A 2026 guide to rent reviews, Form 4A and market-rent evidence There is no fixed percentage cap for an ordinary private-sector rent increase in England. A landlord cannot simply decide that 5%, 10% or any other figure is automatically acceptable. The central test is whether the proposed rent is defensible against the open-market rent for that property, on those tenancy terms, in that local market. Since 1 May 2026, the operational discipline around rent reviews has become mor

Rent reviews have become a sharper operational issue in 2026. For landlords, the question is not simply whether costs have risen or whether a property has been under-rented for several years. For tenants, it is not simply whether an increase feels large. The central question is whether the right rent has been proposed through the right process. There is no single percentage cap that applies across the whole United Kingdom. Housing law is devolved, and the rules in England, Wa