A wet room turns the entire room into a waterproofed wet zone, with the shower area open to the rest of the floor and no shower tray, screen or door separating it. Water drains through a linear or central gully cut into the floor structure, with the whole substrate tanked beneath the tiles. Done well, the result is a clean, low-threshold space that suits modern design tastes and works for accessibility.
Done badly, a wet room is a slow leak waiting to find the ceiling below. The waterproofing detail, the tanking under the tiles, the falls toward the drain, and the correct sealing at junctions, is the difference between a wet room that lasts twenty years and one that fails inside two. This is where in-house trades matter: getting the fall right, getting the tanking right, and getting the tile detail right are three different specialisms that all have to talk to each other.
Every wet room starts with the floor. The existing structure has to take a fall toward the drain, which usually means cutting into the joists or screed to accommodate the new substrate. We use a marine-grade waterproof board over the floor, with tanking membrane and reinforcement at every junction, corner and pipe entry. Walls in the shower zone are tanked at least 200mm above the highest spray point.
Drainage is sized for the shower flow rate, not specced from a catalogue. The visible finish, whether that's porcelain large-format tiles, micro-cement, or natural stone, is the last thing to go in. By that point the wet room is already waterproof; the finish is decoration over a properly engineered substrate.
A standard wet room build takes three to four weeks from strip-out to handover. The first stage is structural: opening the floor, adjusting the falls, replacing or reinforcing the substrate, and running plumbing and drainage. The middle stage is the waterproofing itself: boarding, tanking membrane, reinforcement at all junctions, and pressure-testing the drainage before tile work begins.
If the wet room is replacing your only bathroom, your toilet is normally re-plumbed and reinstated early so it can still be used out of work hours, with the kitchen sink covering handwashing and brushing teeth. The shower itself is the part you'll be without for the longest, typically up to three weeks depending on the finish. Wet rooms with bespoke linear drains, large-format tiles or micro-cement finishes can extend that further because of material lead times and curing periods. We give you a realistic timeline at the quote stage rather than an optimistic one.
Wet Room Installation Across NW London
Wet room installations across Ruislip, Pinner, Northwood, Uxbridge, Harrow, Watford, Rickmansworth, Amersham, Ealing and Beaconsfield. We cover the wider NW London area where the team can reach a site easily.
Wet room cost depends on the existing floor structure, the size of the room, the drainage detail (linear vs central gully, recessed vs proprietary), the substrate and tanking spec, and the finish you choose. A small bathroom converted to a wet room is at the lower end. A large family bathroom with bespoke drainage, large-format porcelain and full underfloor heating is at the upper end.
Because wet rooms involve more structural and waterproofing work than a standard bathroom refurbishment, they typically sit at a higher price point than a like-for-like fitting job. We'll give you an itemised written quote after a free site visit, so you see exactly what the floor work, tanking, drainage and finish each cost.
Not every bathroom should be a wet room. They work brilliantly in ground-floor cloakrooms, master ensuites where the look matters, and accessibility-focused bathrooms where a level threshold makes daily life easier. They work less well as the only family bathroom in a busy household, simply because the open shower area means the rest of the room gets wet during use.
If you're undecided between a wet room and a more traditional full bathroom refurbishment, we'll talk it through at the site visit. There's no right answer that applies to every property; it depends on how you use the space, who else is in the house, and what the existing floor structure can take without significant alteration.
Tell us about the room and what you're hoping to do. We'll arrange a free site visit, assess the floor structure and drainage options, and follow up with an itemised written quote.
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