New single-family house in southern Germany

And both offices upstairs, but the child's room a bit smaller and more space downstairs in the common room

And upstairs both workrooms, but the child's room a bit smaller, and more space downstairs in the open-plan area

Yep, good idea.

The experiences in the Allraum also have a 1-10sqm play corner in the first years, the child wants to be there too

maybe it helps you to see the all-purpose room as the family room and all children's and work/guest rooms are for retreat and therefore not necessarily very large. 90% of daily activities take place in the all-purpose room, living, cooking, playing, eating (even with 15 guests), extended in summer by the terrace. When we thought this through, we were able to better assign the room sizes

That is the big question that we find difficult to answer. Currently, everything ends up in the living room because the only alternative is basically the bedroom. It may be that everything shifts to the other rooms (especially the playing child with/without friends), but it can also be the other way around. Sacrificing everything to the all-purpose room and banishing the other rooms upstairs results in only this option working. The rooms then created upstairs are very small (~10 sqm) and with the half-story, a dormer is actually mandatory to provide sufficient natural light to the room in the middle. We briefly discussed the Flair 134 as a floor plan at Town & Country, which corresponds to the concept. But we preferred the approach with proper rooms upstairs and then took the Bodensee 129 as another basis. In the end, I don't really find 37 sqm for the all-purpose room small. That would give a kitchen of ~11 sqm and living/dining of 25 sqm. If I compare that to the 19 sqm the living/dining room currently has and remove things like the desk and think in a larger sofa, then it should work.

our experiences with practical room sizes are
office/guest 10-12sqm,
child 10 small, 15 large, bigger never manages to clean up,
sleeping 15sqm, with wardrobe and yoga area, dressing room fashion trend only necessary for shift work.
kitchen 10sqm
dining/living/play corner 30-40sqm.
our children and grandchildren spread Duplo, books, cars, dolls, farm on 5-10sqm

We used to have that size for living/dining.

The three of us were bursting at the seams.

Draw in living, table for more than 3 people, play area.

We wouldn’t manage with that anymore. I never would have thought that. A lot has changed this year. For us, the open space is the center of life. Play, hobbies, work, eating, meeting place.