London's 90-day rule limits entire home short-let listings across all 32 Greater London boroughs to a maximum of 90 nights per calendar year without planning permission. It is established under the Deregulation Act 2015 and resets on 1 January each year. Hosted stays, where the owner remains present, are exempt. Airbnb automatically blocks entire-home listings at 90 nights. Breaching the limit without planning permission carries fines of up to 20,000 pounds per offence. Nights count across all booking platforms combined, not per platform individually.