The short answer
A fully tanked, level-access wet room in the UK typically costs around £5,000–£10,000 for a full wet room, with many projects working out at roughly £1,500–£3,500 per square metre depending on the floor build-up, waterproofing method and how easily the waste can be routed. Within that, the tanking and waterproofing is usually £500–£1,000, drainage and plumbing changes commonly add £500–£1,500, tiling and finishes £1,500–£4,000, and labour often accounts for 40–60% of the total. A small wet room of around 3m² often falls in the £3,000–£5,000 range. The main drivers are room size, the subfloor (timber or concrete), the drainage route and the finish you choose.
Price depends mainly on the size of the room, the subfloor you are tanking, how far the waste has to run, and the finish. The figures below are typical UK ranges for guidance, not quotations.
Typical UK ranges
- Full wet room£5,000–£10,000
- Per square metre£1,500–£3,500
- Small wet room (~3m²)£3,000–£5,000
- Tanking & waterproofing£500–£1,000
- Underfloor heating~£300–£400 per room
What drives the price
- Room size: you pay largely per square metre, so each extra metre of floor and wall to tank and tile adds roughly £500–£900.
- Subfloor: a timber floor usually needs a rigid former and reinforcement before tanking; a concrete floor can often be chased and falls formed in the screed.
- Drainage route: moving the waste or cutting a new gradient into the floor adds time and cost, especially upstairs.
- Finish & extras: tiles, glass screen, underfloor heating and ventilation all move the figure.
| Item | Typical range | Notes |
|---|---|---|
| Full wet room | £5,000–£10,000 | varies by size & subfloor |
| Per square metre | £1,500–£3,500 | floor build-up & waste routing |
| Tanking & waterproofing | £500–£1,000 | membrane & specialist labour |
| Drainage & plumbing | £500–£1,500 | new falls or relocated waste |
| Tiling & finishes | £1,500–£4,000 | tile choice & area |
Indicative UK ranges for guidance. Sourced UK guidance from Checkatrade and MyJobQuote wet room cost guides.
Why the range is wide
A wet room is a waterproofing job as much as a tiling one, so the price turns on things you cannot see in a brochure: the condition and type of the subfloor, whether the falls can be formed in screed or need a pre-made former, and how far the drain sits from the existing soil stack. Because labour is typically 40–60% of the total and the tanking has to be done meticulously, a measured survey gives the only accurate figure. Treat the ranges here as a sense-check before you take quotes.
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Frequently asked questions
How much does a wet room cost in the UK?
A fully tanked, level-access wet room typically costs around £5,000–£10,000, with many projects working out at roughly £1,500–£3,500 per square metre depending on room size, subfloor and how easily the waste can be routed.
How much of the cost is tanking?
The tanking and waterproofing is usually £500–£1,000 in membrane and specialist labour. Drainage and plumbing changes commonly add £500–£1,500, and tiling and finishes a further £1,500–£4,000.
Why is the wet room price range so wide?
Because rooms differ. The size of the room, the subfloor type, the drainage route and the finish all move the figure. A measured survey gives the accurate number for your room.
Sources & further reading
Figures on this page are typical UK ranges drawn from published sources and depend on your specific room. They are guidance, not a quotation.