Most internal bathroom reconfigurations do not need planning permission. The things to check are building regulations, and — in a flat — your lease.
Building regulations
Moving a WC within a room is generally not notifiable in itself, but the associated work often is: new drainage connections, and any electrical work in the bathroom, must meet the regulations and be certified. Whoever does the electrical work should be able to self-certify or arrange inspection.
Flats and leases
Many leases restrict altering "wet areas" or moving them over a neighbour’s habitable room, and some require freeholder consent for bathroom works. Check your lease before you commit to a layout.
Listed buildings and conservation areas
Internal alterations to a listed building can need listed building consent even if they are invisible from outside. Conservation area status mainly affects the exterior.
TileDegree flags anything that applies at the survey and handles certification for work we carry out. This article is general information, not legal advice.
Published 1 March 2026.