Wet Room Cost: What Really Drives the Price

Across the districts we cover, from Gloucester and Cheltenham to Stroud, Tewkesbury, Stonehouse, Malvern, Ledbury, Newent and Ross-on-Wye, the biggest swing in wet room pricing comes from the building rather than the finish. A newer home with a solid ground floor is the most straightforward case. An upstairs bathroom in a Victorian terrace or an older stone cottage, on suspended timber joists, needs the floor strengthened and a former built in before any tanking, and that is where the price climbs.

The other local variable is the waste route. Where the soil stack sits on an outside wall close to the shower, drainage is simple. Where the waste has to cross the room or run between joists, it takes longer and costs more. We check both on the survey, so the written quote reflects your floor and your pipe run rather than an average.

If the wet room figure is more than you want to spend, a walk-in shower with a low-profile tray gives a similar open look for considerably less, because the water is contained in the tray and only the shower zone needs full waterproofing. Our wet room versus walk-in shower guide sets the two side by side, including the hidden costs people tend to miss, so you can decide which is worth it for your room.

A wet room conversion in an existing bathroom footprint starts from around £5,500 for a straightforward room on a solid floor, with a typical project coming in at about £9,200. The premium over a standard refit comes almost entirely from floor structure work, tanking and drainage rather than the visible fittings.

Complex wet rooms, with large-format porcelain, a bespoke glass screen, significant joist or screed work and a long waste run, can reach around £17,000. The floor and drainage work doesn't change much between budget and high-end specifications, it's the structure, tiling and screen choices that push the top of the range up.

A true wet room needs the floor to fall gently towards a drain, which usually means either dropping the floor structure or building up the rest of the room to create the fall. On a ground floor with a solid concrete slab, this can mean breaking out and re-forming part of the floor, a job that adds £800-£2,000 depending on how much of the room needs altering.

On a timber suspended floor, joists sometimes need notching or a section rebuilding to accommodate the drain and falls, which is more involved than concrete but can be cheaper if only a small area needs changing. Either way, this structural stage is the part most likely to be underestimated in a low quote.

Wet rooms need a point drain or linear drain set into the floor, connected to a waste run that can cope with the flow rate of an open shower area rather than a contained tray. If the existing soil stack is close by, this is straightforward. If it isn't, pipework has to travel further, sometimes needing a pump if gravity fall isn't achievable, adding £300-£800 to the job.

Getting the drain position and fall right the first time matters more in a wet room than almost anywhere else in the house, because a shallow fall or slow drain isn't something you can easily fix once tiling is down.

Full tanking, waterproofing the entire floor and all walls to shower height, is standard practice for a wet room and typically adds £600-£1,200 in materials and labour compared with the localised waterproofing used in a standard shower enclosure. This isn't optional in a room with no shower tray or enclosure containing the water.

Tanking quality is the single biggest factor in whether a wet room lasts or causes problems years later, and it's exactly the kind of work that's easy to skimp on because nobody can see it once the tiles go down. Ask any fitter what tanking system they use and how far up the walls it's applied.

Because a wet room floor is fully exposed and usually flows into the shower area with no step or curb, tile choice and cutting are more demanding than a standard bathroom. Small-format tiles or mosaics are often used on the floor specifically because they cope better with the falls towards the drain, while walls can use larger format tiles.

A frameless glass screen, rather than a full enclosure, is the typical finishing touch and usually costs £400-£900 supplied and fitted, less than a full shower enclosure would, which offsets some of the structural premium elsewhere in the job.

Wet rooms suit ground floor rooms with good access to drainage and households who want a low-threshold, easy-access shower space. They're less cost-effective in upstairs rooms with limited structural depth to create falls, or in rooms where the floor build-up would leave an awkward step into an adjoining room.

If accessibility and future-proofing aren't the priority, a well-built walk-in shower enclosure with a tray can achieve a similar look for less, without the structural floor work. It's worth discussing both options at a free design and quote home visit before committing to one approach.