Private Landlord Exodus Hidden by Build-to-Rent Boom, Warns Propertymark

New analysis from Propertymark reveals that the headline stability of the UK private rented sector is an illusion. While overall rental stock figures appear broadly steady, this masks a dramatic acceleration in private landlords exiting the market, with their departures offset almost entirely by the rapid expansion of institutional build-to-rent (BTR) schemes. The net effect is a rental sector that looks resilient on paper but is undergoing a profound structural transformation beneath the surface — one that will have lasting consequences for tenants, landlords and investors alike.

This matters enormously for anyone with capital exposed to UK residential property. For the best part of two decades, the private rented sector was built on the back of individual landlords — often owning one to three properties, financed through buy-to-let mortgages and managing tenancies directly or through local agents. That model is now under sustained pressure from higher borrowing costs, tighter regulation under the Renters' Rights Bill, and the phased withdrawal of mortgage interest relief that began under Section 24. Propertymark's data suggests landlord instructions to sell have risen sharply in recent reporting periods, with agents in several regions reporting double-digit percentage increases in landlords listing properties for sale rather than re-letting them.

The build-to-rent sector has stepped neatly into the gap. Institutional investment in purpose-built rental accommodation has grown by an estimated 15–20% year-on-year in completions, according to industry tracking, with more than 110,000 BTR homes now operational across the UK and a further 60,000 under construction. Manchester and Birmingham remain the twin engines of this growth, each hosting large-scale schemes from operators such as Grainger, Legal & General and Get Living, while Leeds and Liverpool are increasingly attractive to institutional capital seeking yield outside London's saturated core. London itself continues to dominate in absolute volume, but yields there have compressed to the point that regional cities now offer materially better returns for pension funds and REITs deploying long-term capital.

The regional divergence this creates is stark. In cities where BTR is concentrated — Manchester, Birmingham, Leeds — renters are seeing a genuine expansion of professionally managed, amenity-rich stock, often at a premium price point that sits above the traditional private rental market. But in areas where institutional capital has little appetite to build — smaller towns, rural markets, and commuter belts such as Surrey — the departure of private landlords is not being replaced at all. Tenants in these markets face shrinking choice and intensifying competition for a static or declining pool of homes, which is already pushing rental growth in outer commuter zones above the rates seen in city centres themselves.

For buy-to-let landlords still in the market, this is a moment of reckoning rather than opportunity. Those with unencumbered or lightly geared portfolios in high-demand regional cities are positioned to benefit from reduced competition among private landlords and sustained tenant demand. But highly leveraged landlords, particularly those holding single properties in less liquid markets, face a stark choice between refinancing at considerably higher rates or selling into a market where first-time buyers — themselves squeezed by mortgage affordability — may struggle to absorb the additional supply. Commercial investors and developers, meanwhile, have every incentive to accelerate BTR pipelines: institutional capital is effectively filling a vacuum left by retreating private landlords, and the returns on offer in Manchester, Leeds and Birmingham increasingly justify the development risk.

Over the next six to twelve months, expect this bifurcation to deepen. Further landlord exits are likely as remortgaging at higher rates collides with tightening regulation, while BTR completions continue their upward trajectory, particularly in the North West and West Midlands where land values and yields remain favourable relative to London and the South East. Policymakers should not mistake headline stock stability for market health — the composition of Britain's rental sector is shifting from dispersed, individually owned stock towards concentrated, professionally managed portfolios, with significant implications for tenant choice, rent-setting power, and the geography of housing availability. Investors who understand this shift early, and position capital accordingly, will be the ones who capture the value as the market completes its transition.