Can you explain that once more as if I were 5 years old? How much of the garage counts towards the floor area ratio in the planned development and how much does not?
You are allowed to build 0.35 of the residential building including the terrace. In this case, 155 sqm.
As a boundary construction, a garage may additionally be built. It must not have any living spaces.
In this case, I assume that both the simple boundary-built garage and the adjoining house are allowed.
However, the builders want 2 garages, so they sacrifice the area for the house from the 155 sqm since it will be built over.
I haven’t measured everything exactly yet because I don’t like to poke around in piles if it’s not definitely clear that something can be found there. In other words: my time is too valuable for vague interpretations.
And yes: unless otherwise stated in the development plan, up to 50% may be sealed with outbuildings, paths, etc.
In this case, only the boundary-built garage would count, and of course the driveways.