Can Your Bathroom Be Converted to a Wet Room?
Most bathrooms can be made into wet rooms, but not all. Success depends on floor structure, position, and drainage access.
Floor structure matters most. Timber suspended floors (those built on wooden beams) need reinforcing and marine ply (a water-resistant plywood) boarding before tanking (waterproofing). Concrete ground floors are already solid enough for waterproofing and tiling. In the 1960s and 70s, upstairs bathrooms in semis around Bucklands Drive, Sunnymede Road, and Nailsea Park estates used timber joists (horizontal supporting beams) and needed proper preparation. Ground-floor bathrooms in bungalows around The Perrings and Mizzymead sit on concrete slabs (large, flat concrete foundations), which is an easier start.
Room position affects waterproofing. Upstairs bathrooms over living spaces require strict tanking. Water getting through upstairs damages the ceiling below, so every layer must be right.
Check drainage access. Waste pipes need enough gradient for flow. If the room is too small or waste runs are hard to reach, a wet room may not suit.
Not every bathroom is suitable, and I’ll always tell you honestly rather than begin a job that won’t work. If a wet room isn’t right, a bathroom renovation with a standard shower or walk-in enclosure may be better. A site visit confirms what’s possible.
Mike fitted a stunning wet room for us. He made a brilliant job of it. Workmanship is top class. He is extremely reliable and I couldn’t recommend him more.
Erika B (Facebook)
Why Waterproofing Is the Most Important Part of a Wet Room
In a wet room, the entire room is the shower. Without a tray or enclosure, all walls, floors, and junctions must be fully waterproofed—not just the area around the showerhead.
Tanking membrane, a waterproof layer applied to prevent water ingress, covers the floor and extends up the walls. Every corner, joint, and pipe is sealed using waterproof tape and membrane. No gaps or shortcuts. Water penetration damages the structure below; this damage is only visible when severe.
The floor gradient guides water to the drain. No pooling or standing water. The gradient must be precise: too shallow and water remains; too steep and it’s awkward. This step takes skill.
Wet rooms don’t leak when properly installed. Every leak I’ve seen comes from poor preparation or missed tanking steps, such as unsealed corners, low membrane, or unprotected pipes. When every layer cures, the room stays dry.
The difference between a wet room that lasts 20 years and one that fails in two lies here. Everything after—tiling, fixtures, finishing—depends on the waterproofing. If this step is right, the rest holds up.
What a Wet Room Installation Involves
Here’s the sequence I follow on every wet room installation, from strip-out to handover.
Strip-out. Remove the existing suite, tiles, flooring, and damaged plaster. This exposes the structure, so I know exactly what I’m working with.
Floor preparation. Reinforce and board timber floors with marine ply (a durable, water-resistant plywood) for a rigid base. Level and clean concrete floors (floors made from poured concrete). The floor must be perfect before proceeding.
Tanking. Apply membrane to the floor and up the walls, sealing all joints, corners, and penetrations. Allow to cure before tiling.
Gradient and drain installation. The floor is built up to create a fall towards the drain point. The gradient is checked to make sure water flows cleanly without pooling anywhere.
Wall preparation. Make walls good, skim where needed, and prepare for tiling.
Tiling. Tile walls, then floors. Use non-slip floor tiles and make precise cuts at the drain.
Fixtures and fittings. Install and connect the shower valve, showerhead, basin, toilet, towel rail, and accessories.
Final sealing and snagging. Check every seal, grout, and fixture. Test the drain under full flow for proper gradient.
I handle every stage—no subcontractors, no trades gaps, no waiting.
A wet room installation usually takes two to three weeks because of the additional waterproofing and floor preparation. During this period, the bathroom is out of use, so if it’s your only one, plan accordingly. I’ll provide a realistic timeframe before starting.