Wet Room vs Shower Tray: Which Is Right for Your London Bathroom?

Wet Room or Shower Tray: The Core Difference

The choice between a wet room and a shower tray is one of the most consequential decisions in a bathroom renovation. It affects the cost, the installation complexity, the long-term maintenance, and the visual outcome of the finished room. In London, where a high proportion of bathrooms are in flats above other dwellings, the structural and waterproofing implications carry additional weight.

A wet room is a fully tanked shower area with a floor drain set flush with the floor level — there is no tray, no threshold, and no enclosure lip to step over. The floor slopes gently toward the drain, typically at a gradient of around 1 in 80. The waterproofing is achieved by tanking the entire floor area and the lower sections of the walls with a specialist membrane system before tiling. The result is a level-access, seamless shower area that looks clean and contemporary and is highly practical for users with mobility considerations.

A shower tray sits on the floor or on a riser kit and provides a contained, pre-formed waterproof basin for the shower. The tray itself is the primary waterproofing element, with sealant around the edges completing the barrier. Installation is considerably simpler and faster than a wet room, the risk of water penetration to the substrate is lower, and the costs are substantially reduced.

Waterproofing Requirements in London Flats

In a London flat above another dwelling, a water leak from a poorly waterproofed wet room is not merely inconvenient — it is a potential insurance claim, a dispute with the freeholder or management company, and a source of serious damage to the property below. The tanking specification for a wet room in a flat must be to a high standard. A full tanking system using a cementitious slurry or a sheet membrane system bonded to the substrate is required, extending at least 150 millimetres up all walls and 100 per cent of the floor area. The membrane must be taken behind any floor drain flange and sealed with the appropriate primer and jointing tape at all junctions.

A shower tray in a flat is significantly lower risk because the tray itself is the primary waterproofing barrier, and failures are typically visible before water penetrates the floor structure. For landlords and flat owners concerned about liability, a quality shower tray installation with properly cured and maintained sealant is often the more prudent choice.

Drain Position and Floor Joists

In properties with suspended timber floors — the majority of Victorian and Edwardian conversions that make up a large proportion of London flats — the position of the drain in a wet room is critical. The drain must be positioned to avoid cutting through floor joists. In a wet room where the drain must sit flush with the finished floor surface, this means either routing the waste through the void between joists to a suitable exit point, or using a low-profile drain designed to connect at joist level. In some cases, a structural engineer must be consulted before cutting into floor members to accommodate drainage.

Anti-Slip Tile Requirements

Wet room floors must be tiled with anti-slip tiles to a minimum slip resistance rating suitable for wet barefoot use. The Tile Association recommends a minimum R10 rating for shower floors and wet rooms. Smooth large-format porcelain tiles that look elegant in dry areas are typically not appropriate for a wet room floor without surface texture or profiling. The choice of tile must therefore balance the aesthetic goal of the room with the practical safety requirement. Many designers address this with a textured tile in the wet room floor zone that complements smoother tiles on the walls.

Cost Comparison

A shower tray installation in London — including the tray, waste, mixer valve or electric shower, and a glass screen — typically costs between £800 and £1,500 supply and fit, depending on the size and quality of the components. The installation is generally completed in one to two days once the plumbing is prepared.

A wet room conversion costs considerably more. Full tanking, a floor former or screeded gradient, a quality floor drain, anti-slip tiles, and the associated labour typically fall between £2,500 and £5,000 for a standard bathroom footprint, and can exceed this in larger rooms or where complex drainage routing is required. The premium is real but delivers a result that is genuinely difficult to achieve by any other means.

Which Is Right for Your Property?

For a London flat where water penetration risk to the property below is a concern and budget is a priority, a quality shower tray with a frameless glass screen delivers an excellent result at lower risk and lower cost. For a ground-floor flat, a period house, or a property where accessibility matters, a wet room is a strong choice. For new build properties with concrete floors and simple drainage routing, the wet room installation is more straightforward and the cost premium is smaller. For a rental property being prepared for the letting market, the shower tray offers easier maintenance and more straightforward tenant management — a cracked or failed tray seal is easier for a tenant to report and easier to fix than a failed wet room tanking membrane.