Minimum dimensions for a walk-in shower
The minimum size of a walk-in shower depends on exactly what you mean by “minimum.” If you’re just looking at what will barely fit in the bathroom, you’ll often end up with a width of about 80 to 90 cm. If you want an open walk-in shower that’s also comfortable to use, or if you’re looking for a custom walk-in shower, 90 x 120 cm is usually the practical lower limit. For more comfort and less splashing, 100 x 140 cm is often a better choice. In addition to the floor dimensions, the glass wall, the position of the showerhead, and the clearance in front of the shower also play a role.
What still fits really comfortably?
Anyone searching for the minimum dimensions of a walk-in shower usually wants to know not only what’s technically possible, but above all what works well in practice. There’s an important difference there. A 90 x 90 cm open shower can still be usable in a small bathroom or with a compact layout, but for a true walk-in shower without a door, that’s usually too cramped. You’ll have less room to move around, and the risk of wet floors outside the shower area increases.
That’s why 90 x 120 cm is often considered the safest minimum size. With that size, you can shower normally without the space immediately feeling cramped. If you have more room, 100 x 140 cm is noticeably more comfortable. It feels more spacious, gives you more freedom while showering, and does a better job of keeping water splashes within the shower area.
How deep should a walk-in shower without a door be?
With a doorless walk-in shower, depth is often more important than width. The water stream must be far enough from the open side; otherwise, water will splash or run into the bathroom more easily. In practice, a depth of about 120 cm is usually the minimum. If you have the space, 140 cm is even better, especially with a rain shower, higher water pressure, or if the showerhead is relatively close to the opening.
The shower enclosure also plays a role. A glass enclosure measuring approximately 90 to 140 cm is standard and helps keep water contained without sacrificing the open feel of the shower. In larger bathrooms, a longer enclosure can create a more serene atmosphere. Also, don’t point the showerhead directly at the opening, because even with a reasonably sized enclosure, this will cause water to splash outside the shower more easily.
Is 90 cm wide enough?
Yes, 90 cm wide may be enough, but only if the rest of the layout works. Ideally, combine that width with a depth of at least 120 cm, a well-placed partition, and a showerhead that doesn’t spray toward the open side. In a small bathroom, 90 cm is therefore usually the minimum requirement, not the ideal size.
For taller people, families, or anyone who simply wants a little more space, a width of 100 cm or more feels more comfortable. You’ll notice this when turning around, bending over, drying off, and cleaning. People who focus only on the minimum dimensions of a walk-in shower sometimes end up choosing one that’s too cramped. A few extra centimeters often make a bigger difference in everyday use than you might think.
How much extra space should you allow for?
Open space in front of the shower
For a walk-in shower, it’s best to leave about 100 cm of free space. This makes it more comfortable to step in, dry off, and move around in the bathroom. In a small bathroom, this isn’t always exactly feasible, but the narrower the passageway, the more quickly the space starts to feel impractical.
Drainage, Slope, and Safety
The right size is of little use if the water doesn’t drain properly. Therefore, make sure there is sufficient slope toward the drain; you can read practical tips in our article on drainage and shower channels for walk-in showers. Also, choose a floor that remains safe when wet. Especially with a compact, open shower, you’ll want to prevent the floor outside the shower area from becoming slippery.
Ventilation and Smart Placement
Good ventilation helps reduce moisture and mold growth. In addition, the placement of the showerhead is just as important as the size itself. A cleverly placed showerhead and wall work together to ensure that a compact walk-in shower functions better than a larger shower with an unfavorable layout. Want to compare options and have your space measured right away? Our in-home showroom—“How to Choose Your Walk-In Shower”— is here to help.
Frequently Asked Questions About Minimum Sizes
How far do water droplets splash from a walk-in shower?
That depends on the water pressure, the spray pattern of the showerhead, and the distance from the opening. In a compact open shower, splashes can travel surprisingly far. With sufficient depth—usually 120 to 140 cm—and a well-placed wall, you can significantly reduce that risk.
Is 90 x 90 cm enough?
For a small shower pan or a more enclosed setup, 90 x 90 cm may still work. For an open walk-in shower without a door, it’s usually too small, because you lack the depth needed to keep the water contained within the shower area.
What is the downside of a walk-in shower?
The biggest drawback is that water can splash out of the shower more easily if the size or layout isn’t right. In a small bathroom, a very open design can also feel a bit draftier than an enclosed shower stall. Not sure which to choose? Read more about walk-in showers and shower stalls.
What is the best size for a small bathroom?
In many small bathrooms, 90 x 120 cm offers the best balance between compactness and functionality. Are you replacing a bathtub with a walk-in shower? If so, check the dimensions and layout for converting from a bathtub to a walk-in shower to ensure a suitable setup. If you have limited space, a smart layout is especially important. That’s exactly when it pays to carefully consider the wall length, drain, and walking space in advance.
Not sure what size is right for your bathroom? Refresh Bathrooms works with you to design a practical layout and handles complete bathroom renovations—from consultation to installation—often in 1 to 3 days, with minimal disruption and using sustainable materials.
