Wet Room Cost UK (2026): Prices by Room Size, Tanking and Timber Floors

Quick Answer: How Much Does a Wet Room Cost in the UK?

A standard wet room conversion in the UK typically costs £4,000 to £13,000, and the wide range is the first thing to understand, because it is not a mistake in the guides. It reflects three different jobs that all get called a wet room: a straightforward conversion of an existing bathroom, a larger or higher-specification room, and an accessible wet room fitted for mobility needs.

The published 2026 guides cross-checked for this article sit in different parts of that range for a good reason. MyJobQuote puts the average wet room installation at around £5,500, within a £4,000 to £7,000 range for a standard conversion, and says most jobs take 4 to 7 days. Checkatrade, updated in June 2026, gives a broader £5,000 to £13,000 range with an average of around £9,000, and prices a wet room at £1,800 per m² on its table. EA Mobility, writing about accessible wet rooms in October 2026, prices those at £8,000 to £14,000 and more, because pumped drainage, safety flooring and accessibility fittings are part of the job, not extras added on top.

Read together, the sensible planning figure is this: budget £5,000 to £9,000 for a standard wet room conversion in an existing bathroom in reasonable condition, expect £4,000 to £7,000 at the simpler end where drainage and the floor are already favourable, and expect £10,000 or more once you add pumped drainage, a timber upstairs floor, underfloor heating, or a full accessible specification. Treat any quote far below £4,000 with suspicion, because the waterproofing work that makes a wet room work cannot be done properly for very little, and treat any single figure without a breakdown as a starting point for questions, not as a price.

A wet room is not a shower with the tray left out. It is a room where the whole floor is the shower floor, formed to fall gently towards a drain, and waterproofed across the floor and up the walls so water that lands anywhere in the room drains away instead of soaking into the structure. That build-up, not the shower or the tiles, is what you are paying for, and it is why this article starts with construction before it gives prices by room size.

How a Wet Room Is Built: Former, Gradient and Tanking

Every wet room, whatever its size or finish, is built from the same three elements, and a quote that does not mention all three is incomplete.

First, the former. This is the shaped tray or board that creates the fall in the floor. On a concrete ground floor, the fall can be formed in screed, a layer of sand and cement laid to a slope. On a timber floor, a pre-formed former board is usually cut into the floor so the finished floor sits at the right level without raising the whole room by an awkward step. The fall itself is gentle, typically around 1 in 60 to 1 in 80, enough for water to run to the drain without the slope being noticeable underfoot, but it has to be consistent. A floor that is flat in places will pond, and ponding water is what leads to the leaks and smells that give wet rooms a bad name.

Second, the gradient needs a drain that can take the water away fast enough. That means a gully, usually a linear drain along one wall or a central point drain, connected to the soil and waste pipework with enough fall of its own. If the existing waste pipe is close and at the right level, drainage is straightforward. If the waste has to travel a long way, or the floor level leaves no room for a gravity fall, a pumped waste unit is needed, and that is one of the biggest single cost jumps in a wet room project. Our shower pump installation cost guide explains pumped drainage in more detail, but the point for budgeting is simple: gravity drainage is cheaper and more reliable, and pumped drainage should be a surveyed decision, not a surprise on the invoice.

Third, tanking. Tanking is the waterproofing system that turns the room into a sealed container. A liquid-applied membrane is painted or rolled onto the floor and up the walls, usually to at least the shower zone and often across the whole floor, with reinforcing tape at joints and corners. Sheet membrane systems do the same job with bonded sheets instead of a liquid coating. Either way, the membrane goes under the tiles or wall panels, and it is the layer that actually keeps water out of the structure. Tiles are a finish, not waterproofing. A beautifully tiled wet room with poor tanking will leak, and the leak will usually show up downstairs, months later, when the repair means lifting the floor.

On top of those three elements sit the visible parts: the shower valve and head, a glass screen if one is fitted, the toilet and basin, ventilation, and heating, often underfloor heating because radiators are awkward in a room where every wall may get wet. Each of those is priced in the room-size table below, but none of them matters if the former, the fall and the tanking are wrong. When you compare quotes, compare those three lines first.

Tanking Systems Compared: Liquid, Sheet and Pre-Formed

Tanking is the one part of a wet room where saving money is most likely to cost more later, so it is worth knowing the options by name before a fitter recommends one.

Liquid-applied tanking is the most common system in UK conversions. A primer goes down first, then two or more coats of a flexible waterproof coating, with jointing tape embedded at wall-to-floor junctions, around pipe penetrations and at corners. It suits awkward shapes and existing rooms well, because it can be painted around pipes and into corners that a sheet would struggle with. Its weakness is that it depends entirely on the applicator: a thin coat, a missed joint or a coat applied over dust or damp will fail, and you cannot see the failure once tiles are on top. Ask what product is being used, how many coats are specified, and whether the fitter will photograph the tanking before tiling. Those photographs are your only evidence that the most important layer in the room was done properly.

Sheet membrane tanking uses rolls of waterproof membrane, bonded to the floor and walls with adhesive and sealed at overlaps. It gives a consistent thickness, which is its main advantage, and it is less dependent on brushwork than a liquid system. It is harder to fit neatly around complex shapes, soil pipes and awkward corners, and the joints between sheets are the critical point, so it suits squarer rooms and new-build or fully stripped rooms better than fiddly conversions. Some systems combine the two, with sheet on the floor and liquid at the joints and upstands.

Pre-formed wet room kits, built around a factory-made former with a bonded membrane, sit between the two. The former itself is waterproof, the fall is already formed, and the fitter tanks the joints to the surrounding floor and walls. They are popular for upstairs timber floors, covered in the next section, because they keep the floor build-up thin and the weight down. Their limitation is size and shape: a kit suits a standard shower zone, not a room where the whole floor needs to be the shower floor in an unusual shape.

No system is automatically the best, and a fitter who only ever fits one system will recommend that system. The right question is not which brand, but whether the system suits your floor type, whether the whole floor and the shower zone walls are tanked or only part of them, and what guarantee covers the tanking itself rather than just the tiles. A guarantee on tiles that excludes the waterproofing underneath is not a wet room guarantee.

Upstairs and Timber Floors: Where Wet Room Costs Jump

A ground-floor wet room on a concrete slab is the simplest wet room to build, and the prices at the lower end of the range usually assume something like it. An upstairs wet room on a timber floor is a different job, and it is where many budgets go wrong.

The problem is height and strength. A timber floor has joists with gaps between them, and a wet room floor has to be solid, level in the right way, and able to carry the weight of the former, screed or boards, tiles and a person, without flexing. Flexing cracks grout and breaks tanking seals, so the floor usually needs strengthening first: noggins between joists, a thicker structural board, or in some cases sistering joists, which means fixing a second joist alongside an existing one. That is carpentry work before any waterproofing starts, and it adds both labour days and cost.

Drainage is the second upstairs problem. A ground-floor room can usually find a gravity fall to the soil stack. Upstairs, the waste pipe has to run through the floor void and down, and there may not be enough depth under the floor for both the former and the pipe fall. If there is not, the options are to raise the floor level, which creates a step into the room and can cause problems with door heights, or to fit a pumped waste unit, which adds the cost of the pump, its housing and its maintenance. Neither option is a reason to avoid an upstairs wet room, but both should be surveyed and priced before work starts, not discovered when the floor is already up.

Weight and water together are the third concern. A wet room upstairs puts a waterproof room above a ceiling below, so a leak does more damage and is harder to spot early. That is why the tanking standard matters more upstairs, not less, and why a leak detection point or an access panel to the drain and trap is worth asking for. It is also why upstairs wet rooms are sometimes the wrong choice for a room directly above a kitchen or a room with expensive finishes below, unless the homeowner accepts the higher specification and cost that the risk justifies.

As a budgeting rule, add a clear allowance for an upstairs timber-floor wet room over a ground-floor concrete one, and expect the fitter to explain exactly what that allowance buys: floor strengthening, a pre-formed former, pumped or re-routed drainage, and full tanking. If a quote for an upstairs wet room is the same as for a ground-floor one, ask what has been left out.

Wet Room Cost by Room Size

The table below uses MyJobQuote’s 2026 room-size figures as its backbone, because they are the clearest published breakdown by size for a standard conversion, and sets them against the broader Checkatrade and accessible ranges so the reader can see where a simple conversion ends and a higher-specification job begins.

A few lines in any quote deserve separate attention, because they are where a low headline price often hides later costs. Labour is the largest single share: MyJobQuote puts it at 30% to 40% of the project cost, or roughly £1,700 to £2,000 on an average £5,500 job, and Checkatrade prices wet room labour at £240 to £320 per day. Tanking and floor formation are the next most important lines, and a recent specialist guide prices a tanking membrane system at around £600 to £1,500 in materials and application, with gradient floor-forming adding a further £400 to £1,200. Floor replacement on its own, where an existing wet room floor has failed, is put at around £1,200 by Checkatrade, which is a useful warning about the cost of getting tanking wrong the first time.

Other lines that move the total include moving the toilet or basin, which means soil pipe work, adding underfloor heating, upgrading to a thermostatic shower with a high flow rate, and the finish itself. Large-format tiles, feature walls and glass screens all add cost, and wall panels are often cheaper and quicker than full tiling, which is one reason they are common in accessible conversions. Ventilation and electrics are not optional extras: a wet room needs an extractor fan that actually clears steam, and any electrical work in a bathroom falls under Part P of the Building Regulations, so it must be done or certified by a competent person. Ask for those lines to be itemised rather than bundled into a single figure.

Finally, remember that a wet room is usually part of a wider bathroom job, not a standalone purchase. If you are budgeting for the whole room, our bathroom renovation cost guide sets the wet room figures in the context of a full renovation, and if the wet room is in a new ensuite rather than a replacement bathroom, our cost of adding an ensuite guide covers the extra plumbing and building work that comes with a new room.

Wet Room vs Walk-In Shower: Which Should You Choose?

This is the decision most readers are actually making, and it is worth making it on the facts rather than on the look of a showroom.

A walk-in shower keeps a defined shower area, usually with a low-profile tray or a level-access former in one part of the room, while the rest of the bathroom floor stays dry and is finished normally. A wet room removes that boundary: the whole floor is tanked and falls to the drain, so water can go anywhere and it does not matter. That single difference drives almost everything else.

Choose a wet room when level access matters most, when the room is small and a tray and screen would chop it up, when a wheelchair, shower chair or carer access is needed, or when you want the easiest possible cleaning, with no tray edges or enclosure tracks to trap dirt. A wet room also suits rooms where the floor level and drainage already favour it, for example a ground-floor room on concrete with a nearby soil stack, where the extra tanking cost is modest for the benefit.

Choose a walk-in shower when budget is the main constraint, when the rest of the bathroom needs to stay dry, for example where a wooden vanity unit or storage sits close to the shower, when the room is upstairs on timber and the cost of full tanking and floor strengthening is hard to justify, or when you may want to change the layout later, because a tray shower is far easier to alter than a fully tanked floor. Our walk-in shower cost guide prices the three walk-in scopes separately, and EA Mobility’s 2026 comparison puts a walk-in shower at £6,000 to £10,500 installed against £8,000 to £14,000 for an accessible wet room, a difference of typically £2,000 to £3,500 at the same finish level, which is a fair guide to the premium for going fully wet.

There are also practical differences that showroom visits do not reveal. A wet room floor is wet after every shower, so the whole room needs a floor finish that is safe when wet, and towels, toilet paper and anything stored at low level need to be kept out of the splash zone. A walk-in shower keeps the splash contained, which matters in a family bathroom. On the other hand, a wet room has no tray to step over and no enclosure door to maintain, which matters more as mobility changes. Neither is better in the abstract. The right choice is the one that fits the floor you have, the drainage you can achieve, and the people who will actually use the room.

Failure Points and Guarantees: What Goes Wrong, and What to Ask For

Wet rooms fail in predictable places, and knowing them lets you ask the questions that separate a careful fitter from a quick one.

The first failure point is the tanking junction, where the floor meets the wall, around pipes, and at the drain. Water finds the weakest joint, not the middle of a well-coated floor, so the joints, corners and penetrations matter more than the flat areas. Ask how joints are reinforced, whether the drain flange is bonded into the tanking rather than just tiled over, and whether the fitter will leave the tanking exposed for inspection or photographs before tiling.

The second failure point is the fall. A floor that looks level but does not fall consistently to the drain will leave puddles, and puddles lead to limescale, mould and a room that never feels dry. Ask how the fall is formed, what gradient is specified, and whether the drain is at the lowest point of the finished floor, not just the lowest point of the former before tiles go on.

The third failure point is drainage capacity and maintenance. A wet room drain handles more water, hair and soap than a basin waste, and a blocked or slow drain turns a wet room into a paddling pool. Ask for a drain with a removable trap that can be cleaned without lifting tiles, and ask how often it should be cleaned. A pump, where one is fitted, needs the same question, plus what happens in a power cut, because a pumped wet room without power does not drain.

The fourth failure point is ventilation and heating. A room that stays damp will grow mould on grout and sealant no matter how good the tanking is, so an extractor fan sized for the room, ideally with a humidistat or a run-on timer, and a heat source that dries the floor, usually underfloor heating, are part of the system, not luxuries. Check that the fan vents outside, not into a roof void, and that any electrical work is covered by the Part P requirements mentioned earlier.

On guarantees, ask for three things in writing: the tanking guarantee, including its length and whether it covers labour to lift and re-lay tiles if the tanking fails; the drain and pump guarantee, where relevant; and the overall workmanship guarantee. A one-year guarantee on a tanking system that should last the life of the room is a warning sign. So is a guarantee that covers materials only, or that excludes the waterproofing layer altogether. Keep the product names, the tanking photographs, and the guarantee together with the quote, because a future buyer, surveyor or insurer will ask for them, and a wet room with a documented tanking system is worth more than one without.

A well-built wet room should last for years with only routine cleaning and drain maintenance. A badly built one will announce itself within a year or two, usually as a stain on the ceiling below. Spending the time on the survey, the tanking specification and the guarantee is what keeps a wet room in the first category.

Frequently Asked Questions

How much does a wet room cost in the UK?
Typically £4,000 to £13,000 for a standard conversion. MyJobQuote puts the average at around £5,500 within a £4,000 to £7,000 range, Checkatrade gives £5,000 to £13,000 with an average of around £9,000, and accessible wet rooms run higher, at £8,000 to £14,000 or more.

How long does a wet room installation take?
Most standard conversions take 4 to 7 days, according to MyJobQuote. Upstairs timber floors, pumped drainage, layout changes and higher-specification finishes can extend that, and a full strip-out and rebuild will take longer than a straightforward replacement.

What is tanking, and why does it cost so much?
Tanking is the waterproof membrane system applied to the floor and up the walls, under the tiles, that makes the room watertight. It is the defining part of a wet room, and a specialist guide prices a membrane system at around £600 to £1,500, with floor-forming adding £400 to £1,200, because it has to be continuous, jointed correctly and guaranteed.

Can you have a wet room upstairs?
Yes, but it costs more and needs more care. Timber floors usually need strengthening, a pre-formed former keeps the build-up thin, and drainage may need a pump if there is not enough fall. Get the floor and drainage surveyed before accepting a price.

Is a wet room better than a walk-in shower?
It depends on the room and the user. A wet room gives full level access and easier cleaning, but costs typically £2,000 to £3,500 more than a comparable walk-in shower and leaves the whole floor wet after showering. A walk-in shower is cheaper, keeps the rest of the room dry, and is easier to alter later.

Do I need planning permission or Building Regulations approval for a wet room?
A wet room inside an existing home does not normally need planning permission, but Building Regulations apply to drainage, ventilation, electrics and structural floor work. Any electrical work in a bathroom must meet Part P requirements, and floor strengthening or drainage changes should be checked with the installer or building control where relevant.

What is the cheapest way to get a wet room?
Keep the toilet and basin where they are, choose gravity drainage over pumped drainage, use wall panels instead of full tiling, and keep the specification mid-range. The one place not to cut cost is tanking, because a failed floor costs around £1,200 just to replace, before any damage below is repaired.

Does a wet room add value to a house?
It can help, especially for accessibility and in a small bathroom where it makes the room feel larger, but it is not a guaranteed value add. A well-documented wet room with a tanking guarantee and photographs of the waterproofing work is far easier to sell than one with no paperwork, and a wet room in place of the only bath in a family home can put some buyers off, so think about who is likely to buy next.

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