Is the UK Private Rented Sector Expanding or Contracting? What’s Really Going On

If you’re a landlord, letting agent, or tenant, you’ve probably noticed some apparently conflicting headlines:

• “Rental supply up 15%”

• “Landlords are leaving the market in droves”

• “Build-to-rent is booming”

So which is it? Is the private rented sector (PRS) actually expanding, or is it shrinking – and just behaving oddly in the short term?

In this article, we unpack what’s happening beneath the headlines and look at the key forces that will shape the sector over the next three to five years.

1. The confusing picture: more rental listings, but not more rented homes

Recent market commentary has highlighted a sharp increase in the number of homes listed to rent – roughly a 15% rise year-on-year in properties being advertised.

On the ground, that feels like the market is loosening:

• Tenants suddenly have a bit more choice.

• Properties aren’t being snapped up quite as quickly.

• Agents are reporting slightly longer void periods than in the ultra-pressured 2022–2023 period.

It’s very tempting to conclude that the PRS is therefore “expanding”.

But there’s a crucial distinction:

More homes advertised for rent right now does not necessarily mean there are more homes in the PRS overall.

Most of the underlying stock data suggests the size of the PRS is broadly flat, and in some sub-sectors gently shrinking. What we’re seeing in 2025 is mainly a cyclical shift in supply and demand, not a structural boom in landlord numbers.

2. How big is the PRS really – and how has it changed?

To understand whether the sector is expanding or contracting, it helps to zoom out.

The big expansion: 2000–2015

Between the early 2000s and the mid-2010s, the UK experienced a major expansion of the private rented sector:

• Tight mortgage criteria and higher house prices pushed more people into renting.

• Buy-to-let mortgages became mainstream and relatively attractive.

• Many small “accidental landlords” joined the sector, often after inheriting property or being unable to sell.

Over that period, the PRS more or less doubled in size, moving from a small minority of households to almost one in five.

The recent plateau

Over the last decade, that growth has stalled:

• The proportion of households renting privately in England has been sitting around 19–20% for years.

• UK-wide, it’s a similar story – the PRS is large, but no longer obviously expanding as a share of total households.

So in structural terms:

The PRS is big and stable in size, not still racing upwards. The age of rapid expansion is behind us.

Signs of gentle contraction

More recently, there are growing signs that the sector is starting to shrink at the margins:

• Landlord surveys consistently report large numbers of owners saying they plan to sell up or reduce their portfolios.

• Analysis of transaction data suggests that, in some years, more rental properties are being sold into owner-occupation than are being added as new rentals.

The direction is subtle – this is not a collapse – but the trend for many small landlords is out, not in.

3. So why is rental supply up by 15%?

If the sector isn’t growing, why are agents seeing more homes on their books?

There are four main reasons.

1. Tenant demand has cooled

Demand from tenants is lower than it was at the peak of the rental squeeze. Several factors are contributing:

• Higher living costs and squeezed budgets are limiting how much tenants can pay.

• Some choose to stay put rather than compete for a move.

• Fewer people chasing each property means listings stay online for longer.

When properties take longer to let, portal stock naturally rises, even if the underlying number of rented homes hasn’t changed much.

2. Net migration has fallen sharply

Over the last couple of years, net migration into the UK has fallen significantly from its previous peaks.

New arrivals are far more likely to rent than buy, at least initially, so:

• When migration is high, rental demand in many cities spikes.

• When migration falls back, demand eases, especially in university towns and major employment hubs.

That drop in fresh demand is a major part of why conditions feel less frantic than in 2022–2023.

3. More renters are becoming first-time buyers

Rising mortgage rates slowed the sales market, but they didn’t kill it. Many renters have pressed ahead and bought their first homes, often taking advantage of:

• Slightly lower or flatter purchase prices in some regions.

• Lenders becoming more flexible again on criteria.

• A strong desire to escape relentless rent rises.

Every time a tenant becomes a homeowner, one of two things typically happens:

• Their landlord sells the rental property to another owner-occupier, reducing PRS stock, or

• The landlord re-lets to a new tenant, and the property shows up as “new supply” on portals.

So you can simultaneously see more properties being advertised and still have no real growth in the total number of rental homes.

4. Unsold sales stock is returning to the rental market

In a slower sales market:

• Some owners who tried – and failed – to sell decide to rent out instead.

• Developers may choose to let units they can’t sell at their target price.

This pushes additional homes into the “available to rent” pool, without necessarily indicating a long-term commitment to being landlords.

4. Headwinds: why many small landlords are under pressure

If the rental market is big and demand remains solid, why are so many landlords talking about leaving?

Two big themes: tax and regulation.

Tax changes affecting buy-to-let

Over the last decade, a series of tax changes has squeezed traditional, highly leveraged buy-to-let models:

1. Mortgage interest relief restrictions (often referred to as Section 24)
   Landlords can no longer fully offset mortgage interest against rental income at their marginal tax rate. Instead, they receive a basic-rate tax credit. For higher-rate taxpayers with big mortgages, this has:

   • Dramatically increased effective tax bills.

   • Turned some previously profitable portfolios into marginal or loss-making ones.

2. Stamp duty surcharges on additional homes
   The 3% extra stamp duty on second and additional properties has:

   • Made it more expensive to buy new rental stock.

   • Reduced the attractiveness of expanding a portfolio through purchases.

3. Higher income tax on property income
   Recent Budgets have increased the tax burden further for some landlords, especially those with significant rental income outside a company structure.

Taken together, these changes mean that a landlord who entered the market 10–15 years ago is often facing much tighter margins today, even if rents have risen.

Regulatory and compliance pressures

A second major headwind is the constant tightening of rules and standards:

• The Renters’ Rights Act (and the broader reform agenda before it) aims to rebalance power between tenants and landlords, with:

  • The end of “no fault” Section 21 evictions.

  • Stricter rules on rent increases.

  • More robust enforcement powers for local authorities.

• Licensing schemes (mandatory HMO licensing, additional and selective licensing), plus:

  • Higher health and safety standards.

  • Tighter energy efficiency and housing quality requirements.

  • Heavier penalties for non-compliance.

None of this is necessarily bad policy from a tenant-protection perspective, but the impact on landlords is clear:

The cost (in time, money and risk) of being a landlord is rising – especially for small, part-time landlords without scale.

For some, especially those nearing retirement or with better uses for their capital, the simplest response is: sell up and exit.

5. Forces supporting and reshaping the PRS

For all the pressures, the PRS is not about to disappear. A few powerful forces are underpinning the sector – and changing its character.

Growth of build-to-rent and institutional ownership

One of the clearest structural trends is the rise of build-to-rent (BTR):

• Large, professionally managed blocks built specifically for renting.

• Often backed by pension funds, insurers and institutional investors.

• Concentrated in major cities and regeneration areas.

While still a relatively small share of the total PRS, BTR is:

• Growing steadily year-on-year.

• Delivering tens of thousands of new homes annually.

• Offering longer tenancies and more consistent standards in many cases.

As smaller landlords consider selling, institutions and large professional operators are increasingly stepping in.

Over time, this means fewer “accidental” landlords and more corporate, scaled ownership within the PRS.

Persistent demand from households who cannot buy

Even with some easing in demand in 2025, there are structural reasons why millions of households will continue to rent:

• Deposits and affordability tests keep homeownership out of reach for many lower and middle earners.

• Younger households in expensive regions simply cannot buy, even with two incomes.

• People in mobile professions or uncertain circumstances prefer the flexibility of renting.

Unless there is a dramatic increase in genuinely affordable housing supply – whether owner-occupied or social – the PRS will remain a critical part of the UK’s housing infrastructure.

6. What’s likely in the medium term (3–5 years)?

Putting all of this together, what do the next few years look like?

The size of the PRS

The most likely outcome is:

• No significant growth in the total number of private rented homes nationally.

• A slow net reduction in small-landlord stock, as some sell and relatively few new entrants arrive.

• Continued growth of build-to-rent and institutional portfolios, especially in urban centres.

In other words, the PRS is being reshaped more than it is being enlarged or reduced dramatically.

Rental levels and affordability

After years of very strong rent rises, especially in 2021–2023, the market now appears to be entering a phase of:

• Moderating, but still positive, rental growth.

• Rents rising in low-to-mid single digits per year in many areas, rather than the double-digit increases seen previously.

• Stronger growth where rents started from a low base, and more subdued growth (or pauses) in the very highest-cost areas where tenants simply cannot pay more.

Tenants are hitting what many commentators describe as an “affordability ceiling”. That doesn’t automatically mean rents fall; more often it means:

• Households trade down in quality or location.

• More people share homes.

• Moves become less frequent.

All of this dampens how far and how fast rents can rise from here.

Landlord and tenant experience

For landlords who remain:

• Professionalisation will accelerate – more use of limited companies, better systems, greater reliance on high-quality letting agents, and a more business-like approach to compliance.

• Tenant selection is likely to tighten, with income stability and low perceived risk becoming even more important.

• Margins will be thinner for highly leveraged, tax-exposed landlords, making voids and arrears more painful.

For tenants:

• The absolute level of rents will remain high relative to incomes in many regions, even if growth slows.

• Access to the sector may become harder for those with lower incomes, benefits, or adverse credit, as landlords become more cautious.

• Tenants in professionally managed schemes may enjoy higher and more consistent standards – but often at a premium price.

7. What does this mean for landlords and agents today?

For landlords

If you’re considering your position in the market, the key questions are:

• Can your portfolio work under the new tax and regulatory regime?

• Are you running your properties as a proper business, with realistic allowances for compliance, repairs, voids and finance costs?

• Do you have a plan for potential future changes (for example, further tightening of standards or tax rules)?

For well-capitalised, long-term landlords, the next few years could still be attractive:

• Tenant demand remains fundamentally strong.

• The exit of more marginal landlords can reduce competition.

• Professional, compliant operators are increasingly valued by both tenants and lenders.

For landlords who are heavily leveraged, highly tax-exposed, or uncomfortable with increasing regulation, a managed exit or restructuring may be the right path.

For agents

Letting agents and property managers will:

• Play an even more important role in helping landlords stay compliant and profitable.

• Need to educate landlords about realistic yields, genuine costs, and legal obligations – not just headline rents.

• Be well placed to partner with both small landlords and growing institutional players who demand professional management.

8. Conclusion: expanding, contracting – or transforming?

So, is the UK private rented sector expanding or contracting?

• Structurally: It is largely flat to gently contracting in terms of total stock, after a major expansion in the 2000s and early 2010s.

• Cyclically: Rental supply is up on the portals in 2025 because demand has cooled, net migration has fallen, and some homes have returned from the sales market – not because of a flood of new landlords.

• By composition: The sector is slowly shifting away from small, individual landlords toward larger, more professional and institutional ownership.

For anyone involved in the PRS, the key is to recognise that we are no longer in a simple “boom” or “bust” phase, but in a period of structural transformation. Those who adapt to that reality – in business model, compliance, and expectations – are the ones most likely to thrive.