Wet Room Costs UK — What to Charge for Wet Room Installation in 2026

Wet Room Costs at a Glance (2026)

All-in supply-and-fit costs to the customer — including waterproofing, floor former, tiling, shower valve, and a glass screen — fall into three broad tiers:

London and the South East typically add 25–40% to these figures. The lower end of each tier assumes a straightforward solid concrete floor with no structural remediation needed. Suspended timber floors — common in pre-1970s housing — add £500–£1,500 for floor preparation before any tiling work can begin.

Cost Breakdown by Trade and Component

Unlike a standard bathroom swap, a wet room involves distinct preparatory stages that each carry their own labour and material cost. Missing any of them — or underpricing them — is how margins disappear.

Waterproofing System (Tanking)

Waterproofing is the most critical element of any wet room and the most commonly skimped. There are three main systems in use:

• Brush-applied liquid membrane (Aqua-X, BAL Waterproof Plus): lowest cost, quickest to apply. Materials £150–£300 for a typical bathroom-sized wet room. Labour to apply: £150–£300. Requires minimum two coats with 90-minute dry time between. Best for solid substrates.
• Sheet membrane (Schluter Kerdi, Wedi Subliner Dry): bonded sheet system applied over cement board or block. Materials £250–£500. Labour £200–£350. More robust at pipe penetrations and corners.
• Full Wedi board system: the premium option. Fully waterproof XPS foam board with glass-fibre reinforcement replaces stud walls entirely. No additional tanking required on the boards themselves — only at joints. Materials £400–£900 depending on room size. Labour £350–£600. Strongest long-term performance and fastest to tile over.

Whatever system you use, all pipe penetrations and the drain connection must be sealed with the manufacturer's collar or sealant. This is non-negotiable — it is the number one location for water ingress in failed wet rooms.

Floor Former and Wet Room Tray

A wet room needs a pre-formed gradient in the floor so water drains to the outlet rather than pooling. On a concrete slab this can be achieved with a sand-and-cement screeded fall (allow £200–£400 for materials and labour for a typical 4–6m² wet area). The more reliable option — and the one to specify on all jobs where the floor allows — is a pre-formed wet room floor former: a XPS foam tray with a built-in 1.5% gradient and integrated waterproof surface.

Floor formers (Wedi Fundo, Schluter Kerdi-Shower, Impey Aqua-Dec) cost £200–£600 supply depending on size and brand. Installation time is typically half a day and is included within the tiling day-count. The drain connection must use the manufacturer's matching drain body to maintain the waterproof warranty.

Linear Drain

A linear drain (wall-to-wall slot drain) is the current client expectation on mid-range and luxury wet rooms. It allows large-format tiles to be laid with a single-direction fall rather than a four-way fall from a centre point, which is both easier to tile and better-looking. Supply cost for a quality stainless steel linear drain (Geberit CleanLine, Impey Aqua-Dec Linear, Mira Flight):

• Entry-level channel drain: £80–£150
• Mid-range linear drain (Impey, Mira): £150–£300
• Premium designer drain (Geberit, Dallmer): £300–£500+

Fitting the drain is included in the tiling phase. Wall-mounted drains require additional plumbing to connect the outlet — allow an extra hour of plumber time.

Floor Tiling

Anti-slip floor tiles are mandatory in a wet room — specify minimum R10 slip rating (R11 recommended for elderly or disabled users). This rules out many standard polished porcelain tiles. The R-rating is on the tile manufacturer's data sheet — always check before specifying.

Large-format tiles on a wet room floor cost more to lay because achieving the correct fall while keeping tiles flat requires more skill and time. Add 20–30% to your labour rate for 600x600 or larger floor tiles in a wet room compared to a standard bathroom floor.

Wall Tiling

Wall tiling in a wet room is typically full-height on at least three sides of the shower zone, with the remainder of the room tiled to whatever height the client specifies. Supply-and-lay rates:

Shower Valve and Controls

All wet room showers should use a thermostatic valve — it is the industry standard and the sensible thing to specify for safety. Supply cost for a concealed thermostatic valve:

• Budget thermostatic (Aqualisa, Mira): £150–£250
• Mid-range concealed thermostatic (Grohe, Hansgrohe): £250–£450
• Premium (Vado, Crosswater, Lusso Stone): £400–£600+

First-fix plumbing for a concealed valve — running hot and cold to the valve position in the wall — takes two to four hours. Second-fix fitting and commissioning takes one to two hours. Budget £150–£300 for fitting the valve as part of the plumbing package.

Glass Screen or Enclosure

Most wet rooms use a partial glass screen or frameless panel rather than a full enclosure — the open design is the whole point. Supply-and-fit costs:

• Fixed frameless glass panel (8mm, single panel): £300–£600 supply and fit
• Two-panel walk-in (fixed + return): £500–£900 supply and fit
• Full frameless enclosure with door: £800–£1,500 supply and fit
• Bespoke structural glass (floor to ceiling): £1,500–£4,000+

Plumbing First and Second Fix

Plumbing labour across the whole wet room project — strip-out, first fix, second fix — typically runs two to three days for a bathroom fitter working solo, or one and a half to two days if a dedicated plumber is doing only the plumbing while a tiler handles the tiling phase concurrently. Day rates for plumbers and bathroom fitters in 2026: £220–£350 per day depending on region. Budget £400–£800 for all plumbing labour on a standard wet room conversion.

Electrical Works (NICEIC Certified)

Electrical work in a bathroom is a notifiable Part P activity. Any electrician carrying out this work must be registered with a competent person scheme (NICEIC, NAPIT, ELECSA) or the work must be notified to and inspected by building control. For a wet room the typical electrical scope includes:

• Recessed IP65 downlights (zone 1/2 rated): allow £80–£150 per light supplied and fitted
• Extract fan (15 litres/second minimum at shower position, per Building Regs Part F): £150–£300 supply and fit
• Electric underfloor heating thermostat: £150–£300 supply and fit
• Heated towel rail (electric): £200–£400 supply and fit for a mid-range towel rail

Electrician day rates: £200–£350. A standard wet room needs half a day to a full day of electrician time. Include the Electrical Installation Certificate (EIC) in your quote — this is a legal requirement for notifiable work and must be issued to the client on completion.

Underfloor Heating

Electric underfloor heating mats are the standard choice in wet rooms — they sit directly under the tile and connect to a thermostat on the wall. Water (hydronic) UFH is only viable if there is already a system in the house and the floor height allows.

The electric mat is laid directly over the floor former or substrate before tiling. The sensor probe must be positioned between cables in a conduit so it can be replaced without lifting tiles. The thermostat requires its own fused spur — this is electrician work and must be certificated.

Structural Considerations — Survey Before You Quote

The floor type is the single biggest variable in wet room pricing and the one most likely to catch out bathroom fitters who quote from photos or descriptions rather than site surveys.

Solid Concrete Floors

A solid concrete floor (ground floor slab or concrete upper floor) is the easiest substrate for a wet room. Once the old floor finish is removed, you can apply tanking directly to the slab, bed a floor former, and tile. The main risk is an uneven slab — check with a straight edge, allow for levelling compound (£100–£200 for materials) if needed.

Suspended Timber Floors

Suspended timber floors — the norm in Victorian, Edwardian, and pre-1970s housing — require significant preparation before a wet room can be installed. Tiles crack on flexible floors. The standard approach is:

1. Remove existing floor finish and check joist condition
2. Fix 18mm WBP (weather and boil proof) ply over the existing floorboards — screwed at 200mm centres
3. Apply cement board (HardieBacker, Jackoboard) over the ply — this eliminates flex and provides a stable, non-organic substrate
4. Apply waterproofing system over the cement board

This floor build-up adds 30–50mm to the finished floor height — which may create a step at the bathroom door. Factor in a threshold strip or discuss with the client at survey stage. If there is no headroom for additional floor depth, a Wedi Fundo Primo floor former (only 25mm deep at its thinnest) or a Schluter Kerdi-Shower-ST tray may be the answer.

The bounce test: stand on the floor and apply your body weight through your heel at different points. If the floor moves — even slightly — the tiles will eventually crack. Do not tile a floor that bounces. Strengthening a bouncy timber floor typically costs £300–£600 in additional materials and half a day of labour.

Total floor preparation cost for a suspended timber floor: £500–£1,500 depending on condition and depth of remediation needed. Always quote this as a separate line item — it is not optional.

Accessibility and Disabled Wet Rooms

Converting a bathroom to a level-access wet room for an elderly or disabled person is a growing market. The spec differs from a standard wet room — it is designed for safe, independent use by someone with limited mobility — and it comes with a potential funding mechanism that can help clients afford the work.

Disabled Facilities Grant (DFG)

The Disabled Facilities Grant is a means-tested grant from the client's local council. In England the maximum grant is £30,000. Wales, Scotland, and Northern Ireland have their own equivalents with different amounts and eligibility rules. The client applies via their local council — they do not apply through you — but knowing about it means you can flag it at the survey stage, which positions you as the knowledgeable choice.

An occupational therapist (OT) is usually involved in DFG-funded works. The OT produces a report specifying the adaptations needed. You may be asked to quote against an OT specification, which tends to be prescriptive on grab rail positions, shower seat type, and floor slip rating. Build in time for coordination — DFG jobs typically take longer to start due to the approval process.

Accessibility Spec Elements and Costs

• Grab rails: stainless steel or nylon-coated grab rails, typically 300mm and 600mm lengths — £40–£120 each supply and fit. Must be fixed into solid blocking or studs — not plasterboard alone.
• Fold-down shower seat: wall-mounted folding shower seat (Pressalit, Handicare, AKW): £150–£400 supply and fit. Must be load-rated and fixed to solid backing.
• Contrasting tile colours: specifying a contrasting colour between walls and floor helps partially sighted users identify the edge — add this to your spec notes at no extra cost.
• Anti-scald thermostatic valve: thermostatic valves with a maximum temperature stop at 38°C are standard on all accessibility wet rooms. Most mid-range thermostatic valves include this — check the spec sheet.
• Level access threshold: the transition from the hallway or bedroom into the wet room must be flush — no lip, no threshold strip. Factor this into your floor build-up planning.

Accessibility wet room total costs run £5,000–£12,000 for a standard bathroom conversion. DFG-funded jobs are paid by the council directly on receipt of completion certificate — confirm the payment process with the client and council before starting work.

Building Regulations and Planning

Wet rooms do not normally require planning permission — they are internal works. Building regulations apply to two specific elements:

• Part P — Electrical: All electrical work in a bathroom is notifiable unless carried out by a competent person scheme member. This means the electrician must be registered with NICEIC, NAPIT, ELECSA, or a similar scheme. The electrician issues an Electrical Installation Certificate (EIC) on completion. Keep a copy — the client will need it when they sell the property.
• Part H — Drainage: New drainage connections must comply with Part H of the Building Regulations. In practice, most wet room conversions use existing drainage positions — but if you are moving the drain outlet or adding a new connection to the soil stack, this is a notifiable change. Check with the local authority if in doubt.
• Part F — Ventilation: Building Regulations require a minimum extract rate of 15 litres per second at the shower position. This is the minimum — in a wet room with no opening windows, a higher-rated fan (30 l/s) is better practice. The fan must have a 15-minute overrun timer.

Listed buildings are a different matter — any alterations to the fabric of a listed building require listed building consent regardless of whether they are internal. Always check before starting on a listed property.

Labour Days and How to Structure Your Quote

A typical wet room conversion takes 5–10 working days for a two-person team (plumber or bathroom fitter plus a tiler working in sequence). Here is a realistic day-by-day breakdown:

Always quote wet rooms as a fixed price, not a day rate. Clients are much more comfortable with a fixed-price quote for a defined scope — it gives them certainty and gives you the opportunity to build in proper contingency. If the floor turns out to need remediation that was not visible at survey, this is a change to scope — document it, get written sign-off, and raise a variation. A well-written quote that defines the scope clearly protects you; a day rate quote does not.

Structure your quote with clearly separate line items: strip-out, floor preparation, waterproofing system, floor former and drain, floor tiling, wall tiling, plumbing first fix, plumbing second fix, electrics, shower valve, glass screen, sanitaryware. Clients who can see exactly what is included are easier to upsell and less likely to dispute the final invoice.

Waterproofing — Getting It Right

The most common cause of wet room failure is inadequate waterproofing. Water finds every gap — at pipe penetrations, at the drain collar, at internal corners, and at any point where two different materials meet. A wet room that fails within two to three years costs you the job in call-backs and reputation. Getting the waterproofing right costs £300–£900 in materials and half a day of extra labour. It is not worth skimping on.

Minimum Specification (Any System)

• Minimum two coats of tanking slurry or liquid membrane on the entire floor area and at least 300mm up all walls — more if the shower head is positioned close to a wall
• Fabric tape or mesh reinforcement at all internal corners and wall-floor junctions — cut from the roll, pressed in while the first coat is wet, then overcoated
• Manufacturer's collar or sealant at every pipe penetration through the floor and walls
• Manufacturer's drain seal at the connection between the drain body and the waterproofing layer — this joint sees the most water
• Full cure time before tiling — 24 hours minimum for most liquid membranes, check the data sheet

System Comparison

Aqua-X (brush-applied liquid membrane): fastest to apply, lowest material cost. Best on solid substrates. Requires scrupulous attention to corners and penetrations. Not suitable over timber without cement board underneath.

Wedi Subliner Dry (sheet membrane): bonded with adhesive to cement board or block. Stronger at corners and penetrations than brush-applied systems because the sheet overlaps rather than relying on a brush coat in a tight angle. Slightly more time to apply.

Full Wedi board system: the benchmark. Wedi boards are 100% waterproof XPS foam with a glass-fibre-reinforced surface — you waterproof the joints with Wedi sealant and Wedi jointing tape rather than tanking the entire surface. Fastest to tile over once joints are done. Best for new stud walls and reboarded partitions. Carries a Wedi system warranty if you use their components throughout. The premium choice — and worth specifying on luxury jobs as a selling point.

Upsells Worth Offering

Wet room clients who are spending £6,000–£10,000 on a bathroom are often open to extras if they are presented clearly at the quote stage rather than as afterthoughts once work has started. Build these into your standard quote as optional add-ons with pricing:

Recessed niches are the highest-conversion upsell on a wet room — clients almost always want somewhere to put shower products and a built-in niche looks infinitely better than a wire rack. Each niche takes two to three hours to form and tile and adds a meaningful amount to the invoice with minimal material cost. If the wall is Wedi board, forming the niche is even quicker — the foam core can be cut and removed cleanly.

Steam showers require a sealed enclosure to work — they cannot be installed in an open wet room design. If a client asks about steam, this is an opportunity to discuss a glass partition upgrade that closes the shower zone.