London Rental Supply Shortage Sustains Strong Yields for Professional Investors

Prime London’s lettings market continues to be shaped by a structural supply shortage that is supporting rental growth and occupancy for professionally managed stock. Knight Frank data for the three months to August shows new listings in prime central and prime outer London running 10% below the five-year average, a pattern that has persisted since April 2021.

The Renters Rights Act, which took effect in May, has contributed to this constrained pipeline through tighter rules on rent increases, possession processes and re-letting after sales. As a result, the number of tenancies agreed across London fell 8% year-on-year, exactly matching the decline in new supply.

Higher-value segments have been less affected. New listings above £1,000 per week were 13% above the five-year average, reflecting the greater presence of discretionary owners who prefer to let rather than sell in a subdued sales market. Average rents rose 3% in prime outer London and 1.2% in prime central London over the year to August.

Tenant demand remains robust. In August, there were 8.7 prospective tenants for every new listing in prime outer London, the highest ratio in five years compared with 5.2 in prime central London. The super-prime segment above £5,000 per week also showed strength, with tenancies starting 13% above the five-year average.

Knight Frank notes that many prospective buyers are choosing to rent for a further 12–24 months while monitoring tax and policy developments. This behaviour extends the period of strong rental demand for existing professional portfolios.

For well-capitalised investors, the sustained undersupply reinforces the value of high-quality, compliant stock. Lower new supply combined with resilient tenant demand provides a favourable environment for yield stability and selective portfolio expansion over the medium term.

Investor takeaway: Persistent supply constraints in prime London, reinforced by the Renters Rights Act, continue to underpin rental performance for established landlords. Professional operators with quality assets are well positioned to benefit from elevated occupancy and measured rental growth.