Analysis by Propoly found an estimated 122,659 rental properties listed across England in August 2026, up from 114,178 in August 2025.
However, there are significant differences between local markets, with rental listings almost doubling in Tyne and Wear.
The number of properties listed for rent in the area increased by 86.6%, from 1,855 in August last year to 3,462 this month.
Greater Manchester recorded the second largest increase, with rental stock rising by 28.4%, followed by Rutland at 23.1% and the City of London at 21.5%.
Somerset saw listings increase by 20.4%, while Northumberland recorded growth of 19%. Rental stock in Wiltshire and Hampshire increased by 18.4%, followed by Worcestershire at 18.3% and Leicestershire at 17.3%.
The figures suggest landlords in some of these markets are competing against a substantially larger number of available properties than a year ago, potentially increasing the importance of pricing and property condition when attracting tenants.
However, the picture varies significantly across England, with several areas recording falls in rental availability.
The Isle of Wight saw the largest reduction, with listings falling by 35.2% year on year. Warwickshire recorded a 10.8% decline, while rental stock fell by 9.6% in Norfolk.
Listings also decreased by 9.3% in West Yorkshire, 9.1% in Suffolk and 8.9% in East Sussex. Shropshire recorded a 5.6% fall, while availability declined by 5.2% in Devon and 4.5% in Staffordshire.
The figures indicate increasingly different conditions for landlords depending on where their properties are located, with some markets experiencing substantial increases in rental availability while others have seen stock contract.
Sim Sekhon, group CEO at Propoly, said: "The increase in Tyne and Wear is striking, particularly when set against the more measured rise seen across England as a whole. While greater availability should provide tenants with more choice, the extent of the increase also underlines how quickly local rental markets can change.
"What is clear is that there is no single national rental market. Agents in areas such as Tyne and Wear are managing a significant expansion in available stock, while those operating in other parts of the country are contending with considerably fewer listings than a year ago.
"For agents seeing stock levels rise, this presents a clear opportunity, but it also means more properties and prospective tenants to progress. Having efficient systems in place will be crucial if agents are to manage that additional workload and convert greater availability into successfully completed tenancies."
