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PLANNING GUIDE

How to build a wetroom

A planning overview of the floor, drainage and waterproofing decisions to make before work begins.

How to build a wetroom

Use this guide to prepare for a conversation with your installer.

Start with the room

Bring a dimensioned sketch to your installer. Show the shower, doorway, fittings and existing waste position. Add your preferred tile finish, whether you want floor heating, and any access needs.

Agree the scope before choosing individual products: what will remain, what needs removing, and which trades will be involved?

Check the floor and drainage

A wetroom depends on a stable floor and an effective route for wastewater. Ask your installer to check available depth, the position of the drain and the transition to the adjoining room. The tray or screed design must direct water to the drain.

The visible cover is only one part of the assembly. Confirm that the trap, waste connection and floor system work together.

Planning reference: Impey wetroom FAQs.

Plan the waterproof layer

Waterproofing sits behind the finish and needs a continuous, compatible treatment at the floor, wall junctions, penetrations and drain. Ask the installer to define the required coverage and follow the chosen system's instructions for preparation and sealing.

System details: Impey waterproofing guidance.

Agree the finish and handover

Choose tiles suited to the wetroom and discuss slip resistance, ventilation and cleaning access. Keep the selected product instructions, warranty information and relevant test records together.

Before signing off, walk through the room with the installer and ask how to maintain the drain and finished surfaces.

Design reference: Impey's wetroom design considerations.

Planning guidance, not installation instructions. Product-specific instructions and an on-site assessment take priority. Confirm suitability before purchasing or starting work.

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