding larger interest reserves and stronger completion guarantees. Many schemes that were viable at 2021 rates simply do not stack up today. REalyse data shows that while gross yields for flats average 5.7%, this margin compresses significantly once financing costs, operational expenses, and long void periods are factored in.

Regulatory and fiscal uncertainty adds a further layer of risk. The Renters' Rights Act, evolving building safety requirements, and unpredictable changes to development taxation have made it harder for investors to model long-term returns with confidence. Consented projects are sitting on ice because the numbers no longer work.

As one industry commentator put it: BTR is a long-term hold, but you have short-term capital going in at the start against long-term income. That mismatch has become increasingly difficult to bridge.

Regional divergence: London stalls, the regions diversify

The slowdown is not uniform. London has been hit hardest, with construction starts collapsing and multi-family submissions dropping sharply from their peak. Land values in the capital remain elevated, leaving insufficient margin to absorb higher build and finance costs.

The regions tell a different story. Around 60% of BTR units under construction now lie outside London and the South East, signalling the sector's geographic maturation. Birmingham has over 16,000 BTR units in planning or under construction, making it the fastest-growing BTR market outside the capital. Manchester, Leeds, and Bristol continue to attract strong developer interest.

REalyse planning data shows BTR schemes with detailed planning permission rising 17.6% year-on-year, suggesting developers are preparing projects that could move into construction once conditions improve. The pipeline has not dried up—it has simply paused.

Investment remains committed, but patience is required

Despite delivery headwinds, institutional capital continues flowing into BTR. An estimated £5.3 billion was invested in UK BTR developments during 2025, up 6.1% on the prior year. Forecasts suggest investment will rise a further 7.7% in 2026, potentially exceeding £5.7 billion annually.

Notably, single-family housing (suburban BTR) attracted a record £2.6 billion across 44 deals in 2025. Investors are pivoting towards lower-density, lower-risk suburban rental stock where construction complexity is reduced and demand remains robust.

The shift reflects a broader recalibration. Operational assets are now driving investment volumes rather than forward-funded development. Investors are preferring stabilised income over development risk until cost and financing headwinds ease.

What would unlock delivery?

Industry voices are calling for three interventions to restore BTR momentum:

Planning certainty. Clearer pathways for large-scale rental schemes, reduced timescales, and consistent local authority approaches to affordable housing contributions within BTR would help developers de-risk pipelines.

Fiscal stability. Predictable treatment of development taxation, VAT, and landlord levies would allow investors to model returns with greater confidence. Sudden policy shifts can undermine financial models and deter long-term capital.

Financing innovation. Construction-to-permanent loan structures, forward-funding partnerships, and patient capital from pension funds and insurers could help bridge the gap between short-term development costs and long-term rental income.

Outlook: a crossroads for BTR

The UK's build-to-rent sector is maturing, but that maturation is being tested. Around 147,000 BTR homes have been completed nationally, with a similar number in the pipeline. The sector could ultimately require far greater investment to meaningfully address rental supply shortages.

The fundamentals remain as strong as ever: rents are rising, vacancy rates are low, and demand from a generation of long-term renters shows no sign of fading. REalyse data continues to show tight rental markets across major cities, with flats letting quickly and achieved rents outpacing asking prices.

But fundamentals alone will not build homes. 2026 will reveal whether BTR is treated as a core part of the UK's housing mission or as a sector stymied by complexity. For now, the pipeline is pausing—not stopping—while developers, investors, and policymakers search for a path through the viability squeeze.