Floor plan optimization of a single-family house with a basement on a small plot

Here are the neighbors, as Aunt Google sees them: [ATTACH alt="grundrissoptimierung-efh-mit-Keller-auf-kleinem-Grundstück-347015-1.png"]38268[/ATTACH]

Wow! Quite some big ones next door.

Don't the usual 2/3 rules not apply to the second floor?

Yes, sorry, my "no" was probably a bit too categorical. You obviously have to calculate exactly. With a knee wall height of 1.80 m, avoid the full floor - it's possible with a shallow roof pitch, but in my opinion it creates strange ceiling heights.

I throw the floor plan of Marlow SH 160 XXL into the ring. It is somewhat longer, but has a gable roof, no basement, no tower, all rooms included

Yes, sorry, my "No" was probably a bit too categorical. Of course, you have to calculate it precisely. With a knee wall height of 1.80 meters, avoiding a full story is possible—with a shallow roof pitch—but in my opinion, it creates strange ceiling heights.

Doesn't the setback story count as such?

I throw the floor plan of Marlow SH 160 XXL into the room. It is a bit longer, but with a gable roof, no basement, no tower, all rooms included

The width is a problem, if you ask me. At almost 13m, the building plot is completely used up (it should be about 19m wide). That means the terrace is already considered edge development.

If the parking space issue has been resolved according to the plan and deemed permissible, I consider this approach worth considering:

[ATTACH alt="grundrissoptimierung-efh-mit-Keller-auf-kleinem-Grundstück-347048-1.jpg" type="full"]38269[/ATTACH]

We had something similar before with the design:

[ATTACH alt="EG-2Etagen.jpg" type="full"]38270[/ATTACH]
[ATTACH alt="OG-2Etagen.jpg" type="full"]38271[/ATTACH]
Here, however, with a double garage, which will of course be omitted. The attic as a development reserve was also planned. I don't think so at the moment.