Floor plan single-family house, 3 children's rooms, goal: save sqm

If you redesign the upper floor, then please remove the bedroom from the south side (assuming the terrace is on the south side) and rather give the children's rooms the nice south side. Bedroom and dressing room to the back, where Child1 and Child2 currently are, children's rooms on the sunny side.

You want to save qms, but the ground floor should remain as it is. Are you then doing a staggered floor? That isn't exactly cheap either and I wonder if you will achieve the desired result with it (namely to be significantly cheaper). In my opinion, the ground floor would also have to be slightly reduced and then the question arises whether the straight staircase can be kept – it really requires a lot of space.

Don't get me wrong: the floor plan is workable, but you mainly want to become a bit smaller.

Before everyone starts tinkering here: please state clearly by how much the overall design has to be smaller and whether a staggered floor is even allowed in the development plan and whether that is what you want.

So roughly Only by hand Staircase turned

We do everything here with the bicycles Therefore, that was kind of my thought.

Where is north?

That one child still lies in the shade, right? For that, bedroom in the south (no one needs a bedroom warmed by the sun).
Also consider where the connections are – it’s cheaper if you limit the plumbing installations to one side of the house if possible.