Dream house floor plan - 173m² with 3 children's rooms

What is behind the door in the technical room? The electrical distribution? If so, that would be a no-go for me.

I would skip the door to the garage, because if a car is parked there, it will be fun to get past it and your technical room would have a wall/surface where you can attach something.

die Räder kommen, wenn überhaupt nur dann zum Einsatz, wenn uns die Kinder zwingen.

Well then, have fun maneuvering the car.

I don't think the draft is bad – except for the small details that others have also mentioned. But I would think very, very carefully and for a long time about the swinging door to the kitchen with three children.

Otherwise, I think it's good ... no floor-to-ceiling windows on the upper floor, and I also find the basic room layout appropriate.

For me, however, a balcony door already counts as floor-to-ceiling.

In the front view, one should not replace the missing window with a drying rack.

Otherwise, quite a lot has already been said.

I am in favor of the entrance from the garage. I have it myself. You just need to drive the car a little further forward, then you can carry the boxes directly from the trunk into the kitchen.

The bathroom with the T is not a good solution.

A balcony door counts as floor-to-ceiling for me.

I was imprecise. Upstairs in the living rooms, nothing should be floor-to-ceiling. The door behind the toilet will of course also be frosted and allows access to the garage roof.

Ok - so the construction costs are clearly above €3,000/sqm. Because the floor slab (including foundation, insulation underneath, etc.) is part of the construction costs (cost groups 300/400). What is the price including the floor slab? And really based on living area, not on footprint.
It should then fit into the "normal" price range.

For the appropriately insulated floor slab, we have offers around €30k. So that adds between €150/200 per square meter more.