Arrangement house and parking spaces - small plot - house with a granny flat

And where are the parents supposed to go or the granny flat? I suspect that you have simply fallen in love with this roof terrace.

Oh, so the draftsman from the construction company is supposed to use a magic wand when copying the model house, so that a magical door to the world of the granny flat opens in a wall cupboard?

That will never fit on the property.

Exactly .. that's why it's just an orientation of how much space what takes ;)

What exactly is stated about the maximum ridge height in the development plan?

Are you even allowed to build that much? Some development plans explicitly exclude exceeding the permissible floor space index, then you may only build up to 40% at most, with parking spaces and paths counted as 50%, maybe 50-60%. That is quickly reached...