A 1200 x 800mm shower enclosure is the size most UK bathrooms should be aiming for. It gives you a proper 800mm-wide standing space without the door banging into the loo, it drops neatly into a standard alcove or a corner, and there’s more choice of trays and doors at this size than at any other. If your room’s tight, step down to 900 x 900 or 800 x 800. If you’ve got a long wall to play with, 1400mm and up opens the door to walk-in setups. The number on the box is only half the job though. What actually decides whether it fits is your finished wall measurement, the door type and how out-of-true your walls are.

Here’s every common UK size, who each one suits, the door and tray that pair with it, and how to measure so it goes in first time.

• UK shower enclosure sizes at a glance
• 1200 x 800 shower enclosure: is it big enough?
• 1200 x 900 shower enclosure
• 900 x 900 and the square sizes
• 1400 x 800 and bigger: why it’s usually a walk-in
• Which door suits which footprint
• How to measure up so it actually fits
• FAQ

UK shower enclosure sizes at a glance

Shower enclosures are sold by their footprint in millimetres, and the first number is the width along the wall, the second the depth out into the room. UK ranges run from about 700 x 700 up to 1700 x 700. Square sizes sit in a corner, rectangular sizes fit a longer alcove or corner run, and once you get past 1400mm you’re usually looking at a walk-in rather than a boxed kit. Use the table as a shortlist, then measure your wall before you commit to anything.

Size (footprint)	Who it fits	Door types that work	Matching tray
700 x 700	Ensuite or cloakroom shower, tightest corner	Quadrant slider, bi-fold, pivot	Square 700 tray
800 x 800	Small bathroom, single-person ensuite	Quadrant slider, hinged with side panel	Square 800 tray
900 x 900	The comfortable square shower for most rooms	Quadrant double-slider, hinged with side panel	Square or quadrant 900 tray
1000 x 700	Narrow alcove that’s longer than it is deep	Sliding door in an alcove	Rectangular 1000 x 700 tray
1200 x 800	The sweet spot for most family bathrooms	Sliding door in an alcove, offset quadrant in a corner	Rectangular 1200 x 800 tray, or a walk-in pack with the tray included
1200 x 900	Generous alcove, extra standing depth	Sliding door with side panel, offset quadrant	Rectangular 1200 x 900 tray
1400 x 800	Big bathroom edging into walk-in territory	Walk-in panel (open) or a long sliding door	Large rectangular tray or wetroom former
1700 x 700	Long wall, walk-in or wetroom layout	Fixed walk-in panel, no door	Wetroom former plus panel

If you’re stuck between two sizes, drop down rather than up. A 900 x 900 in a room that could just about swallow a 1000 x 800 leaves you more walkway and a bit of breathing space. The bigger footprint crammed into a spot that really wanted the smaller one is the one you’ll fight with every morning. Browse the full shower enclosures range to see what’s made in each size before you decide.

1200 x 800 shower enclosure: is it big enough?

Yes, for the vast majority of people a 1200 x 800 is plenty. You get 1200mm of width to move your elbows and 800mm of depth to stand and turn without brushing the glass, which is a noticeably roomier shower than a 900 x 900 square even though the floor area is similar. It’s the size that gives you the most flexibility on layout too: drop it into an alcove with a straight sliding door, or sit it in a corner as an offset quadrant with the curved glass softening the edge.

Here’s the bit the size charts skip: the tray is a decision in its own right. You’ve got three sensible routes. Buy a walk-in pack that comes with its own tray, fit a standalone 1200 x 800 rectangular tray, which is a stocked size, or go offset quadrant and use a quadrant tray shaped for that corner.

For the pack route, the Scudo S8 Matt Black 1200 x 800 Walk-in Enclosure with Shower Tray at £579 takes the guesswork out. The pack includes a 700mm and an 800mm matte black wetroom panel, a matte black hinged deflector, a stone 1200 x 800 shower tray and a 90mm shower waste, so the tray is already matched to the space. The glass is 8mm easy-clean, the finish is matte black throughout and it carries a lifetime guarantee. It’s a walk-in rather than a boxed enclosure, so if you want a fully closed cubicle instead, look at the rectangular shower enclosures range and pair it with a rectangular tray. For the corner option, the Kudos Kstone 1200 x 800 Offset Quadrant Shower Tray at £239 is built for exactly that job: a low-profile 1200 x 800 offset quadrant tray with a reinforced build, an easy-clean surface and standard waste compatibility, shaped for a corner quadrant installation.

If you want the full run-down on getting the tray right, our guide to what size shower tray do I need covers profiles, wastes and how the tray decides your step-in height.

1200 x 900 shower enclosure

A 1200 x 900 is the upgrade when you want the extra depth. That 100mm over a 1200 x 800 doesn’t sound like much on paper, but it’s the difference between turning freely and being aware of the glass behind you, and it’s a genuine luxury if two people share the bathroom. It suits a longer alcove or a wide corner where the wall can take the depth without stealing your walkway.

Unlike the 1200 x 800, the tray here is straightforward: a rectangular 1200 x 900 tray is a stocked size, so you pair the enclosure and tray one for one. On door choice, a sliding door with a fixed side panel is the classic fit for this footprint in a corner, because the slider means nothing swings out into the room. If you’re fitting it into a three-wall alcove instead, a straight sliding door on the open face does the job on its own. Have a look at the rectangular shower trays range for the matching 1200 x 900, and see the shower enclosure types compared guide if you’re weighing sliding against hinged and quadrant.

900 x 900 and the square sizes

A 900 x 900 shower enclosure is the biggest square that fits comfortably in a normal-sized bathroom, and it’s the one I’d point most people at if a corner shower is the plan. It gives you a proper standing area without the width of a 1200mm run, so it’s ideal where the shower shares a wall with a bath or a long vanity. Below it, 800 x 800 works for a small bathroom or a single-person ensuite, and 700 x 700 is the smallest you’d want to stand in, really an ensuite-or-cloakroom size for when space is the whole problem.

Quadrant is the natural shape at these sizes: the curved corner glass tucks the shower neatly into the angle and the sliding doors mean nothing swings out. The Litchfield Glide Brushed Brass Double Door Quadrant Enclosure 900 x 900mm at £229 is a good example: a brushed brass frame, double sliding doors so you can get in from either side, a space-efficient quadrant layout and 6mm toughened safety glass. It comes with a lifetime guarantee. Brushed brass is having a moment, so it’s a way to make the shower a feature rather than something you hide in the corner.

For the tray, a square shower tray matches these footprints directly. The Shires 800 x 800mm Eco Stone Square Shower Tray at £119 is a slim 30mm low-profile tray in eco stone resin with a white finish and a 90mm waste outlet (the waste isn’t included). It’s a rigid, durable base for an 800 x 800 corner, and it can go on the floor or be raised. If you’d rather use a curved quadrant tray under a quadrant enclosure, match the tray shape to the enclosure and check the radius lines up. The quadrant and corner shower enclosure guide goes deeper on getting the curve and the corner right.

1400 x 800 and bigger: why it’s usually a walk-in

Once you go past 1400mm, boxed enclosure kits start to run out. A 1400 x 800 shower enclosure, or a 1600 x 800, or a 1700 x 700, is a lot of glass and framing to hang off a door mechanism, and the sliding tracks and seals don’t scale up neatly. So at these sizes the trade moves to a different setup: a large rectangular tray or a wetroom former, with a fixed walk-in glass panel standing on it and an open entry, no door at all. That’s why, if you search a 1400mm size, you’ll often find shower tray pages rather than enclosure pages, because the enclosure is really just a tray plus a panel.

It’s a good setup if you’ve got the room for it. A walk-in feels open and easy to clean, there’s no door to wrestle, and you can size the tray to the wall. The trade-off is spray: with no door you need enough length so the water stays in, which is why walk-ins are long (1400mm and up) rather than square, and you may want a short deflector panel like the one bundled in the Scudo pack above to stop overspray. If this is the direction you’re going, the walk-in shower enclosures range is where to start, and pair it with a large tray from the rectangular shower trays range or a wetroom former.

Which door suits which footprint

The size gets you a shortlist, but the door type is what makes the shower nice to use. Quick run-down of what pairs with what.

• Sliding door. The default for wider alcoves, 1200mm and up. Nothing swings out into the room, so it’s the one to pick when the shower faces a wall, a loo or a towel rail with no clearance in front. Browse sliding shower doors for the alcove sizes.
• Quadrant slider. Curved doors that follow the corner shape, made for square sizes from 700 x 700 to 900 x 900. Space-efficient and no swing.
• Hinged or pivot door. Best on narrower openings, 760mm to 900mm, and it needs clear floor in front to swing open. Feels solid, but measure the swing before you commit.
• Bi-fold door. Folds in on itself, so it’s the space-saver for a tight room where a hinged door would foul the loo or the basin.
• Walk-in panel. A fixed pane, no moving door, for 1400mm-plus trays and wetrooms. Open, easy, needs the length to keep the water in.

How to measure up so it actually fits

An enclosure that’s 15mm too wide is an enclosure you’re sending back, so measure properly before you order. Run through this list with a tape.

• Measure finished wall to finished wall. The number that matters is the gap once the walls are tiled, not the bare plaster or blockwork. Tiles and adhesive eat 10mm to 15mm off each face, so a 1200mm bare opening can finish nearer 1170mm once it’s tiled. If the tiles aren’t on yet, work out the finished dimension and use that, or you’ll order to the wrong size.
• Tiles on or off. Decide early whether the enclosure sits on top of the tiles or the tiles butt up to it, because it changes your target measurement. Enclosures fix to the tiled surface, so measure to where the tiles will be.
• Check for out-of-true walls. Almost no wall is dead straight or dead plumb. Measure the opening at the top, the middle and the floor, and hold a level against the wall to see how far it leans. Take the smallest of your three width readings as the size to buy for, or the enclosure won’t slide into the narrowest point.
• Use the adjustment tolerance. This is what saves you. Framed enclosures come with wall profiles that adjust, usually giving you 20mm to 30mm of play per side to swallow an out-of-true wall. Check each product’s adjustment range and make sure your opening falls inside it. If a wall is badly off, that tolerance is the difference between a clean fit and a visible gap.
• Leave yourself a walkway. Once the enclosure and tray are in, you still have to open the door and step past it. Check the door type doesn’t swing into the basin, the loo or the room door, and that you’ve room to actually get in.

Get the tray level and bedded properly while you’re at it. A tray that rocks or falls the wrong way is the single most common cause of a leak later, and it’s a lot easier to sort before the glass goes on than after.

FAQ

Is a 1200 x 800 shower enclosure big enough?

For nearly everyone, yes. A 1200 x 800 gives you 1200mm of width and 800mm of depth, which is a roomier, more comfortable shower than a 900 x 900 square. It’s the size most family bathrooms should aim for. The only reason to go bigger is if you specifically want the extra depth of a 1200 x 900, or you’ve got the wall for a walk-in. On the tray, you can pair it with a standalone 1200 x 800 rectangular tray, go offset quadrant for a corner, or buy a walk-in pack with the tray included.

Which door suits a 1200 x 900 shower enclosure, sliding or hinged?

A sliding door, in almost every case. At 1200 x 900 a sliding door (with a fixed side panel if it sits in a corner) means nothing swings out into the room, which matters at this width because a hinged door would need a big clear arc in front of it. Reserve hinged and pivot doors for narrower openings around 760mm to 900mm where you’ve got the floor space for the swing.

What size is a 900 x 900 shower enclosure and who is it for?

It’s a 900mm by 900mm square footprint, the largest square that still fits a normal-sized bathroom comfortably. It suits a corner shower where the wall is shared with a bath or a vanity, and it usually pairs with a quadrant enclosure so the curved glass tucks into the corner and the sliding doors don’t swing out. Below it, 800 x 800 works for a small ensuite and 700 x 700 is the smallest you’d want to stand in.

Can you get a 1400mm shower enclosure?

Not usually as a boxed kit. At 1400mm and above the shower is normally a large rectangular tray or wetroom former with a fixed walk-in panel and an open entry, rather than a door-and-frame enclosure. That’s why searching a 1400 x 800 tends to turn up tray pages. Look at the walk-in range for these sizes and pair it with a large tray or a wetroom former.

Worth a read next: if the tray is your sticking point, start with what size shower tray do I need. To settle sliding versus quadrant versus hinged, read shower enclosure types compared, and for a corner shower specifically the quadrant and corner shower enclosure guide goes deeper. Once you know your size, the full shower enclosures range is the place to browse.