ᐅ Bathroom layout of a 4.5 sqm ground floor bathroom with a shower

I can’t tell you if 90x80 is enough. The standard size is usually closer to 90x90.

The best approach is to visit a bathroom showroom or a home improvement store and stand inside different shower enclosures to get a sense of the space.

Personally, I would go with 100x80. That size should still be very comfortable. You would just need to make sure the shower head is positioned smartly.

Could the door still be moved?

Koempy schrieb:
I would rather choose 100x80. That should still be a very comfortable size. The only thing needed is to install the shower head thoughtfully.

Would you mount it on the 80cm (31.5 inches) side or the 100cm (39 inches) side?

On the 80cm (31.5 inches) side, there is a rain shower. We have a similar walk-in shower ourselves, measuring 90 x 150cm (35 x 59 inches). The shower is located on the 90cm (35 inches) side.

Koempy schrieb:
On the 80cm (31.5 inches) side, there’s a rain shower. We have a similar walk-in shower ourselves, 90 x 150cm (35 x 59 inches). And on the 90cm (35 inches) side, we have the shower head.

However, you shouldn’t compare a walk-in shower with an enclosed shower.
In a walk-in shower, the shower area needs to be long enough to prevent water splashing outside the shower space. So, the shower head is automatically positioned on the shorter side. The width you have is 90cm (35 inches).

I don’t know how you usually shower, but I either stand with my back or front facing the shower head.
In my opinion, the space needed is more about having enough room for arm movement. At least, in our old small shower (75 x 80cm / 30 x 31.5 inches), I often bumped my elbows. So, if you stand facing towards or away from the shower head, you mainly need space to the side – which seems to be sufficient with your 90cm (35 inches). I don’t understand why you would definitely need 100cm (39 inches) in the small bathroom, especially since it’s an “emergency shower.” Of course, the bigger the shower, the more comfortable it feels, but that reduces the overall spacious feeling of the bathroom. We have a similar “emergency shower” in the guest restroom, which hasn’t been used even once after one year. However, our child is only two years old and can’t shower alone yet.

Also, positioning the shower head on the short side doesn’t quite make sense to me (unlike in a walk-in shower), especially considering the current arrangement of the sanitary fixtures where a nice enclosed pre-wall installation could be made.
Maybe I’m wrong, and you actually need more space in front — for example, women for shaving their legs or similar.

Perhaps it would help to physically model the shower movements to understand the space requirements better.

Musketier schrieb:
I don’t know how you shower, but I either face away from or towards the showerhead with my back or front.
In my opinion, more space is needed for arm movement. At least, in our small shower (75cm x 80cm (30 inches x 31 inches)) I often bumped my elbows. So, if you stand with your front or back to the showerhead, you mainly need space to the sides, and your 90cm (35 inches) seem sufficient for that. I don’t understand why the small bathroom absolutely requires 100cm (39 inches), especially since it’s an "emergency shower."

That’s a well-explained point!
It seems to me that the space requirements for a shower are generally overestimated. You don’t stand there forever, nor do you usually keep your arms fully extended or bent inside the shower. The built-in space where you move matters, or of course, the free space available.
In this case, I would consider the window a potential hazard. Perhaps a small wall could be built to protect it from moisture?