BLOGS

A sector in transition

For much of the 2020s, UK build-to-rent (BTR) looked like a one-way bet. Chronic undersupply, surging post-pandemic rents and a wall of institutional capital chasing residential income assets combined to drive record investment volumes and an accelerating development pipeline. By 2024, the British Property Federation estimated the UK BTR stock had surpassed 120,000 completed units, with a further 250,000 in planning or under construction.

But 2025 and 2026 have brought a more complicated operating environment. A sweeping legislative overhaul of the private rented sector in England, continuing rent control experiments in Scotland, persistent build-cost inflation and the gradual softening of headline rent growth have converged to put pressure on the underwriting assumptions that justified many schemes. The question facing developers, fund managers and lenders is no longer simply whether BTR works — it is where, at what cost, and under what regulatory conditions.

The regulatory ratchet tightens

The single most consequential shift for English BTR operators has been the Renters' Rights Act, which received Royal Assent in 2025. The Act abolishes assured shorthold tenancies and Section 21 "no-fault" evictions, replacing them with a single system of periodic tenancies. While the policy was primarily designed to protect individual tenants in the scattered private rented sector, its implications for professionally managed BTR portfolios are material.

For operators, the loss of fixed-term tenancies removes a key tool for managing void periods and portfolio turnover. Annual rent reviews — previously contractually locked in on new-build schemes — must now comply with a framework that limits increases to the lower of market rate or a prescribed index, assessed case by case through the First-tier Tribunal where challenged. Early anecdotal evidence from operators suggests the tribunal route is slower and less predictable than anticipated, introducing a new layer of management overhead.

Scotland has gone further still. The Housing (Scotland) Act has embedded rent control zones into planning policy, giving local authorities powers to cap rent increases in designated areas. Edinburgh and Glasgow — historically the two strongest BTR markets outside London — have both pursued designation, creating direct uncertainty for investors modelling ten-year income profiles. REalyse data tracking active rental listings in both cities shows a measurable shift toward shorter initial marketing periods and higher initial asking rents, as operators attempt to front-load income before controls bind.

Wales, operating under the Renting Homes (Wales) Act framework, has imposed a minimum six-month notice period for landlord possession and is actively consulting on further affordability measures. Northern Ireland, while retaining a distinct legal framework, is watching devolved developments closely, with political pressure building for similar protections.

Taken together, the direction of regulatory travel across all four nations is unambiguous: the balance of rights and risk in the rental relationship is shifting toward tenants. For institutional BTR, this is not necessarily fatal — professional operators are better placed than individual landlords to absorb compliance costs — but it does raise the bar for scheme viability.

Operating costs: the pressure beneath the headline

Regulation is only part of the story. The BTR business model depends on operating margins that have been eroding from multiple directions simultaneously.

Construction costs remain elevated relative to pre-2020 levels. While material price inflation has moderated from its 2022 peak, labour shortages in specialist trades — particularly those relevant to higher-specification BTR — continue to keep build costs sticky. REalyse development pipeline data indicates that per-unit construction costs on new BTR consents in outer London and major regional cities are running meaningfully higher than on comparable schemes underwritten three to four years ago, compressing the margin between development cost and stabilised asset value.

Energy Performance Certificate (EPC) requirements are adding a further layer of capital expenditure. The government's trajectory toward EPC Band C as a minimum for all new private lettings — and the expectation that Band B will become the benchmark for new-build BTR — means that schemes must now be designed and delivered to a higher specification from day one. For operators managing existing stock, retrofit costs are proving significant, with some portfolios requiring investment in the range of £10,000–£25,000 per unit to meet anticipated future standards.

Financing costs, while having eased from their 2023 highs as the Bank of England cut rates through 2024 and 2025, remain well above the near-zero environment that underpinned the most aggressive BTR underwriting of the early 2020s. Development finance at 6–7% and long-term debt in the 4.5–5.5% range — against stabilised net yields that in many markets sit in the 4.0–5.0% band — leaves very little room for error. Several schemes that achieved planning permission in 2022 and 2023 have been paused or repriced as developers and their funders recalibrate.

Rental growth: still positive, but the tailwind has faded

The extraordinary rental growth cycle of 2021–2023, when UK average rents rose by double digits in consecutive years, was always unsustainable. By 2025, annual rental growth had decelerated sharply across most major markets. REalyse rental listing data shows that asking rent growth in London has moderated to low single digits on a year-on-year basis, with some higher-priced boroughs — where affordability constraints are most acute — recording flat or marginally negative movements in average achieved rents.

Regional cities tell a more nuanced story. Manchester, Birmingham, Leeds and Bristol all saw sustained rental growth through 2024, supported by strong in-migration, limited supply and significant student and young professional demand. But even in these markets, the rate of growth has eased noticeably, with affordability ratios — rent as a share of median household income — now stretched to levels that historically presage demand softening or geographic shift.

The implication for BTR underwriting is significant. Many schemes were modelled on rental growth assumptions of 3–4% per annum over a ten-year hold. With current market conditions suggesting growth closer to 1.5–2.5% in stabilised markets, and regulatory caps potentially compressing upside further, the internal rate of return on a significant proportion of the outstanding pipeline looks less compelling than it did at the point of commitment.

This is reflected in transaction evidence. BTR investment volumes in 2025 were down compared to the record highs of 2022, with buyers becoming more selective on geography, asset quality and pricing. Gross yields on stabilised BTR assets have drifted out — in some regional markets to 4.5–5.5% — reflecting both vendor pricing adjustments and the higher return hurdles now demanded by equity investors.

Investor appetite: selective, not absent

It would be wrong to characterise the BTR sector as in retreat. The long-term demand case — demographic pressure, a chronically undersupplied housing stock, the continued decline of individual buy-to-let landlords exiting the market — remains structurally compelling. The question is at what price and in what locations institutional capital is prepared to deploy.

REalyse data shows that planning applications for purpose-built BTR schemes are still being submitted at a healthy rate, concentrated in locations with identifiable demand depth: city centre and urban fringe sites with strong transport connectivity, proximity to employment hubs and limited competing supply in the pipeline. Schemes with genuine amenity differentiation — coworking space, concierge services, pet-friendly policies, flexible lease terms — continue to attract premium rents that support viable economics.

What is changing is the bifurcation between viable and marginal locations. Outer-metropolitan markets, smaller regional cities and schemes in areas subject to rent control designation are facing materially harder funding conversations. Some schemes that would have been financeable in 2022 are now dependent on grant funding — whether through Homes England's Affordable Homes Programme or local authority planning contributions being restructured — to bridge the viability gap.

The single-family rental (SFR) sub-sector continues to attract investor attention as an alternative, with houses and townhouses in suburban locations offering lower build costs, strong family tenant demand and potentially less regulatory exposure than urban high-rise BTR. REalyse planning pipeline data suggests a growing share of new BTR consents are for lower-density, house-based schemes in the commuter belt and smaller towns.

Outlook: viable, but no longer effortless

The UK BTR sector will survive the current pressures — the structural drivers of demand are too strong for it to do otherwise. But the era of relatively frictionless growth, driven by surging rents and cheap debt, is over. What replaces it is a more selective, more sophisticated and more operationally demanding business.

Schemes that are well-located, built to high environmental standards, professionally managed and appropriately priced for local market conditions will continue to attract capital and deliver sustainable returns. Those that were underwritten on optimistic assumptions, in markets now subject to regulatory caps, or with cost bases that assumed a more benign financing environment, face a harder road.

For developers, investors and lenders navigating this environment, granular local market intelligence — on rental demand depth, planning pipeline, operating cost benchmarks and regulatory exposure — has never been more valuable. The ability to distinguish between markets where BTR genuinely works and those where the economics have shifted is increasingly the difference between value creation and capital destruction.