The UK's rental market continues to tighten, with new figures showing advertised rents have reached fresh record highs while the number of homes available to rent has fallen below last year's levels for the first time since 2022.

According to Rightmove's latest Rental Trends Tracker, the average advertised rent for properties outside London increased to £1,397 per calendar month during the second quarter of 2026, while average asking rents across Greater London climbed to a record £2,791 per month. At the same time, the supply of rental properties entering the market declined year-on-year for the first time in four years, even as tenant enquiries remained well above pre-pandemic averages.

The figures illustrate a market where demand continues to exceed supply despite affordability pressures and higher borrowing costs.

For landlords and property investors, however, the latest data highlights a more nuanced reality. While rental income remains resilient, lenders continue to assess investment property finance using a much broader range of factors than headline rental growth alone.

Rental Demand Continues to Outpace Supply

The imbalance between available rental housing and tenant demand has been a defining feature of the UK housing market since the pandemic.

Although rental supply recovered gradually during 2024 and 2025, Rightmove's latest figures suggest that improvement has stalled.

The decline in available properties comes as tenant demand remains consistently strong across much of the country, supported by continued population growth, affordability constraints within the owner-occupier market and limited levels of new housing supply.

This combination has continued to place upward pressure on rents, particularly in regions where demand for family homes and professionally managed rental accommodation remains strongest.

For landlords with well-maintained properties in desirable locations, the market continues to provide favourable occupancy conditions.

Higher Rents Do Not Automatically Mean Easier Borrowing

Rising rental income often creates the impression that financing investment property should become more straightforward.

In reality, lender assessments have become significantly more sophisticated.

Rental income undoubtedly remains an important component of affordability calculations, but it represents only one element of a much wider underwriting process.

Lenders continue to examine stress-tested affordability, interest coverage ratios, ownership structures, portfolio performance and overall borrower experience.

They also increasingly consider property quality, licensing requirements, energy efficiency, management arrangements and local market conditions.

As a result, two landlords receiving similar rental income may experience very different lending outcomes depending upon the wider characteristics of their portfolios.

Professional Landlords Face Different Challenges

For many experienced investors, property portfolios have evolved into established businesses rather than collections of individual buy-to-let properties.

Financing decisions increasingly extend beyond securing the lowest available interest rate.

Portfolio refinancing may involve reviewing borrowing across multiple lenders, balancing debt between personally owned properties and limited company structures or releasing equity to fund acquisitions and refurbishment programmes.

Some landlords are investing in property improvements to reduce void periods, improve Energy Performance Certificate (EPC) ratings and strengthen long-term rental demand.

Others are restructuring borrowing ahead of future acquisitions or succession planning.

In each case, the objective is increasingly to improve the overall performance of the portfolio rather than focusing solely on individual assets.

The Buy-to-Let Market Continues to Evolve

The latest rental data arrives during a period of continuing change for the private rented sector.

Landlords continue to adapt to evolving regulation, changing tenant expectations and higher compliance standards while managing refinancing decisions in a more complex interest rate environment.

Although mortgage pricing has improved in parts of the market during recent months, lenders continue to apply robust affordability testing and portfolio analysis.

This means stronger rental income does not necessarily translate into greater borrowing capacity.

Instead, investors increasingly benefit from understanding how lenders assess entire portfolios, rather than viewing each property in isolation.

Portfolio Reviews Are Becoming More Valuable

For landlords with multiple investment properties, the latest market conditions provide an opportunity to review existing funding arrangements.

Some portfolios may contain older borrowing secured on relatively expensive products.

Others may have developed organically over many years, resulting in finance spread across different lenders, ownership structures and mortgage terms.

A strategic portfolio review can help identify opportunities to improve cash flow, simplify debt structures or release capital for future investment while ensuring borrowing remains aligned with long-term objectives.

It can also highlight whether particular properties are supporting overall borrowing capacity or limiting future financing options.

Strong Rental Markets Still Require Strong Finance Strategies

Rightmove's latest report reinforces that demand for rental accommodation remains resilient despite affordability challenges facing many tenants.

Record rents and constrained supply continue to support the long-term fundamentals of the private rented sector.

However, the figures also serve as a reminder that successful property investment depends on more than rising rental income.

Professional landlords are increasingly operating in an environment where finance strategy, portfolio management and regulatory compliance are becoming just as important as rental growth itself.



As the market continues to mature, ensuring borrowing arrangements evolve alongside a portfolio may prove every bit as valuable as identifying the next investment opportunity.