Improvement suggestions single-family house 137 sqm GF with granny flat

Wa19

Now you are completely confusing me: I see a street-side building line both in Fintelmann Street and in Echtermeyer Street, two full floors (not circled, but according to the text mandatory with few exceptions), 9 meters height and no roof form specification (???)

Yes, it is stated in the text

Oh please excuse me, the 115 knee wall was the seller's specification

Oh yes, under local regulations under 2.2: "
In the general residential areas WA 18, WA 19, and WA 20.2, the second floor of the buildings must be constructed with a pitched roof. Pitched roofs must be executed with a minimum slope angle of 35°."

Which provider anyway?
So if we assume here the special Berlin-Brandenburg full floor, and interpret the "II" not as "II+D", but as "II including pitched roof attic", that would indeed relate the roof pitch to the upper floor and not, as usual with "II", to the attic above. But at 9 meters height I definitely do not see the knee wall limited to 115. The "architect" would have to be quite a fool not to get more out of it: we are practically dealing here with a full upper floor that is subject to a pitched roof requirement but still well usable. More is possible, although I still would not see it as an invitation for a separate dressing room.
I’d say "call 4 [USER=27820]@Escroda" – please make a wireframe model of the house volume possible from your point of view

We don't really want to plan everything completely new, since we've already put a lot of effort and hard work into it and are simply running out of ideas.