The UK rental market has been driven by one defining trend in recent years: rents rising at an unprecedented pace as strong tenant demand has collided with a chronic shortage of homes.

While rents are still increasing across much of the country, the pace of growth is easing. However, rather than asking whether rents will continue to rise, many landlords are now asking how much further they can realistically go.

The latest Office for National Statistics (ONS) figures show average UK private rents increased by 3.3% in the year to May, continuing the gradual slowdown from the much stronger growth recorded during 2022 and 2023.

Meanwhile, Zoopla reports that rents agreed on new tenancies are now rising by about 2.1% annually, a marked contrast to the double-digit increases seen during the post-pandemic rental surge. The portal expects rental inflation to remain between 2% and 3% during 2026, reflecting a market that is becoming more balanced as affordability limits further growth.

Demand itself has not weakened significantly. Competition for well-priced rental homes remains intense in many parts of the UK. Zoopla estimates that rental stock remains between 20% and 30% below pre-pandemic levels across every region, ensuring supply continues to underpin rental values even as growth slows.

Affordability is becoming the market's natural brake. After years of consecutive rent rises, combined with higher household bills and wider cost-of-living pressures, many tenants are approaching the limit of what they can afford. Earnings have improved, but not enough to provide unlimited capacity for further rent increases. Landlords are also finding that pushing rents too high risks longer void periods, reduced demand or higher tenant turnover.

At the same time, landlords continue to face mounting costs of their own. Mortgage rates remain elevated for many borrowers, insurance premiums have risen, maintenance and repair costs continue to increase, while licensing schemes and regulatory compliance place additional financial and administrative burdens on landlords. Uncertainty over future energy efficiency requirements also remains firmly on the agenda.

For several years, rising rents helped offset many of these additional costs. That is becoming less straightforward.

The national picture also masks significant regional differences. Lower-cost markets across parts of the North of England, Scotland and Wales continue to record relatively healthy rental growth, reflecting greater affordability headroom. In contrast, the ONS reports that London recorded the weakest rental inflation in England, at just 2%, highlighting how higher-cost markets are cooling faster than many more affordable areas.

But that headline disguises very different conditions within the city itself. Analysis by London agency Harvey W James suggests the capital has become a "split market". While some prime central locations are seeing rents stabilise or even soften after exceptional post-pandemic growth, regeneration hotspots and more affordable outer boroughs continue to record healthy increases as tenants seek better value. For landlords, relying on London-wide averages risks overlooking significant differences at borough level.

It also reinforces that national and even regional averages are becoming less useful as indicators of rental performance. Local market conditions, tenant demand and affordability now play a much greater role in determining achievable rents.

Taken together, these trends suggest the rental market is entering a more balanced phase. Supply shortages continue to underpin rental values, but affordability is increasingly setting the pace of future growth.

If rental inflation continues to moderate while operating costs remain elevated, pressure on landlords' margins is likely to increase. Some investors may delay acquisitions, scale back expansion plans or reassess the long-term viability of parts of their portfolios. Over time, that could further restrict the supply of rental homes, creating the conditions for renewed upward pressure on rents.

The period of consistently strong, above-inflation rental growth appears to be drawing to a close. For landlords, the focus is shifting away from how much rents can be increased each year towards achieving sustainable returns in a market where tenant affordability is becoming the defining constraint.