Wet-Room Waterproofing in England: Part C and the Project Detail

The requirement

England’s Part C does cover water from sanitary fittings. Requirement C2(d) includes harm from spilled water from fittings and fixed appliances. Approved Document C repeats that duty in paragraph 0.2(d). It is wrong to say the rules stop at the outside walls.

The document does not give a complete shower-tanking system or one membrane height for every bathroom. A project still needs a suitable wet-room detail. A product data sheet helps with that detail; it does not replace the law.

What to check

• Confirm the substrate and how much water the floor and walls will face.
• Specify a membrane that suits the job, joints, drain, door and pipe seals.
• Check the current tiling standard and the system’s declared use. Do not assume a wall-tiling standard covers every wet-room floor.
• Follow the maker’s thickness, drying and test instructions. Keep a record before the tile covers the work.
• Check warranty terms as well as building-control rules.

This page covers England. Wales, Scotland and Northern Ireland have their own documents. Use the UK hub to select the right nation.

Sources

• Approved Document C, Requirement C2(d) and paragraph 0.2(d).
• Government publication and current download.

Checked on 6 September 2026. The paid standards and a chosen product were not checked. This page does not approve a wet-room design.