The 90-night rule limits whole-property short-term lets in London to a maximum of 90 nights per calendar year without planning permission. Each night a guest stays counts towards the cap, regardless of which platform the booking came from. Airbnb automatically blocks further bookings once a London property reaches 90 nights. Other platforms may not enforce the cap automatically, so hosts listing across multiple platforms need to track their total nights manually. Exceeding 90 nights without planning permission is a planning breach and can result in enforcement action by the local council.