ᐅ Bathroom Planning: A Guide to Decision-Making

As part of our house planning, we are still figuring out how to arrange the main bathroom on the upper floor. The sloped roof with a pitch of 42 degrees and a knee wall height of 1.43 m (4 ft 8 in) on the inside faces north and includes a skylight. We need the asymmetrical hexagonal bathtub because it slopes gently on one side (which we want). So far, we have not been able to find a symmetrical hexagonal tub that offers a gently sloping side. Currently, we are considering the following options:

Option 1:

• Suggestion from our bathroom/plumbing studio
• Advantages: relatively open and well-lit bathroom with a usable niche (for laundry basket, built-in shelves) in the northwest behind the shower
• Disadvantage: narrow access to the niche

Option 2:

• Like option 1 but with the tub rotated
• Advantage: better access to the niche
• Disadvantage: the floor-to-ceiling window would need to be moved because the tub is too close to the window

Option 3:

• Advantages: open floor plan, tub placed in the niche (which we like)
• Disadvantage: Would this feel too dark or cramped at the washbasin area because of the shower wall and despite the skylight behind it?

Option 4:

• Like option 2 but with the toilet rotated (now located under the sloped roof)

Which option do you like best? I would appreciate your opinions, advice, and possibly other suggestions.

For me, all five options are ruled out because, in my opinion, the washbasin is placed too close to the door, so that people staying there (which is naturally the spot where you tend to stand for a long time) will be in the way.

Your niche would simply be a dust collector that should be avoided.
I don’t understand your asymmetrical bathtub situation: why do you want such a bathtub if it possibly doesn’t even exist? And if it does, it will be very expensive. By the way, most bathtubs have a gently sloping side; this is called ergonomics.
Take a simple rectangular single-person bathtub that is large enough for two and place it with appropriate platforms exactly how you want it. Otherwise, there is an expensive space-saving bathtub from Kaldewei, a 90 x 160cm (36 x 63 inches) corner bathtub with an oval interior, which looks like an egg from above— I had it myself, but it is not quite satisfactory for two people.
A floor-to-ceiling window is also not very practical for good room layout since you cannot place anything in front of it.
To what extent are the windows and door adjustable?

As shown in the "Bathroom Floor Plan" image, the door can still be moved about 20cm (8 inches) to the left and nearly 60cm (24 inches) to the right. Unfortunately, there is even less flexibility with the window. We want it to be floor-to-ceiling to maximize natural light (the bathroom faces east – receiving the morning sun), and the exterior appearance allows hardly any changes or we like it as planned (see exterior view).

We are also not very happy with the designs. We have already pre-selected the asymmetrical bathtub (without signing anything yet) and were prepared to accept the high cost. As mentioned before, we would prefer a symmetrical hexagonal bathtub, but it seems this is not available with ergonomic design. A straight bathtub (e.g., 180 x 80cm (71 x 31 inches)) would also fully meet our needs, even preferred over a corner tub. Unfortunately, the only options we came up with were variants 3 and 4. Are there any other ideas on how to move the washbasin away from directly in front of the door?

You can simply install a regular bathtub at an angle. It doesn’t cost nearly as much as one of those custom designs.

Chest-high windows that are wider and double-winged let more light into the room than those narrow floor-to-ceiling ones...

Move the door as far up or to the left as possible. Try to place the shower in the bottom left corner. The door into the room should then open to the right. The shower will basically be behind the door. Place the washbasin next to the window. Position the bathtub in the top right corner, arranged diagonally. The toilet should go on the left wall. You can also add a partition wall here if you want. That’s what I would try.

I like option 5 best. The only drawback is that you have to pass by the shower first.
We will probably install the asymmetrical bathtub as well. It’s "only" twice as expensive as a regular bathtub. But the space gain is really significant. Plus, you can position it quite differently than a standard bathtub.
What software are you using to plan the bathroom?