The 800mm Minimum: Why We Don’t Build a 700mm Steam Shower

You’ve measured the space. A 700 x 700 shower enclosure fits. The retailer says it’s a standard minimum. So why does it feel tight when you stand inside one?

That instinct is worth listening to. The 700mm dimension exists in the wider shower market, but it was never set with steam in mind. If you’re researching a steam shower for a small bathroom or en suite, the honest minimum is 800mm in a quadrant configuration – and there’s a clear engineering reason for that.

This guide explains where the 700mm figure came from, why steam asks more of the space than a standard shower, and what to do if your bathroom only has the smaller footprint to work with.

Where the “700mm minimum” came from

A 700 x 700 shower enclosure has long been listed as the technical minimum across UK bathroom retailers, with several mainstream retailers citing 760 x 760mm as the comfort minimum and 700 x 700mm as the smallest enclosure most manufacturers will produce.

That figure isn’t wrong. It’s just answering a different question.

It tells you the smallest space in which an adult can stand and wash without continuously brushing the walls. It does not tell you whether a steam generator, a Vernet thermostatic valve, and a 15-minute heat session will work safely inside that footprint.

What does the wider trade actually recommend?

Even for a standard, non-steam shower, the comfort minimum has crept upwards. As Homebuilding & Renovating advises in their shower enclosures guide, it is wise to go no smaller than 900 x 900mm to avoid feeling cramped. That’s the industry baseline for an everyday shower with no heat element involved at all.

Steam adds a second set of requirements on top of that. Which is where the maths changes.

Why a steam shower asks more of the space than a standard shower

A standard shower is a water environment. A steam shower is a heat-and-water environment. The two have different demands.

In a normal cubicle, water leaves your body, falls to the tray, and drains. You’re in and out in five minutes. The walls stay cool. The glass stays cool. Your elbows can clip the screen, and nothing happens.

A steam session works differently. The cabin needs volume for steam to circulate around you. Heat rises and accumulates – which is why our Essence 900 model alone requires a minimum ceiling height of 2,200mm. The user needs to be inside the steam, not pressed up against the glass it’s condensing on. And the maximum steam session is strictly 15 minutes – a safety limit set to protect the integrity of the glass seals and the acrylic.

Industry installer guidance from Bender Plumbing places the minimum recommended steam shower at 3ft x 3ft x 7ft for comfort, safety, and functionality. That’s roughly 900mm x 900mm x 2,100mm.

So why does Vidalux build at 800mm?

Because of geometry. A square 800mm cabin would be tighter than the 900mm guidance suggests is comfortable. But an 800mm quadrant – with a curved front, a corner-mounted column, and a sliding door system – reclaims the elbow room a square 800mm wouldn’t. The diagonal across the corner is more than 1,00mm. That’s enough to relax in.

Below 800mm, the geometry stops working. The diagonal collapses, the column eats the floor space, and the user is in constant contact with hot glass during a 15-minute session. Worth noting: this isn’t a comfort preference. It’s an engineering limit.

The Elbow Room Rule

Here’s a practical test. Stand in a shower cabin. Put both elbows out at 90 degrees. Do they touch the glass on either side?

In a 700 x 700 enclosure, the answer for most adults is yes. Both elbows make contact, on both sides, simultaneously. That’s manageable for a five-minute shower. It’s untenable for a 15-minute steam session, where you’re sitting still on a stool with the cabin warmed and humid.

The Elbow Room Rule is simple: if you can’t extend your elbows without touching the cabin, the cabin is too small for steam.

There’s a second part to it – the reach test. The thermostatic control on a Vidalux shower valve has a factory safety stop at 38°C, which means you’ll be reaching to set, adjust, and turn off the unit during your session. In an 800mm quadrant, the controls fall within the natural arm’s reach from the seated stool position. In a 700mm cabin, you’re leaning into the steam outlet to reach them.

In our experience, customers asking about a 700mm steam shower are usually working with a small en suite where 800mm seems impossible at first glance – until you put a quadrant in the corner. The space is almost always there once the shape changes.

Which leads to the part most people don’t realise.

Why an 800mm Quadrant Changes The Maths

The 800mm quadrant is the smallest steam shower we build, and the small-bathroom upgrade most people think they can’t have.

A 700 x 700 square enclosure sits flush against two walls and projects 700mm into the room. It’s a box. It takes up the corner and a chunk of floor on either side.

An 800mm quadrant works differently. It sits in the corner using the two existing walls, but the front is curved. That curve gives the room back its corner. Looked at from above, an 800 x 800 quadrant uses less visible floor area than a 700 x 700 square in many small en-suites – because the diagonal cuts across rather than projecting straight out.

Door entry on the Essence 800 uses a full sliding door system, not the narrow pivot opening you’d typically find on a small square cabin. The entry is generous, and the sliding mechanism means no out-swing clearance to plan for – useful when the WC or basin sits within a metre of the cabin.

A few practical specifications worth noting:

• 800 x 800 x 2,200mm external dimensions
• 90mm fast-flow waste for quick drainage
• Adjustable levelling feet under the tray (for imperfect floors)
• Reinforced acrylic base on a steel frame
• Full 5mm safety glass throughout

What about installation in older bathrooms?

The Quick Build framework on the Essence 800 is screw-free at the main structural points – which means installers can typically build the main shell in under an hour.

Vidalux’s Leak-Seal technology means there’s no silicone on show, and in the unlikely event water bypasses the compression seals, the tray’s return channels redirect it back inside the cabin. There’s nothing fixed behind a wall to fail.

That last point matters more than it sounds. The number-one failure point in cheaper steam cabins is water finding its way behind the structure during a heat cycle – and being trapped there. The Leak-Seal design removes that possibility entirely.

The Vidalux Approach: The Essence 800

The Essence 800 is Vidalux’s smallest steam shower and our flagship quadrant. It’s the unit we recommend for small bathrooms and en-suites where a 1,200mm or 1,400mm cabin would dominate the room.

The headline specification:

• 2.8KW fast-start steam generator
• Vernet thermostatic shower valve with factory 38°C scald protection
• Large stainless steel overhead monsoon shower
• Three multi-spray body jets (30 sprays in total)
• Bluetooth and DAB radio
• Touchscreen control panel with full remote control
• Internal chromotherapy mood lighting
• Ozone sterilisation cleaning cycle
• Compatible with all combi boiler systems
• 5-year warranty on registration

It’s also fully customisable. You choose the backboard finish (Black, White, or Mirror), tray and roof colour (Black or White), column finish (Black or Silver), framework (Black or Stainless Steel), and floor insert (Black, White, or Wood). The shower is configured to suit your bathroom, not the other way around.

What if 800mm genuinely won’t fit?

Then a steam shower isn’t the right product for your space – and we’d rather tell you that than sell you something that won’t work. If you only have 700mm to work with, our Hydro Shower Cabins range gives you premium showering, the same Leak-Seal technology, the same no-silicone build, and the Quick Build framework – just without the steam generator. The Kontrast 800 Square is the closest like-for-like alternative and a strong choice in tight footprints.

It’s not the shower you came looking for. It is the shower built to last.

A small bathroom isn’t a barrier – it’s a shape question

If you’ve been worried that a small bathroom rules out steam altogether, the honest answer is: it depends on what shape you can give the space.

A 700 x 700 square doesn’t fit a steam shower. An 800 x 800 quadrant usually does, and it returns more of the room to you than the smaller square would. The 800mm minimum isn’t a marketing position – it’s where the geometry, the engineering, and the steam circulation all line up.

Browse the steam shower range to see the Essence 800 alongside our larger models. The right cabin is the one built to do the job properly, in the space you’ve got.

Choose with confidence.

Frequently Asked Questions

Will a 700 x 700 fit a steam shower?

A 700 x 700 shower enclosure will not fit a steam shower. The honest minimum for a steam shower is 800 x 800mm in a quadrant configuration. At 700mm, there’s not enough space for safe steam circulation or comfortable elbow room.

What is the smallest Vidalux steam shower?

Vidalux’s smallest steam shower is the Essence 800, an 800 x 800mm quadrant with a 2.8KW fast-start steam generator. It includes a Vernet thermostatic valve, Leak-Seal technology, customisable finishes, and a 5-year warranty on registration. It stands 2,200mm tall.

Why is 800mm the minimum for a steam shower?

800mm is the minimum because steam requires space to circulate around the user, and the user needs clearance from heated glass and walls during a 15-minute session. Below 800mm, elbow contact with the cabin becomes constant, and reaching the controls becomes uncomfortable.

Can I fit an 800mm quadrant steam shower in a small bathroom?

Yes. An 800 x 800 quadrant steam shower fits neatly into a corner using two existing walls. The curved front means it uses less visible floor area than a square enclosure of the same footprint. Most small UK en-suites can accommodate an 800mm quadrant.

What if I only have 700mm of space?

If your bathroom only fits 700mm, a steam shower isn’t the right product. A high-quality hydro shower cabin – like the Vidalux Kontrast 800 range – gives you premium showering without the space demands of a steam generator.

DISCLAIMER: All specifications, claims, and advice relating to any internal or external procedure, practise, product, or service were true at the time of writing. For more accurate and up-to-date details in relation to Vidalux services, please visit the relevant dedicated on-site page. For any product-related information, specifications, or guidance, the information on the product page should be considered the governing source.