There are signs that London's rental market may be becoming slightly more affordable for tenants, but landlords should be careful not to mistake improving affordability for easing investment conditions.

New analysis reported by the Financial Times shows that the average pre-tax salary required to rent an average property in London fell by 17% during the year to June 2026, reducing to £71,550. The improvement reflects the fact that wage growth has begun to catch up with rental inflation after several years in which rents rose significantly faster than earnings.

However, the same report demonstrates that London's rental market remains one of the most expensive in Europe. Average monthly rents increased by 3.4% in June to reach £2,385 per month, leaving London rents approximately 59% higher than the UK average of £1,500.

At the same time, survey data from the Royal Institution of Chartered Surveyors (RICS) suggests that demand for rental accommodation continues to outstrip supply. Letting agents are reporting rising tenant enquiries alongside declining landlord instructions, with respondents expecting rents to increase by an average of 2.5% over the next twelve months.

Taken together, these figures paint a more nuanced picture than the headline statistics might suggest. Tenant affordability may be improving gradually, but structural supply shortages continue to support rental values while landlords face an increasingly complex financial environment.

Improving Affordability Does Not Mean Easier Conditions For Landlords

The reduction in the salary required to rent a typical London property could easily be interpreted as a sign that pressure within the rental market is beginning to ease.

In reality, the underlying dynamics remain considerably more complicated.

The affordability improvement has been driven largely by stronger wage growth rather than falling rents. Rental prices remain close to record levels and continue to absorb a significant proportion of household income for many London tenants.

For landlords, this creates a delicate balancing act.

While strong demand continues to underpin occupancy levels, tenants' ability to absorb further rent increases may become more limited as affordability reaches practical limits. Investors therefore need to consider not only what rents could achieve today, but how sustainable those rental levels may prove over the longer term.

Supply Constraints Continue To Support The Market

One of the most significant themes emerging from recent market data is the continuing shortage of available rental property.

The Financial Times highlights RICS survey findings showing that the number of new landlord instructions remains subdued despite robust tenant demand.

This imbalance has characterised much of the private rented sector over recent years.

A combination of higher borrowing costs, tax reforms, increased regulation, tighter energy efficiency requirements and changing investment priorities has encouraged some landlords to reduce or dispose of parts of their portfolios. At the same time, population growth, changing household formation and affordability challenges within the owner-occupier market have continued to increase demand for rental accommodation.

As long as these structural imbalances remain, downward pressure on rental values is likely to remain relatively limited in many areas of London and the South East.

Rental Growth Alone No Longer Determines Portfolio Performance

Although rental income remains one of the most important measures of investment performance, it is no longer sufficient to assess a buy-to-let portfolio simply by monitoring annual rent increases.

Many landlords who have benefited from higher rents over recent years have simultaneously experienced substantial increases in financing costs.

Mortgages arranged during the ultra-low interest rate environment of previous years are increasingly reaching the end of their fixed-rate periods. Refinancing at today's borrowing costs can materially reduce monthly cash flow, even where rental income has increased.

Alongside higher mortgage payments, landlords continue to manage rising insurance costs, maintenance expenditure, compliance obligations, licensing requirements and taxation changes.

Consequently, headline rental growth can sometimes disguise weaker underlying profitability.

For many investors, net income has become a far more meaningful measure than gross rental receipts.

Why Portfolio Finance Reviews Matter More Than Ever

Rather than focusing solely on market forecasts, landlords are increasingly reviewing whether their borrowing structures remain appropriate for today's economic environment.

This involves looking beyond headline mortgage rates and considering broader strategic questions.

For example, does the current finance structure still support long-term investment objectives? Are properties held in the most appropriate ownership structure? Would refinancing improve cash flow or release capital for further investment? Could refurbishment increase rental income sufficiently to justify additional borrowing? Is the portfolio sufficiently diversified across different locations and tenant demographics?

These are the types of questions that have become central to professional portfolio management.

The objective is not simply to secure the cheapest mortgage available, but to ensure debt supports the wider investment strategy as market conditions evolve.

London Continues To Offer Long-Term Opportunities

Despite increased regulation and higher financing costs, London remains one of the UK's most resilient rental markets.

Its international employment base, constrained housing supply, diverse economy and long-term population growth continue to generate sustained demand for rented accommodation.

Many professional investors therefore continue to view London as a market offering long-term capital preservation alongside reliable tenant demand, even if short-term profitability requires closer management than in previous years.

However, investment decisions increasingly require detailed financial analysis rather than relying solely on historical market performance.

The strongest portfolios are often those that remain financially resilient under multiple scenarios, including higher borrowing costs, slower rental growth, changing tax policy and evolving regulatory requirements.

A More Sophisticated Conversation For Landlords

The latest rental data demonstrates that the London market cannot be summarised simply by saying that "rents are rising."



Affordability is improving modestly, rental demand remains exceptionally strong, supply continues to be constrained, and landlords face an increasingly complex mix of financial, regulatory and taxation considerations.

For landlords approaching the end of fixed-rate mortgage terms, reviewing refinancing options, assessing portfolio cash flow and considering future investment strategy may prove considerably more valuable than focusing on rental forecasts alone.

As the market continues to evolve, successful property investment is becoming less about predicting the next movement in rents and more about ensuring the underlying financial structure of a portfolio remains robust whatever conditions emerge.