In 40 seconds
Installing a fully tanked, level-access wet room in the UK usually costs roughly £5,000–£10,000 for a full wet room, with many projects landing around £1,500–£3,500 per square metre depending on floor build-up, the waterproofing method and how easily the waste can be routed. The waterproofing itself — the tanking — is typically £500–£1,000 in membrane and specialist labour, and the floor needs a built-in drainage fall of roughly 10–20mm per metre (about a 1:40 slope) so water runs to the drain rather than pooling. A small wet room of around 3m² often falls in the £3,000–£5,000 range. The honest answer is always a range, because it depends on your room size, subfloor and finish.
Most wet room guidance is published by companies fitting them, so the numbers tend to be optimistic and the technical rules glossed over. The pages below give honest cost ranges, explain how tanking and drainage falls actually work, compare a wet room with a shower room fairly, and set out whether a wet room suits your home — before you take a single quote. This site covers fully tanked, level-access wet rooms only.