Wet Room Installation Cost: A Realistic UK Breakdown for 2026

I get asked the cost question more for wet rooms than for any other type of bathroom installation. The answer is more variable than for a standard bathroom because wet rooms have more variables — floor structure, drainage type, tanking complexity, tile choice, room size. This guide gives you realistic ranges and explains what drives the price.

Calacatta marble wet room, Beckenham. Premium natural stone, full-height wall tiling, graded floor to a linear drain. The investment in this kind of installation is significantly higher than a standard porcelain wet room, but the result has a different quality entirely. Wet room service

What you are paying for

A wet room is not a bathroom with the shower tray removed. The structural and waterproofing requirements are different, which is why the cost is different.

A complete wet room installation includes:

• Substrate assessment and preparation. The floor must be capable of carrying the gradient and the tile load. Existing flooring (carpet, vinyl, old tiles) is removed. Any structural issues are addressed.

• Floor grading. The floor needs to slope toward the drain. On a concrete subfloor, this is achieved by laying a graded screed. On a timber subfloor, a pre-formed shower former (a rigid foam or fibreglass tray with a built-in gradient) is installed.

• Tanking membrane. Liquid-applied or sheet membrane covering the entire floor and the walls of the wet area to a minimum height of 1800mm (preferably to ceiling). All corners and junctions reinforced with fleece tape. This is the single most critical part of the installation.

• Drainage. Linear drain (running along one wall) or central drain. Linear is more expensive but allows the floor to slope in one direction only, which simplifies the tile layout.

• Tile installation. Floor tiled to follow the gradient. Walls tiled to full height where appropriate. Movement joints at all changes of plane.

• Grout and silicone. Grouting throughout. Silicone at all movement joints (floor-to-wall, wall corners, around fixtures). Epoxy grout recommended for the wet zone to resist staining and microbial growth.

• Final inspection and snagging. Testing the drainage, checking all tiles are sound, verifying the silicone is properly cured before handover.

Realistic price ranges for South East London in 2026

These figures assume installation by a qualified specialist with proper tanking and appropriate materials. They are not representative of cheap quotes that omit critical steps.

Compact wet room (3 square metres)

Total cost: £4,500 to £6,500

Breakdown approximation:

• Labour: £2,500 to £3,500 (4-5 days work)
• Tanking and materials: £400 to £600
• Drainage and former: £300 to £600
• Tiles (mid-range porcelain): £600 to £1,000
• Grout, silicone, sundries: £200 to £400
• Skip and disposal: £200 to £400

Typical scope: Small en-suite or guest bathroom converted to a fully tiled wet room with a corner or linear drain. Standard porcelain tiles. Existing room layout maintained.

Standard wet room (4-5 square metres)

Total cost: £6,500 to £9,500

Breakdown approximation:

• Labour: £3,500 to £5,000 (6-7 days work)
• Tanking and materials: £500 to £800
• Drainage and former: £400 to £800
• Tiles (mid to premium porcelain): £900 to £1,500
• Grout, silicone, sundries: £300 to £500
• Skip and disposal: £300 to £500

Typical scope: Family bathroom converted to a wet room with a separate dry zone for the toilet and basin. Linear drain along one wall. Tile to ceiling height in wet zone. Mid-tone porcelain.

Premium wet room (5-7 square metres)

Total cost: £9,500 to £15,000

Breakdown approximation:

• Labour: £5,000 to £7,500 (8-10 days work)
• Tanking and materials: £600 to £1,000
• Drainage and former: £800 to £1,500
• Tiles (premium porcelain or natural stone): £1,500 to £3,500
• Grout, silicone, sundries: £400 to £700
• Skip and disposal: £400 to £600

Typical scope: Larger family bathroom or master en-suite. Linear drain. Full ceiling height tiling. Stone effect porcelain or genuine natural stone. Possible niche, bench, or decorative pattern work.

Luxury wet room (7+ square metres or premium materials)

Total cost: £15,000 to £25,000+

Typical scope: Large master bathroom with full natural stone (marble, limestone, or travertine), bespoke drainage, decorative pattern work, integrated lighting, custom fixtures. Often part of a wider renovation.

What pushes the cost up

Floor structure

Concrete subfloors are simpler and cheaper to grade. Timber subfloors require pre-formed shower formers and additional structural assessment, which adds £500-£1,000 to the project.

Removing existing bathroom

Stripping out an existing bathroom (suite, tiles, fittings) adds 1-2 days of labour and disposal cost. Budget £400-£800 for full strip-out.

Drainage relocation

If the new wet room drainage cannot use the existing waste position, the plumbing needs reconfiguration. This may require lifting flooring, working under the floor, or running new pipes. Significant variable: anywhere from £300 to £2,000 depending on access and complexity.

Premium tile choice

Porcelain wet rooms cost meaningfully less than natural stone. Marble adds £500-£2,000 in tile cost over equivalent porcelain, plus 10-20% more in labour because of the careful handling, pre-sealing, and adhesive specification.

Larger room size

Each additional square metre adds approximately £500-£900 to the total cost (labour and materials combined).

Decorative features

Niches, tiled benches, feature walls in different tile, mosaic accents — each adds labour and material cost. A typical niche adds £200-£400. A tiled bench adds £400-£800.

What cheap quotes typically omit

If you receive a quote that is significantly below the ranges above, ask the tiler what is and is not included. Common omissions:

• Tanking. The most critical step, the most invisible step, the easiest to skip. A wet room without tanking is a future water damage claim.

• Adequate floor grading. Some installations use minimal gradient that almost works in dry conditions but pools water in real use.

• Linear drain replaced with central drain. Saves cost on the drain itself but creates more complex tile layouts and more cuts.

• Wall tiling stopping at 1800mm. Steam from a wet room rises to ceiling height. Stopping the tiles at 1800mm means moisture damage to the wall above within 12 months.

• Substrate preparation skipped. Old adhesive left on, uneven surfaces unaddressed, hollow plaster not replaced. The wet room looks fine on day one and starts failing within months.

• Cheap adhesive grade. Standard C1 instead of waterproof-rated C2 adhesive. The bond is weaker and the failure point is the wet area where it matters most.

The difference between a £4,000 wet room and a £7,000 wet room is rarely the visible result on day one. It is the invisible work that determines whether the room lasts 5 years or 25 years.

Is a wet room worth the cost?

For most homes, yes. A well-installed wet room adds property value, creates a level-access bathroom that suits all ages, and provides a luxurious daily experience that a standard shower cannot match. The maintenance is comparable to a standard tiled bathroom if the installation is done correctly.

The wrong situation for a wet room: tight budget, timber subfloor in poor condition, inability to verify tanking quality, or no tolerance for the project taking longer than a standard bathroom.

For a free site assessment and detailed wet room quote in Bromley or South East London, get in touch. I will visit, assess the room, and give you a written price with full specification of what is included. See also: wet room vs shower tray | what is tanking | tiling cost 2026