Planning permission is not normally required for maintenance/replacement of bathrooms though if you live in a listed building you should check with your local planning authority.

If you want to install fittings such as a bath, WC, shower or washbasin within your home, or any other type of building, the building regulations will apply. Building regulations will also apply if the work involves installing an additional fitting or fittings. If you want to install, or replace your bath with, a whirlpool or spa bath, the building regulations may apply.

If you are renovating a bathroom, think about the amount of water you are going to use and how you can make sustainable choices.