Single-family house with a ground-level granny flat on a slope

Keyword: just digging out an additional one hundred and twenty cubic meters of slope for this room alone also costs a pretty penny,

The earthworks are just peanuts compared to that.

As already mentioned in post #84: 2 levels would be great, downstairs the parents' ground floor with 80m2, next to it parking spaces with 50m2. On top of that, shifted along the slope to the back, our attic floor with 130m2. Access to the parents' area via the garage in the east, access to the attic floor via a few stairs in the north.

The question now is whether I have to fully basement the ground floor. I would really like to avoid a 3rd level.

Do you want 3
take the granny flat to the 1st level
that eliminates about the area of the roof terrace

Unfortunately, that is not an option according to the OP.

Unfortunately, that is not an option, according to the OP.

I'm going to push it through anyway

As already mentioned in post #84: 2 levels would be great, below the ground floor of the parents 80m2, next to it parking spaces 50m2. On top of that, shifted along the slope to the back, our attic floor with 130m2. Access for the parents through the garage in the east, access to the attic floor via a few stairs in the north.

The question now is whether I have to fully basement the ground floor. I would really like to avoid a 3rd level.

Have a look at post #118. It works with 2 levels. No basement but a residential lower ground floor.

How urgent is it for you?

The earthworks are just peanuts.

Well, sometimes also peanuts in Kopper's sense ;-)