Is a garage interior depth of 570 cm sufficient for future cars?

Exciting, then I had different models so far

It was similar there: Audi 80 with a standing lower part, with the A4 it works with raised; likewise with Rekord E vs. Omega ...

then the architect came along with the floor area ratio and asked where the staircase to the rooftop terrace (on the garage) is, which also has to be included in the floor area ratio.

Why should a terrace on a garage count again as built-up land area? - maybe you should better present the whole house, if I interpret your words correctly, everything is still salvageable. Regarding the terrace on the garage, also consider that the terrace is not privileged by boundary law.

Presumably only sedans..

Why should a terrace on top of a garage count again as built-up land area?

Because the garage cannot be greened. For example.

However, it is planned to green the garage. The staircase counts towards the floor area ratio and not the roof terrace as additional space. That means the space that the staircase now occupies is the recess in the garage.

Is the roof terrace not accessible from the house or what is the staircase for?

Is the roof terrace not accessible from the house or what is the staircase for?

Exactly. The garage is separate from the house.

Does the garage have at least 3m [Grenzabstand]. If not, then nothing will come of a roof terrace.