Wet Room Guide: Cost, Waterproofing & Is It Worth It? (2026)

Key Takeaways

A wet room is a fully waterproofed bathroom with an open, level-access shower area.
Full tanking (waterproofing) is the critical, non-negotiable element.
Wet rooms cost more than standard bathrooms but add a sleek, accessible, high-value space.
Correct floor falls and drainage are essential to avoid pooling.
Ideal for small bathrooms, en-suites and accessible design.

Wet rooms are sleek, space-efficient and increasingly popular in London homes. Done well, they are a luxurious, accessible asset. Done badly, they leak. Here is everything you need to know before committing.

What is a wet room?

A wet room is a fully waterproofed bathroom with an open, level-access shower area that drains through a floor gully, with no tray or enclosure. The whole room is tanked so water cannot reach the structure. The result is minimalist, easy to clean, and ideal for accessible design.

Waterproofing is everything

The defining element, and the one you cannot compromise on, is tanking: a continuous waterproof membrane applied across the floor and walls before tiling, combined with correct floor falls to the drain. Get this right and a wet room lasts for decades; get it wrong and water damage is costly and disruptive to fix. This is specialist work for experienced installers.

Pros and cons

Pros: open, spacious feel, easy to clean, level access for accessibility, sleek and modern, suits small rooms.
Cons: higher cost than a standard bathroom, the whole room gets wet so storage and toilet roll need careful positioning, and quality of waterproofing is critical.

Does it suit your home?

Wet rooms work especially well as en-suites, in small bathrooms, and for accessible, future-proof design. For costs in context, see our bathroom renovation cost guide. To design and build a wet room that is watertight for the long term, contact us or call 07472 424 226.

The GS Renovation Team

GS Renovation & Home Improvements has delivered kitchen, bathroom, structural and extension projects across London for over 30 years. This guide reflects current UK industry pricing and our hands-on site experience.

Frequently Asked Questions

What is a wet room?

A wet room is a fully waterproofed bathroom where the shower area is open and at the same level as the rest of the floor, with no tray or enclosure, draining through a floor gully. The entire room is tanked (waterproofed) so water cannot damage the structure. It creates a sleek, minimalist, accessible space.

How much does a wet room cost?

A wet room typically costs more than a standard bathroom because of the full tanking, careful floor falls and often underfloor heating. In London, expect figures at the higher end of the bathroom range, broadly £10,000 to £20,000 or more depending on size and specification. See our bathroom cost guide for context.

Is waterproofing a wet room important?

It is the single most important element. The entire wet room must be properly tanked (a continuous waterproof membrane) under the tiles, with correct floor falls to the drain. Poor waterproofing leads to leaks and structural damage that are very expensive to put right, so it must be done correctly by experienced installers.

Is a wet room a good idea for a small bathroom?

Yes, wet rooms often suit small bathrooms and en-suites particularly well, because removing the shower enclosure opens up the space and makes a compact room feel larger and more streamlined. Level access also makes them ideal for accessible and future-proof design.

Do wet rooms add value?

A well-built wet room can add value and appeal, especially as a luxurious en-suite or an accessible bathroom. The key word is well-built: a properly tanked, well-drained wet room is an asset, whereas a poorly waterproofed one is a liability, so quality of installation is everything.

Wet Room Guide

Key Takeaways

What is a wet room?

Waterproofing is everything

Pros and cons

Does it suit your home?

Frequently Asked Questions

Planning a Project in London?