Floor plan of a single-family house approx. 170 m² on a narrow 750 m² plot

??? Do you know what a gable roof and a hip roof have in common?
It seems you are standing in your own way again with your false assumptions ;)

Here: eave sides are the same for hip roof and/or gable roof

Of course that's possible. You are allowed two stories, right? But even with a knee wall of 2 m, that works very well.

Do you want to exploit the roof pitch?

Do you want to use an additional attic storey or convert it later?

It is true that hip roofs and gable roofs can have the same dimensions at the eaves side. When I think of a hip roof, I always imagine this townhouse-style roof...

I think we only want to use the attic as storage, not for finishing it. Let's see how it looks visually on the drawing when the roof is raised accordingly.

Then a real two-story building and a roof with a 25-degree pitch are also possible. Here is a change. [ATTACH alt="Grundrisse 21.jpg"]58994[/ATTACH]

I always have this city villa roof in mind when it comes to the hip roof... [...] I think we only want to use the attic as storage, not for conversion. Let's see how it looks visually on the drawing when the roof is raised accordingly.