How much does it cost to convert a bathroom into a wet room?
A wet room's cost is driven by the tanking (waterproofing) and drainage as much as the fittings. Get an indicative figure below.
What a wet room needs
- 1Formed floor and drainage
The floor is built to fall towards a drain (or a linear channel) — the gradient that makes it a wet room rather than a leak.
- 2Tanking
The whole wet area is fully tanked (waterproofed) behind the tiles — the single most important detail.
- 3Tiling and fit
Wall and floor tiling, a shower, WC and basin, plus ventilation. Getting the falls and tanking right is what the money buys.
A well-built wet room is a desirable, modern feature — especially as an en-suite or an accessible bathroom. Just remember the value is in the bits you can't see: the falls and the tanking. Skimp there and it's the most expensive room in the house to put right.
Wet room costs (indicative, fitted)
| Spec | What's included | Indicative cost |
|---|---|---|
| Compact wet room | Tanking, drain, basic suite | £4,000 – £6,000 |
| Standard | Fully tiled, better suite | £6,000 – £9,000 |
| High spec / large | Premium fit | £9,000 – £14,000 |
| Tanking + drainage (of the above) | the critical part | £1,200 – £2,500 |
Tanking and a correctly graded floor to the drain are non-negotiable — a failed wet room leaks into the structure.
Frequently asked questions
How much does a wet room cost?+
A compact wet room typically costs £4,000–£6,000 fitted; a standard fully-tiled one £6,000–£9,000. The critical tanking and drainage element is £1,200–£2,500 of that — and it's not where to cut corners.
Is a wet room a good idea?+
Wet rooms suit small spaces, en-suites and accessible bathrooms well. The key is faultless waterproofing — done right they're durable and desirable; done cheaply they leak into the floor below, so use an experienced installer.
Related tools & guides
Want to know how these figures are calculated? See our cost methodology.
Cost figures shown are indicative estimates, not quotations. You are responsible for verifying all costs (obtain contractor quotes) and any figures submitted to a lender. ScopeWise is a documentation tool, not financial, tax, structural or planning advice. HMO compliance prompts are guidance only — confirm requirements with your local council, as standards and licensing vary by authority.