Wet Room vs Shower Tray — Which Is Right for Your Bathroom?

I’ve installed both over the years — a lot of both. The choice isn’t always obvious, and the wrong decision tends to become apparent within a year when either the shower tray cracks or the wet room floor doesn’t drain properly.

Here’s what actually matters.

What a shower tray is

A shower tray is a pre-formed base — stone resin, acrylic, or ceramic — that sits at floor level and contains the water within a defined area. You tile (or panel) the walls around it, silicone the joint between tray and walls, and the water goes to a drain in the tray.

The main advantage is simplicity. The tray is a finished product. It doesn’t need waterproofing work underneath, it doesn’t need a graded floor. The joint between tray and tiles is the only critical seal.

The weakness is that joint. Silicone breaks down over time — typically 5 to 10 years in a heavily used shower. When it goes, water gets behind and you get damp and eventually mould. I see a lot of bathrooms where this is the cause of problems.

What a wet room is

A wet room is a fully tiled, fully waterproofed shower area with no tray. The floor is graded — usually around 1.5% gradient — so water runs to a drain. The entire floor and lower walls are tanked (waterproofed) before tiling begins. If you want to understand what tanking actually involves, there’s a separate guide here.

Done properly, it lasts far longer than a shower tray. There’s no silicone joint to fail, no tray to crack. The waterproofing is built into the substrate, not sitting on top of it.

The downside is cost and complexity. Tanking takes time and materials. The graded floor has to be formed correctly — if the gradient is wrong, water sits in the room rather than draining. The drain position matters. A badly installed wet room is worse than a badly installed shower tray because the remedial work is harder.

Which suits which bathroom

Shower tray makes more sense when:

• The floor is timber or has some flex in it — wet room installations on flexing timber floors are risky
• The budget is tighter and the bathroom isn’t used heavily
• You want a quick, clean result with less disruption

Wet room makes more sense when:

• The floor is solid concrete or block — ideal substrate for tanking
• Accessibility matters — no threshold, no tray lip
• You’re using high-quality tiles and want the whole room to look unified
• It’s a main bathroom that gets daily use

The floor question

This is the thing most people don’t ask about but should. A wet room on a concrete floor is straightforward. A wet room on a timber floor needs the joists assessed, potentially noggings added for rigidity, and a decoupling membrane as part of the build-up. Not impossible, but it adds cost and you need a tiler who knows what they’re doing.

If you’re in an older property — Victorian, Edwardian — the floors are almost always timber. I’ve done wet rooms in these houses but I always check the joist structure first.

Cost difference

A wet room costs more than a shower tray installation. The tanking materials, the time to apply them correctly, the skill involved in grading the floor — all of that adds to the price.

As a rough guide, a wet room conversion typically costs 20–40% more than a comparable shower tray installation, once materials and labour are included. The materials cost (tiles, adhesive, grout, tanking membrane, linear drain) also tends to be higher.

Whether it’s worth it depends on the floor structure, your budget, and how long you’re planning to stay in the house. If you’re selling in two years, a well-installed shower tray is fine. If you’re staying, a wet room done properly is the better long-term investment.

I offer free site visits for exactly this kind of decision — it’s easier to give you a straight answer once I’ve seen the bathroom.

For more detail on wet room installation or to understand how much a bathroom re-tile costs in London, there’s more on both of those elsewhere on the site.