Wetroom Installation Cost in London: 2026 Price Guide
Updated 12 June 2026|8 min read
A wetroom installation in London costs between £8,000 and £20,000 or more in 2026, depending on size and specification. A compact ensuite wetroom typically lands at £8,000–£12,000, while a larger family wetroom with high-end tiling and brassware reaches £15,000–£20,000+. The cost is driven by the work hidden behind the tiles: full tanking, forming the falls to the drain, and getting the drainage right. Done well, a wetroom lasts decades; done badly, it leaks into the room below. This guide breaks down the price, the process and why waterproofing is non-negotiable.
How much does a wetroom cost to install in London?
A wetroom in London costs £8,000–£20,000+ in 2026, and the spread is wider than for a standard bathroom because the waterproofing and drainage work is more involved and the finishes tend to be higher.
The size of the room is the first driver. A small ensuite wetroom of around 2–3 square metres can be fully tanked, drained, tiled and fitted for £8,000–£12,000. A standard family wetroom of 4–6 square metres runs £12,000–£16,000. A large or high-specification wetroom, with underfloor heating, large-format porcelain or natural stone, a concealed cistern and quality brassware, reaches £16,000–£20,000 or more.
The table below shows the typical ranges we see across London projects. Treat very low quotes with caution: in a wetroom, the corners that get cut are almost always the waterproofing ones, and those are precisely the corners you cannot afford to cut.
Wetroom type / size
Typical London cost (2026)
Small ensuite (2–3 m²)
£8,000 – £12,000
Standard family wetroom (4–6 m²)
£12,000 – £16,000
Large / high-spec wetroom (6 m²+)
£16,000 – £20,000+
Tanking / waterproofing element only
£1,200 – £3,000
What does a wetroom installation actually involve?
A wetroom is a fully waterproofed room with a level or near-level shower area that drains directly to the floor, with no raised tray and often no enclosure. Achieving that reliably takes several distinct stages, and the price reflects all of them, not just the tiling you see at the end.
First the room is stripped back and the floor and walls are prepared. On a timber floor this usually means a recessed area to house the drain and create the falls; on a concrete floor the gradient is formed in the screed. Next comes the gradient former, a pre-formed sloped tray or a hand-built screed fall, which directs water to the drain or linear channel. The whole wet zone, and usually the entire floor and lower walls, is then tanked with a waterproof membrane and tape at every junction. Only once the tanking is complete and tested does tiling begin, followed by grouting, sealing and fitting the brassware, screen and accessories.
Drainage is the part most people underestimate. The drain must connect to the existing waste with adequate fall, which on a converted bathroom can mean building up the floor or routing pipework through joists. A linear channel drain along one wall is popular and looks clean, but costs more than a centre point drain. Every one of these stages is a place where quality shows, and where a leak begins if it is rushed.
Why tanking and waterproofing make or break a wetroom
The single most important thing about a wetroom is that the waterproofing is continuous and correct, because in a wetroom there is no tray, no upstand and no enclosure to contain water; the room itself is the shower. If the membrane fails, water goes straight into the floor structure.
Tanking means applying a waterproof membrane, liquid or sheet, across the floor and lower walls, with reinforcing tape bedded into every internal corner, around the drain, and across the floor-to-wall junctions where movement and water collect. Tiles and grout are not waterproof; they are a wearing surface over the membrane. A wetroom that relies on grout alone to keep water out will leak, usually within a year or two, and usually into the ceiling below.
We see the consequences of poor tanking constantly through our leak repair work: stained ceilings beneath bathrooms, damp walls on the floor below, and rot in joist ends around drains. Putting that right means taking the finished wetroom apart, which is far more expensive than tanking it properly the first time. This is the strongest argument for not buying on price alone. The tanking is invisible in the finished room, which is exactly why it is the corner most often cut, and the one that costs the most when it fails.
Small ensuite versus large family wetroom
Size changes a wetroom budget in ways that are not purely proportional, so it helps to think about the two ends of the range separately.
A small ensuite wetroom of 2–3 square metres is the most cost-effective way into wetroom living. The tanking area is small, the tile quantity is low, and a single point drain usually suffices. At £8,000–£12,000 it delivers a hotel-style ensuite in a footprint too small for a comfortable enclosed shower. Because the room is small, the proportion of the budget spent on waterproofing and drainage is relatively high, which is a good thing: it is the part that matters.
A large family wetroom of 4–6 square metres or more spreads the fixed costs over a bigger room but adds tiling area, often a longer drainage run, frequently a linear channel, and usually higher-specification finishes. At £12,000–£20,000+, the extra is going on tiles, brassware, underfloor heating and the larger tanked area rather than on fundamentally different work.
In both cases the non-negotiable spend is the same: proper falls, continuous tanking and correct drainage. Everything above that is finish, and finish is where you can flex the budget up or down.
How long does a wetroom take to install?
A wetroom typically takes two to three weeks to install in London, and the programme is paced by the waterproofing as much as by the trades.
A small ensuite wetroom can be completed in around 8–12 working days: strip-out and first-fix plumbing, forming the falls and drain, tanking and allowing it to cure, tiling, grouting and sealing, then second-fix and fitting. A larger wetroom, or one needing structural floor work to accommodate the drain, runs 12–18 working days.
The step that cannot be rushed is the tanking. Liquid membranes need curing time before tiling can start, and skipping that to save a day is exactly how failures begin. If underfloor heating is included, that adds time for the screed or matting and the commissioning. We programme the cure and test stages deliberately, because a wetroom built a few days quicker but tested improperly is a leak waiting to happen.
What drives the price up or down?
Two wetrooms of the same size can differ by thousands of pounds, and knowing the levers lets you control the budget without compromising the parts that matter.
The biggest upward drivers are the finishes: large-format porcelain and natural stone cost more to buy and far more to fit than standard tiles, because they demand a flatter substrate and slower, more precise setting-out. Concealed cisterns and wall-hung sanitaryware, quality brassware, a linear channel drain, underfloor heating and a frameless glass screen all add up. Structural work, such as building up a floor or rerouting waste to achieve fall, adds cost on conversions.
The parts you should never economise on are the tanking, the falls and the drainage; these are the structure of a successful wetroom. The parts you can flex are the tile choice, the brassware brand and the optional extras like underfloor heating. The labour to fit a £30 tile and a £90 tile is almost identical, so the tile you choose is one of the most powerful budget levers you have, while the waterproofing beneath it should be specified to a fixed, high standard regardless of budget. VAT applies to most wetroom work and should be allowed for on top of the figures above.
Frequently Asked Questions
How much does a wetroom cost to install in London in 2026?
A wetroom in London costs £8,000–£20,000+ in 2026. A small ensuite wetroom of 2–3 square metres runs £8,000–£12,000, a standard family wetroom £12,000–£16,000, and a large or high-specification wetroom £16,000–£20,000 or more. The waterproofing and drainage work drives much of the cost, with finishes accounting for the rest. VAT applies to most of this work on top.
Why is a wetroom more expensive than a standard bathroom?
A wetroom costs more because the whole room must be waterproofed, the floor must be formed with falls to a drain, and the drainage often needs reworking to achieve adequate fall. There is no tray or enclosure to contain water, so the tanking has to be continuous and correct. That hidden work, full tanking, gradient forming and drainage, is more involved than fitting a standard shower tray, which is why a wetroom typically costs £2,000–£5,000 more than an equivalent bathroom.
Do wetrooms leak, and what causes it?
Wetrooms leak when the waterproofing is done poorly. Tiles and grout are not waterproof, so a wetroom relies on a continuous tanking membrane beneath them, with reinforcing tape at every junction and around the drain. If the tanking is skipped, incomplete, or not tested, water passes into the floor structure and usually appears as a stained ceiling below within a year or two. Correct tanking, costing around £1,200–£3,000 as part of the job, is what prevents this.
How small can a wetroom be?
A wetroom can work in as little as 2 square metres, which is why they suit ensuites and awkward spaces too small for an enclosed shower. A compact ensuite wetroom of 2–3 square metres typically costs £8,000–£12,000 fully tanked, tiled and fitted. The small footprint actually makes the waterproofing element a higher proportion of the budget, which is no bad thing, since that is the part that matters most.
How long does it take to install a wetroom?
Most wetrooms take two to three weeks. A small ensuite wetroom is usually 8–12 working days; a larger one, or one needing floor build-up to route the drain, runs 12–18 working days. The tanking membrane needs curing time before tiling, and that stage cannot be rushed without risking a leak, so a properly built wetroom is paced by the waterproofing as much as by the trades.
