BLOGS

The UK build-to-rent sector arrived at 2024 with considerable momentum. Years of rising rents, near-zero vacancy rates, and institutional appetite had combined to produce a planning pipeline that, on paper, pointed firmly upward. Then the cost of capital reasserted itself. Development finance rates climbed sharply in the wake of successive Bank of England base rate rises, and the gap between what a scheme needed to earn and what lenders were prepared to underwrite on reasonable terms widened faster than rents could close it.

By mid-2025, that gap had not fully closed. The result is a sector that is still building — but building differently.

The financing squeeze: what changed and why it matters

BTR is a long-income, volume-driven model. Unlike build-for-sale, there is no chunky forward sale to de-risk the development phase; returns accrue gradually over a hold period of ten years or more. That makes the sector acutely sensitive to the cost and availability of development finance, the exit yield at which investors are prepared to transact, and the level of stabilised rental income a scheme can realistically achieve.

When the Bank of England base rate rose from near zero to 5.25% between late 2021 and mid-2023, all three inputs shifted against developers simultaneously. Development finance margins widened. Institutional buyers — pension funds, life companies, and global real estate managers — repriced their target yields upward, compressing capital values. And construction cost inflation, running at 8–10% per annum during 2022–23, added pressure to already stretched appraisals.

REalyse data tracking active BTR listings and planning applications across England, Scotland, and Wales confirms the downstream effect: a meaningful slowdown in new scheme starts compared to the high-water mark of 2021–22, with a smaller but growing number of applications being either revised downward in unit count or resubmitted with altered tenure mixes to include a higher proportion of affordable and intermediate-rent product.

Viability appraisals under pressure

The fundamental arithmetic is stark. A large BTR scheme in a regional city might target a stabilised gross yield of 5.5–6.5% on total development cost. When risk-free rates were close to zero, that spread over gilts looked attractive. With ten-year gilts trading above 4% through much of 2024 and 2025, the risk-adjusted case for institutional BTR capital has become harder to make — particularly for schemes with land at values that reflect a pre-rate-rise world.

Section 106 obligations and the Community Infrastructure Levy have also come into sharper focus. Viability assessments submitted with planning applications — visible in REalyse's planning data — increasingly show developers arguing for reduced affordable housing contributions on the grounds of scheme viability, a trend that is generating friction with local planning authorities in London and other high-cost cities.

London slows, regional cities accelerate

The most significant structural shift in the BTR pipeline has been geographic. London, historically the dominant market for institutional rental product, has seen a relative retreat. Land values remain elevated, planning requirements are demanding, and the yield gap between development cost and exit has been hardest to bridge in the capital.

The regional picture is markedly different. Manchester, Birmingham, Leeds, Edinburgh, Glasgow, Bristol, and Sheffield are all seeing sustained BTR activity in the REalyse planning pipeline, with approved and under-construction schemes concentrated in city-centre and urban-fringe sites where land basis is more manageable and rental growth has, in many cases, outpaced London on a percentage basis.

REalyse rent listing data for major regional cities shows average achieved rents for new-build BTR flats running at levels that produce gross yields of 5.5–7% in several North West, Yorkshire, and Scottish markets — ranges that, even with higher financing costs, remain investable for well-capitalised operators with lower leverage.

Affordability as a product design lever

One response to the yield squeeze has been product redesign. Developers and their institutional backers are reconfiguring schemes to target a broader segment of the renter market, reducing average unit sizes slightly, introducing more studio and one-bedroom product, and — critically — incorporating affordable rent and intermediate rent tranches that attract grant funding from Homes England and the Scottish Government's affordable housing programmes.

Grant subsidy effectively reduces the blended development cost per unit, improving overall scheme return. REalyse planning data shows a growing number of BTR applications in England that include 20–35% affordable or intermediate rent units, often with a mix of London Affordable Rent, Affordable Rent at 80% of market, and shared ownership. This hybrid model is increasingly how the sector is threading the needle between investor return requirements and planning policy expectations.

It is also, in some respects, a response to the cost-of-living pressure bearing on would-be renters. Average asking rents in many major UK cities rose by 8–12% between 2022 and 2024, according to REalyse rent listing data, but wage growth has not kept pace across all tenant segments. Operators who price appropriately — and can demonstrate stable occupancy through a market cycle — are the ones attracting capital in the current environment.

Is the pipeline actually shrinking?

The headline data on BTR investment volumes suggests a sector under pressure. CBRE and Savills research consistently cited a fall in BTR transaction volumes through 2023 and into 2024, as buyers and sellers struggled to agree pricing reflecting the new rate environment. But pipeline data — the number of units in planning, with consent, or under construction — tells a more nuanced story.

REalyse data across the UK planning system shows that the total number of BTR units with planning consent or under construction remains substantial, driven by approvals granted during the 2020–22 period that are now working their way through the construction cycle. The acute contraction is at the front end: new pre-application and application-stage activity slowed considerably through 2023–24, which means the current completions pipeline looks healthier than the five-year horizon.

The regional breakdown reinforces this: London's share of the consented pipeline has declined, while the North West, Yorkshire and the Humber, and the East Midlands have collectively grown their share. Scotland — benefiting from a combination of strong rental demand in Glasgow and Edinburgh, a proactive planning environment, and Holyrood's housing delivery ambitions — has also increased its weighting in the national BTR pipeline.

Operator consolidation and the flight to quality

A secondary effect of the financing squeeze has been consolidation at the operator level. Smaller, less-capitalised developers who relied on construction-to-investment debt have found the market materially harder to navigate. Larger, vertically integrated operators — those with established relationships with life companies and pension funds, proven track records on stabilised yield delivery, and internal asset management capability — have been better positioned to progress schemes.

This consolidation is visible in the REalyse data: the distribution of BTR planning applications by developer name has narrowed, with a handful of specialist operators and major housebuilder BTR divisions accounting for a growing share of units in the pipeline. For local authorities and housing associations seeking delivery partners, this concentration creates both opportunities (reliable large-scale delivery) and risks (reduced competitive tension and fewer smaller, community-scale BTR schemes).

Outlook: rate relief, policy tailwinds, and structural demand

The trajectory of the Bank of England base rate through 2025 and into 2026 is critical. REalyse's planning data suggests that a significant volume of BTR schemes — particularly those with lapsed or soon-to-expire consents — is poised for re-activation once financing conditions ease sufficiently to restore appraisal viability. Rate cuts in the 100–150 basis point range from peak would, in most regional markets, restore workable spread between development yield and debt cost.

On the policy side, the Labour government's housing delivery ambitions — including a statutory 1.5 million new homes target and reforms to the National Planning Policy Framework — create a more permissive planning environment that should benefit BTR, which typically delivers at scale on urban brownfield sites. Greater London Authority targets for affordable housing within BTR schemes remain demanding, but there are signs of pragmatic negotiation on planning obligations as the affordability crisis in private renting deepens.

Structurally, the demand case for professionally managed rental product has, if anything, strengthened. REalyse rent listing data consistently shows that new-build BTR properties — typically offering longer tenancies, professional management, and on-site amenities — command a rental premium of 8–15% over equivalent private-landlord stock in the same postcode district, a gap that reflects the depth of tenant appetite for a better rental experience.

The BTR pipeline is not broken. It is recalibrating — geographically, financially, and in terms of product design. Investors and developers who can navigate the current viability gap, embed affordability within their schemes, and target markets where rental growth and yield fundamentals remain supportive are finding that the long-income thesis for UK BTR is intact. It just requires sharper underwriting than the era of cheap money demanded.