How much does a wet room cost?
A wetroom in south London costs £7,000 to £12,000 excluding VAT — versus £5,000–£9,000 for a conventional bathroom in the same room. The premium is structural: the floor is opened and formed to fall to a drain, and the entire room is tanked and flood-tested before tiling.
The wetroom premium is entirely below the tiles. Forming falls in a suspended timber floor means opening the structure, fitting a formed-fall board system, and rebuilding — then membrane-tanking floor and walls as one continuous envelope, then proving it with a flood test before tiling covers the evidence. None of that exists in a tray-based bathroom, and all of it is skilled time.
Within the £7,000–£12,000 range, the drivers are room size (more membrane, more tile), floor type (concrete ground floors are cheaper than timber uppers), drainage distance to the stack, and tile format — large-format and stone need falls cut as an envelope pattern, which is the most demanding tiling there is.
Quotes below £6,000 for a 'wetroom' usually describe a level-access shower area with partial tanking — the shower corner treated, the rest of the room ordinary. That can be a legitimate product, but it is not a wetroom, and it is precisely the configuration behind wetroom horror stories. Ask one question of any quote: is the whole floor tanked and flood-tested? The answer prices the risk.
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