Semi-detached house in building area 8.5m x 15m (WxD)

Good morning everyone,
based on your questions, I got to work – with the result that I have to correct some information.
The building envelope does not start 3 meters from the street, but 6 meters from there – and then extends another 15 meters in depth.
The height difference of the natural terrain is not 2.2m, but only 1.8m, as the re-measurement in the geodata portal showed (see attachment).
From the same source, I also made a better drawing of the property and dimensioned it accordingly (see attachment).

You can’t expect two families to block each other with their cars, and that this is supposed to work. And where are supposed to be four parking spaces? You can’t just line up four parking spaces one behind the other.

I apparently expressed myself unclearly. At the neighboring house on the left, you can see how it looks. In each setback area (left and right) there is a garage (one parking space per side) with an access driveway in front (one more parking space per side). This creates 4 parking spaces.

After the 15 meter building envelope, you are allowed to have a 1.5 meter built-over terrace

Only AFTER the 15 meters? Or also before, meaning in the 6 meters between the street and the house?

The top edge of the finished ground floor floor

So the ground floor? Does that automatically mean that the first full floor is at the latest 60 cm above street level, even if over its depth on average less than 1.4 meters protrudes above the terrain profile?

Thank you for the plan with the construction site. I have inserted the area according to your specifications. This can work. Who will get the garden plot? Should it be physically divided with a right of way? I have drawn it with 2.2 m for now.

At the neighboring house to the left you can see how it looks. In each setback area (left and right) there is a garage (one parking space per side) with a driveway in front (one more parking space per side). This creates 4 parking spaces.

But one must also realize that this means the garden access for larger gardening work is not free and can only take place through the garage or through the house.

Who gets the garden plot? Is it supposed to be really divided with a right of way?

I have drawn it with 2.2 m.

I think the slope from the street over the first 6 meters should not necessarily be retained as a slope.

I think the slope from the street over the first 6 meters should not necessarily be maintained as a slope.

The OP posted an elevation plan while I was sketching, where the first 6 meters are rather flat.

One must also be clear that this means that garden access for larger gardening work is not free and can only take place through the garage or through the house.

Unfortunately, it could no longer be changed ... it is very difficult anyway due to the slope.

The OP uploaded an elevation plan during the time I was sketching, where the first 6 m are rather flat.

I know, but it's still a good 40 cm ... and it is not yet clarified how terraces can be distributed at all in such a solution.