Single-family house 143 sqm - the perfect planning?

Right, thanks for the hint

I don’t find the living room cramped; whether the fireplace actually comes in at the corner, no idea, but I like the spot because it’s visible from all sides. What sizes do your living rooms have? In the Rhein-Main area, at least they usually have more than 40 for kitchen, living, and dining; we have 40 in the apartment and it is by no means cramped. I’m a bit surprised

About the children's room: we both grew up like that. Here in the Rhein-Main area every square meter really costs a lot. But let’s ask the architect at the meeting. Children are very much welcome

Take a close look at your upper floor floor plan:
The 318 cm is not the interior dimension on the plan right, it’s probably a max of 297 cm. Try putting beds in the rooms and at least 100 to 150 cm of closet and then try to fit a desk as well.

Requirements:
open, airy construction, modern and rather minimalist, with corners for relaxing, no suspended ceilings upstairs in the attic

Did you both grow up SO? I doubt that

As for the children's room: We both grew up like that. Here in the Rhine-Main area, every square meter really costs a lot. But let's ask the architect at the meeting. Children are very welcome

Yes, I understand if you have to plan tightly. But you are not planning tightly, there is still the basement, on the ground floor preferably everything very airy and spacious, bathroom even bigger and the balcony definitely for the parents – it’s hard to believe that two children are gladly planned for

Regarding the room size, both have slept with siblings in the room. I got the hint, thanks. Since we currently don’t have one yet and maybe only one is possible, we think it’s enough...

The drawn children's rooms are not really usable. You don't have a proper option to place a 60cm deep wardrobe in any children's room. In variant 1, access to the children's rooms is also not feasible.

And even in the Rhein-Main area, there will hardly be such large houses that only have such small rooms. Small children's rooms are tolerable and common if the entire house is small. But 143m2 is not small and nice rooms should be possible. So they should be at least 12m2.

If you only want 1 child, then just leave the plan as it is. And if a 2nd one comes, then one of you can simply sleep on the ground floor or you can make a nice room in the basement that can also be used as a children's room. Do you have the basement plan?

Yes, we'll see. Our idea was otherwise to later make the room on the ground floor the study into their living room (and possibly accommodate guests there) and everyone has a small children's room.

Here is the plan of the basement as proposed by the developer.

What do you think of the bathroom?

There isn’t really any news yet, but I have a fundamental question: Is it possible to plan the kitchen on the ground floor via the utility room (basement) and thus no longer have the bathroom (upper floor) directly above the kitchen? I’m wondering if that might cause any difficulties regarding water supply/sewage pipes...