Install a wet room.

Beyond the aesthetic appeal, wet rooms are highly practical for multi-generational living and can significantly increase property value. However, because the floor must be perfectly graded and sealed, the installation requires high-level technical expertise to prevent long-term damp issues.

What Does the Work Involve?

• Site Assessment: Checking floor joist strength and identifying the waste pipe location to ensure sufficient fall for drainage.
• Strip-out: Removing existing fixtures, flooring, and wall coverings back to the substrate.
• Floor Preparation: Installing a "former" (a sloped tray set into the floor) or creating a screed gradient towards the drain.
• Tanking: Applying a multi-layer waterproof membrane to the floor and walls to create a sealed "envelope."
• Drainage Installation: Fitting a high-capacity wet room trap and connecting it to the main waste system.
• Tiling and Grouting: Laying non-slip tiles using waterproof adhesive and epoxy grout for maximum durability.
• Second Fix: Installing the shower valve, screen (if required), and any remaining sanitaryware.

Typical Costs

The cost of a wet room is higher than a standard bathroom because of the intensive structural preparation and waterproofing required. Prices in 2025/26 reflect the increased cost of high-quality tanking systems and skilled labour.

Factors affecting the final price include the condition of your subfloor, the choice of tiles (natural stone requires more maintenance and sealing), and whether you need to relocate the waste pipes.

How Long Does It Take?

• Standard Conversion: 7–10 working days.
• Structural Prep & Tanking: 2–3 days (including curing time for membranes).
• Tiling & Grouting: 3–5 days depending on the complexity of the pattern.
• Final Fitting & Testing: 1 day.

DIY or Professional?

Wet room installation is not recommended for DIYers. Even a pin-sized hole in the waterproof membrane can lead to catastrophic structural rot or ceiling collapse in rooms below.

Professional installers provide insurance-backed guarantees, ensuring that if a leak does occur, the rectification costs are covered.

You will also need a qualified electrician for any lighting or underfloor heating (Part P compliance) and a plumber experienced specifically in wet room drainage gradients.

Choosing the Right Tradesperson

• Check Specialisms: Look for a tiler or bathroom fitter who specifically advertises "tanking" or "wet room" expertise, rather than just general plumbing.
• Request Portfolios: Ask to see photos of the "tanking" stage, not just the finished tiles, to ensure they follow correct waterproofing protocols.
• Insurance: Verify they have public liability insurance and ask if they offer a long-term watertightness guarantee (typically 10+ years).
• Questions to Ask:
  • What tanking system do you use (liquid or matting)?
  • How will you ensure the floor has the correct 1:40 fall for drainage?
  • Will you provide a Part P certificate for the electrical work?

UK Regulations

• Building Regulations: While a simple bathroom refit doesn't usually need notification, a wet room involving structural floor changes or new drainage may.
• Part P (Electrical Safety): All electrical work in "special locations" like bathrooms must be carried out by a competent person and certified.
• Part M: If you are installing the wet room specifically for accessibility, it should comply with guidelines for clear turning circles and grab rail reinforcements.

Common Problems

• Pooling Water: Caused by an incorrect floor gradient; water should never sit still on the tiles.
• Leaking Thresholds: If the "tanking" doesn't extend far enough out of the door, water can wick into carpets in adjoining rooms.
• Grout Failure: Using standard grout instead of epoxy or high-polymer grout can lead to cracks and water ingress.
• Slippery Surfaces: Using polished tiles instead of tiles with a high "R" (slip resistance) rating can make the room dangerous when wet.

Frequently Asked Questions