ᐅ Planning a Guest Bathroom in a New Build – What Is the Minimum Size? (Building Standards?)

Created on: 11 Dec 2022 12:59
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T-i-m-m
Hello house building forum,

we are currently planning a semi-detached house. The building plot is very small, and the footprint is accordingly limited. To achieve a reasonably usable living area, we want to keep non-living spaces small and allocate the saved space to the living rooms.

On the ground floor, we are planning a guest toilet without a shower—that is, only a toilet and a washbasin. Recently, I have been carrying a laser measuring device when visiting friends and have measured several guest toilets. Conclusion: 1 meter (3.3 feet) in width and 2 meters (6.6 feet) in length are more than sufficient. In our case, the door would be on the short wall, the toilet opposite the door, and the washbasin on the long wall.

We are currently looking for a builder and have roughly presented our plans. One potential builder mentioned that according to the DIN standard, a guest toilet must be at least 1.24 meters (4 feet) wide.

My online research so far hasn’t been enough to find the relevant regulation or DIN. The DIN 18022 on bathroom planning appears to have been withdrawn without replacement.

Is anyone familiar with this requirement? Is it not allowed to plan a 1 meter (3.3 feet) wide guest toilet in a new build?
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T-i-m-m
11 Dec 2022 15:42
You are absolutely right; this topic definitely allows for more detailed discussion and weighing various factors. The semi-detached house will have a footprint of 8.50 x 7.70m (28 x 25 ft). It will have two full stories plus an attic. During my search for inspiration in the floor plan forum, I didn’t find much. It seems that hardly anyone plans for less than 140m² (1,500 sq ft). I’m considering whether to share the first professionally drawn drafts for discussion in the forum.

The information about the absence of a specific DIN standard for room width is helpful, thank you.

A few notes:
- On the upper floor, there is a kind of broom closet planned with the same dimensions as the guest toilet.
- Our family and close relatives are slim enough to be fine with a narrow bathroom (our current bathroom in the rented apartment, where the toilet is located, is even narrower than 1 meter (3 ft), and I have never noticed this as a problem over the years).
- The house will have three occupants. We intend to maintain a balanced diet for our son so that he does not outgrow the guest toilet space.
- The extra space saved by having a narrower guest toilet could be fully allocated to the living/dining area (where every centimeter really counts).
- There are hardly any other areas where we can save space.
- It would be great to have the door on the long wall of the guest toilet, but that’s not possible.
- Nobody likes tiny washbasins where you have to wash your fingers individually, but I’m sure we can find a compromise between washbasin size and room size.
Y
ypg
11 Dec 2022 16:09
T-i-m-m schrieb:

Upstairs, there is a kind of broom closet planned in the same dimensions as the guest bathroom.

So, the bathroom is located at the top plan and to the left on the plan are two private rooms? There isn’t much space to spread out, that’s true. Do you have a basement?
P.S. You have to clean the toilet too, so you should be able to reach the wall behind it as well.
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Myrna_Loy
11 Dec 2022 16:21
Our plumber said that you should be able to lean forward while seated without hitting the washbasin. Otherwise, there is a risk of bumping your head or getting a cut. Also, the door should open outward so that in an emergency, a person inside the room does not block the door.
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WilderSueden
11 Dec 2022 16:32
T-i-m-m schrieb:

I'm still considering whether to share the first professionally drawn designs for discussion in the forum.
I would recommend that. Even if you ultimately decide to go with the original design, you will have made an informed decision and be aware of the disadvantages. Not just because the architect suggested it and, as a layperson, you might not see the downsides.

Regarding your sketch... with the toilet shifted, you’ll need a wider bathroom so your right hand doesn’t constantly hit the wall. I would place the sink closer to the door and move the toilet to the center. A small sink is sufficient for a bathroom, no problem.
For small houses, it’s especially worth considering a basement because it can free up space on the ground floor, for example for the utility room. You can also reduce storage space in the kitchen, etc.
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xMisterDx
11 Dec 2022 16:36
I assume that the combination of a small plot with a semi-detached house and a small building envelope was chosen not to create a challenge but for financial reasons.
Building a basement in this situation... well.
Y
ypg
11 Dec 2022 17:05
xMisterDx schrieb:

I'm just guessing,
I'm not, because here it says, look:
T-i-m-m schrieb:

we are currently planning a semi-detached house. The building envelope is very small
You don’t get to choose the building envelope deliberately. Better to ask than to guess 😉