The cost of a wet room depends mainly on the size of the room, whether it is upstairs on a timber floor or downstairs on concrete, how far the drain is from the waste, how much needs stripping out, the waterproofing, your choice of tiles or wall panels, and any accessibility features, electrics or underfloor heating. A walk-in shower with a tray usually costs less than a full wet room. Some adaptations for a disabled person may be zero-rated for VAT, and a council Disabled Facilities Grant may help eligible people with the cost.
Why we do not publish set prices
Two bathrooms that look the same from the doorway can need very different work. One might have a solid concrete floor with the soil stack right next to the shower; the other might have joists running the wrong way, an old cast-iron waste and rotten boards under the bath. A fixed price list would either overcharge the first or leave the second with nasty surprises. That is why we visit, measure and check the floor and drainage before giving a written quote. This guide explains what we are looking at, so that the quote makes sense when you get it.
What are the main cost factors?
| Factor | What it means | Effect on cost |
|---|---|---|
| Room size | The floor area to form and tank, and the wall area to waterproof and tile | Larger rooms need more materials and labour, but the floor and drain work is a fixed part of every job |
| Upstairs or downstairs | Where the room is and what is underneath it | Upstairs rooms need care to protect ceilings below; access and carrying materials also take time |
| Floor type | Timber joists or solid concrete | Timber usually needs a pre-formed shower former between joists and new boarding; concrete may need channelling for the waste |
| Drainage | Distance and route from the drain to the soil stack, and the fall available | A short, direct run is simpler; a long run, a moved stack or a pump adds cost |
| Tanking | The waterproof system on floor and walls | A full wet room is tanked throughout; a walk-in shower only needs the shower area waterproofed |
| Tiles or wall panels | The finish on walls and floor | Panels are often quicker to fit with fewer grout lines; tile choice, size and pattern affect labour and material costs |
| Flooring | Slip-resistant tiles or safety vinyl | Both are common; the cost depends on the product and the shape of the room |
| Accessibility features | Seat, grab rails, thermostatic shower, lever taps, raised toilet, wider door | Each item adds parts and fitting time; door widening involves building work |
| Electrics and heating | Shower circuit, lighting, extractor, underfloor heating | Carried out by a qualified electrician; electric showers and underfloor heating need suitable circuits |
| Strip-out | Removing the old bath, suite, tiles and flooring | More layers, old tiles on tiles or heavy cast-iron baths take longer to remove and dispose of |
| Making good | Repairs to ceilings, walls, floors and decoration outside the room | Often needed after a leak or where pipes have been moved |
How do size and layout affect cost?
People often expect a small wet room to cost much less than a large one, but that is not always the case. Every wet room needs a drain, a properly formed floor and waterproofing, and those costs do not shrink much with the room. What does scale with size is the amount of tanking, tiles or panels and flooring, plus the labour to fit them. Awkward shapes, sloping ceilings and boxed-in pipes add time because more cutting and detailing is needed. If you have a compact space, our page on small wet rooms explains how layout choices affect the result.
Upstairs or downstairs, timber or concrete?
The floor is one of the biggest variables. On a timber first floor, the usual approach is to lift the boards, fit a pre-formed shower former between the joists to give the right fall, and re-board with a suitable water-resistant board before tanking. The direction and depth of the joists decide where the drain can go; sometimes joists need trimming or extra support, which adds work.
On a solid concrete floor, there is no space between joists, so the drain and waste may need a channel cut into the slab, or the floor built up slightly to create the fall. Ground-floor rooms in rear extensions on Victorian terraces, and many bungalows, fall into this category. Neither option is automatically cheaper; it depends on the route to the drain.
Drainage and waste routes
Water has to leave the wet room by gravity, with enough fall both across the floor and along the waste pipe. If the soil stack is close and the waste can run straight to it, the job is simpler. If the drain has to cross joists, run a long way or connect to a stack on the other side of the house, more work is needed. Occasionally, where gravity drainage is not possible, a shower pump is the answer; that adds the cost of the pump and its electrical supply, and an ongoing part to maintain.
Tanking and waterproofing
Tanking is what makes a wet room a wet room. In a full wet room the whole floor and the walls of the shower area (often the whole room to a set height) are waterproofed with a membrane or liquid system before any finish goes on. Corners, pipe entries and the drain connection all need special detailing. It is not the place to cut corners, because failed tanking is the most common reason a wet room ends up needing repairs. A walk-in shower with a tray only needs the shower walls waterproofed, which is one reason it often costs less.
Tiles or wall panels?
Tiles give the widest choice of looks, but cost depends on the tile, the size and how much cutting is involved. Large-format tiles need a very flat substrate; small mosaics take longer to lay. Waterproof wall panels are quicker to fit, have few or no grout lines and are easy to clean, which many landlords and busy households prefer. Floors in wet rooms are usually slip-rated tiles or safety vinyl. We can talk through options at the visit.
Accessibility features
Features such as a fold-down shower seat, grab and support rails, a thermostatic shower, lever taps, a comfort-height toilet, a basin a wheelchair can get under and a wider or outward-opening door all add to the cost. Rails and seats need solid fixings, so hollow walls may need backing. Door widening is building work. Our disabled wet rooms page explains what each feature does, so you can decide which matter most.
Electrics, ventilation and underfloor heating
Most wet rooms involve some electrical work: an electric shower circuit, new lighting, an extractor fan, or underfloor heating. Bathroom electrics are notifiable under Part P of the Building Regulations and are carried out by a qualified electrician. Underfloor heating is optional but helps floors dry quickly and keeps the room comfortable, which is particularly useful for older people. Good extraction is essential in any wet room to control condensation and mould.
Strip-out and making good
Removing an old bathroom can be quick or slow. Cast-iron baths, several layers of old tiles, tiles fixed to tiles, or old plaster that comes off with them all add time and disposal costs. After any leak, or where we move pipes, ceilings and walls outside the bathroom may need repair and redecoration. Your quote should say clearly what making good is included.
Is a wet room more expensive than a walk-in shower?
Usually, yes. A walk-in shower uses a tray with a built-in fall, so there is less floor work and only the shower area needs waterproofing. A full wet room needs the whole floor formed and tanked. A bath to shower conversion with a low-profile tray is often the simplest of all. If level access across the whole room is not essential, a walk-in shower can be a sensible way to control cost.
VAT relief on disabled adaptations
Some building work and adaptations for a disabled person’s own use, such as installing a level-access shower or wet room, can be zero-rated for VAT. The person must meet the definition of disabled used by HMRC (a long-term illness or a physical or mental impairment that substantially affects their ability to carry out everyday activities), the work must be for their personal use, and an eligibility declaration is normally signed. Not every item qualifies, and the rules can be detailed, so check eligibility against HMRC guidance before the work starts.
The Disabled Facilities Grant
A Disabled Facilities Grant (DFG) is a council grant that may help eligible disabled people pay for adaptations such as level-access showers. In England, the mandatory DFG has a government maximum of £30,000 per application. Adults are means-tested; applications for disabled children are not. An occupational therapist usually assesses what is needed, tenants need landlord consent, and councils may offer extra discretionary help. Only the council can decide eligibility and timescales. Our DFG wet rooms page explains the process step by step.
How to get an accurate quote
The best way to understand the cost of your wet room is a home visit. We ask who the room is for and what they need, measure the room, check the floor, drainage and walls, and then give you a written quote and plan. Before we visit, it helps to know what features you want, whether an OT or council is involved, and what finish you like. Our wet room buyer’s guide has a list of questions to think about. We carry out wet room installation across Liverpool and the wider area, including Southport and Birkenhead, and you can find out more about our Merseyside wet room service on the main page.
Want a written quote?
Tell us about the room and who will use it, and we will call you back and arrange a visit. Call 07777 659786 or leave your details on the form.
Frequently asked questions
Why can’t you give me a wet room price over the phone?
Because most of the cost depends on things we can only see on a visit: whether the floor is timber or concrete, which way the joists run, how far the drain is from the soil stack and what is under the old bath. A phone price would be a guess. A visit lets us give you a written quote you can rely on.
Is a wet room cheaper than a new bathroom?
Not necessarily. A wet room needs floor forming, a drain and full tanking, which a standard bathroom with a bath does not. On the other hand, you may not need a bath, enclosure or tray. The comparison depends on the room and the finishes you choose.
Does a wet room cost more upstairs?
Often it does, because a timber floor usually needs a shower former between the joists, new boarding and extra care to protect the ceiling below. But a concrete floor downstairs can need channelling for the waste, which also takes time. The drain route matters as much as the floor level.
Can I get VAT relief on a wet room?
Some adaptations for a disabled person’s own use, such as a level-access shower, can be zero-rated for VAT if eligibility rules are met. The person usually signs a declaration confirming eligibility. Check the HMRC guidance or ask before work starts, because not every item may qualify.
What is the maximum Disabled Facilities Grant?
In England, the mandatory Disabled Facilities Grant has a government maximum of £30,000 per application. Your council decides whether you are eligible and how much you receive, based on an assessment and, for adults, a means test. Some councils also offer discretionary top-up help.
Do tiles or wall panels cost less?
It depends on the products. Wall panels are often quicker to fit and have fewer grout lines, which can reduce labour. Tiles offer more choice and can be very cost-effective, but complex patterns, large formats or mosaics take more time. We can price both options for comparison.
Is underfloor heating worth adding to a wet room?
Many people find it worthwhile. It helps the floor dry faster after a shower, makes the room warmer underfoot and can reduce condensation. It adds to the cost and needs a suitable electrical supply, fitted by a qualified electrician, so it is worth deciding before the floor is laid.