Single-family house with a 75 sqm granny flat

Well then you probably overlooked these?:

And these

Why do you need a mega bedroom with a mega walk-in closet?

and these

Do you also have elevations?

and these

Do you have that in writing?

and these

And 12° is good for photovoltaics?

It would be important for us to have the living-dining area and the granny flat on the ground floor

Why?

I would consider separating the house and garage.

The development plan does not allow that.

ok then just garage at or in the house

I do not see a monopitch roof at all, but rather a ridge direction specification in the development plan excerpt at the head of the thread.

In an "estimated" building envelope, I would not "plan" anything at all.

The development plan does not allow that.

Probably not the plot, but the development plan?
Although I do not see a "better" place for the parking spaces here either, as they are already positioned "badly enough" as planned.

I wouldn't "plan" anything in an "estimated" building window.

Would I estimate in my plan?

Probably not the property, but the development plan?

Sorry, don't understand you. Here's some info; there isn't much from the OP anyway. [ATTACH alt="BPlan_St.png" type="full"]39165[/ATTACH] There are height restrictions too. I haven't found the "side plan." And you can't just dig anywhere either Want more?

Sorry, I don't understand you. Here's the info; the OP hasn't provided much.

Your detective ambition is probably even greater than mine I meant that uncovered parking spaces could definitely also be "free-standing" - unfortunately, a garage can only be placed at the planned location here, i.e. with this driveway position practically only as a bucket directly under the hole so it is already factually not variable, which makes the search for "legal" alternatives obsolete.

Played around a bit. Two-family house, buried 1m in the east. Bottom of the plan is north. Whether the stairs on the upper floor work like this, would need to be checked again - but theoretically yes.

No basement - instead attic. Knee wall 0 / 45° gable roof.