How to choose a shower for your enclosure & tray

Most shower-buying guides answer one of two questions: which type of shower to buy, or which finish to pick.

They skip the question that decides whether the result actually works in your space, which is whether the shower fits the enclosure and tray you’re fitting it over.

A 400mm rainfall head in a 800mm cubicle wastes water on the door. A wall-arm head in a low-ceiling bathroom catches the back of a tall user’s head. A handset on a riser rail mounted on the wrong wall makes a tray feel cramped. None of these is the shower’s fault they’re fit problems.

This guide walks you through the matching properly: start with the space, check the head clearance, work out where the controls and head should go, and read the trays and walk-ins differently. Get this right and the shower works the first time.

Start with your space

UK home showers sit in one of four space types, and each asks slightly different things of the hardware.

Layout	What it is	Best suited to
Standard enclosure	Square or rectangular, typically 800×800mm to 1200×800mm. The default cubicle shape with a tray, glass walls and a door.	Any shower type, with the head on a wall arm and the controls on the same wall as the door for easy reach.
Walk-in enclosure	Open-fronted, often 1200×800mm or larger. One or more fixed glass panels with no door, walking straight in from the bathroom floor.	Dual-outlet thermostatic showers with a rainfall head and a handset — the open space makes the most of the experience.
Wet room	No enclosure, sloped floor draining to a linear or point drain. The most open layout, with the shower zone defined by tile rather than glass.	Rainfall and dual-outlet systems; the only layout that fully removes the trip hazard at the entry.
Over-bath shower	Shower hardware mounted at one end of a bath. The common compromise in smaller bathrooms.	A single-outlet thermostatic mixer with a handset on a riser rail, so the height adjusts for both showering and bathing.

If you don’t have your enclosure yet, the shower system you want often dictates what space type to pick. If you do have it already, work from what’s there.

Rainfall head clearance

This is the single most-skipped check on a rainfall shower, and the one that catches the most installs out. A rainfall head needs height above the user to fan the water properly before it reaches them; mount it too low and you get a heavy splash rather than a rainfall feel. The clearance numbers that matter, measured from the finished floor to the underside of the head:

User context	Minimum clearance	Comfortable clearance
Average adult (up to 5'10" / 178cm)	2.1m	2.2m
Taller user (over 6' / 183cm)	2.2m	2.3m or more
Wall-arm mounted head	2.1m	2.2m
Ceiling-mounted rainfall head	2.2m	2.3m or more

Two things to know about these numbers.

First, the measurement is to the underside of the head, with the head in its installed position not the bracket where it attaches to the wall or ceiling.

Second, a standard UK ceiling is around 2.4 metres, which leaves limited room for a ceiling-mounted head once you account for the head depth and the user height. In a low-ceiling bathroom, a wall-arm rainfall with a short drop is usually a better fit than a ceiling-mounted one.

Matching to tray size and outlet position

The tray decides three things about the shower: how big the head can sensibly be, where the controls should sit, and whether the layout will feel cramped or comfortable in use.

On head size: aim for a head that covers a good proportion of the tray width but leaves a margin to avoid spraying the glass or the door. As a guide, a 200mm rainfall head suits an 800mm tray, a 250mm head suits a 900mm tray, a 300mm head suits a 1000–1200mm walk-in, and 400mm heads need a wet room or a large walk-in to make sense. Over-sized heads in tight enclosures waste water on the door — most of the spray ends up on the glass rather than the user.

On controls and outlet position: the shower should be aimed at the tray from the wall opposite the entry, not the wall next to the door.

Two reasons.

First, you walk past the controls to step into the shower, which means the water isn’t running across the entry while you’re mid-step.

Second, you face into the shower with your back to the door, which is the natural showering position. If your existing pipework forces the controls to the wrong wall, a fitter can re-route in most cases, but it’s easier to plan it right from the start.

Walk-in and wet-room layouts

These open layouts deserve a section of their own because they change what the shower has to do. With no door and an open front, the showering zone needs to keep water inside without the help of an enclosure boundary — so head positioning and spray pattern matter more than they would in a cubicle.

Consideration	Guidance
Head angle	Aim the head inward, not towards the open edge of the walk-in. A rainfall head dropping straight down is fine; an angled head pointed at the bathroom floor is not.
Glass panel length	Pair a rainfall head with a glass panel extending past where the user stands, so any forward splash hits glass rather than the bathroom floor. The standard length is around 1200–1400mm of fixed panel for a 900–1100mm showering zone.
Floor fall (wet rooms)	Slope the floor away from the rest of the bathroom and towards the drain, so any water that escapes the shower zone heads to the drain rather than across the floor.
Floor space	Allow generous room. A walk-in or wet room only feels luxurious with space to be — 900mm width is the practical minimum, 1200mm or more is where the layout starts to feel right.

How to match a shower to your enclosure

A five-step process to get the right shower for your space:

Step 1. Identify your space type (standard enclosure, walk-in, wet room, or over-bath). The space type sets the suitable shower formats. A walk-in benefits from a dual-outlet thermostatic; an over-bath usually wants a single-outlet mixer with a handset on a rail.

Step 2. Measure your ceiling height to the finished floor. This decides whether a rainfall head is realistic and whether it should be wall-arm or ceiling-mounted. Below 2.3 metres, choose a wall-arm rainfall with a short drop or a conventional fixed head.

Step 3. Measure your tray (or walk-in zone). The tray width sets the maximum head size: 200mm head on an 800mm tray, 250mm on 900mm, 300mm on 1000–1200mm, 400mm in a larger walk-in or wet room.

Step 4. Plan where the controls and head go. Aim for the wall opposite the entry, with the controls reachable without stepping into the spray. If your existing pipework doesn’t match, get a fitter to advise on whether re-routing is sensible.

Step 5. Choose the format that suits the space and your water system. Walk-in and wet room: thermostatic dual-outlet, exposed bar or concealed. Standard enclosure: thermostatic mixer in any format. Over-bath: thermostatic mixer on a riser rail or an electric shower. The water-system match still applies.

If you’re unsure about water-system compatibility, read best shower for your water system before you commit to a model.

Enclosure & tray FAQs

How much head height do I need for a rainfall shower?

At least 2.1 metres from the finished floor to the underside of the head for an average adult, with 2.2 to 2.3 metres more comfortable. Taller users and ceiling-mounted rainfall heads need 2.2 to 2.3 metres minimum. In a low-ceiling bathroom (UK standard around 2.4 metres), choose a wall-arm rainfall with a short drop.

What size rainfall shower head fits an 800mm tray?

Around 200mm, sometimes up to 250mm if the tray is square rather than narrow. Anything larger ends up spraying the glass door or the cubicle walls rather than the user. The wider the tray, the bigger the head you can sensibly fit.

Where should the shower controls go in an enclosure?

On the wall opposite the entry, not next to the door. That way you walk past the controls into the spray rather than reaching across it, and the natural showering position has the user facing into the cubicle. Most existing pipework can be re-routed if the controls are on the wrong wall.

Can I fit a rainfall shower over a bath?

It’s possible but rarely ideal. Rainfall heads are best at a fixed height above a user standing still, which is awkward in a bath where you switch between standing and sitting. A conventional showerhead on a riser rail is usually the better choice over a bath, with the height adjusted for showering or filling.

What’s the best shower for a walk-in?

A thermostatic dual-outlet system: a fixed rainfall head plus a handset on a hose, switched with a diverter. The open layout benefits from both outlets, the temperature stability matters in a room with no enclosure to trap steam, and the handset is practical day-to-day for hair washing and rinsing.

Once you’ve matched the shower to your space, shop rainfall shower systems, dual outlet shower systems, or browse the full showers range. If you’re also planning the enclosure or tray itself, the rest of the bathroom range covers both.

We’ve been helping people plan showers since 1999, with a 4.8/5 rating from over 60,000 Trustpilot reviews, free UK delivery, a price match promise and 365-day returns, so a careful match is a low-risk decision to make.

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