Floor plan for a single-family house with a basement on a hillside

So, one of us two still doesn't really understand the heights. If you want the terrace behind the house and additionally on the garage, which terrace door do you want to use to enter the rear one? From the attic? Or do you want to dig away the hill behind the house and sit in a huge hole?
I sketched this once:
Assuming you put the garage in the basement and align the height to street level, then the basement would be completely buried in the hill. On top of that the ground floor, which would still be more than half inside the hill. A terrace at the back would then rather be accessible from the attic. (Note! These are just sketches to get a feeling for the slope)

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Of course, you don’t necessarily have to align the driveway to street level. A car can also handle some height. But that is more a matter of centimeters than meters. (Maybe one of the car enthusiasts knows what slope a car can overcome at most without scraping?)

Please correct me if I am misreading the slope. I see a difference in height of 7m across the property. Can you take a look at this? You have experience reading "slopes".

How did the neighbors build? Do they also have 2 terraces behind and next to the house?

You should still have a maximum of 2 or 3 meters backwards.

May I ask which program you used to model it?

The car overcomes 80 cm over 5 m. I believe that is already close to the maximum. The ground floor is exactly at the rear (southern) terrain level. The depth of the south terrace must accordingly be completely excavated and the mountain retained. Well, that sounds plausible to me except for the budget.

So far, we have a few initial drafts from other providers. One draft that we actually liked is attached. However, because of the second bathroom, everything is a bit tight in the attic. We would probably adjust that there.

Of course. We thought that should be possible here. Access past the house, past the front door into the garden. In all the other drafts so far, the front door was in the basement on the eaves side. You would then always have to take the stairs from the basement to the ground floor to get to the garden.
The terrace above the garage is just additional. The main terrace faces south, so behind the house.

What does that mean? I thought you always had to leave a 3m distance to the neighboring property if you do not have an exemption permit.

Yes, that was always implemented that way in the other plans, too. We are still not sure what makes more sense for us.

Yes, that’s a good point. We currently assume that we will mostly enter through the garage. But we need to reconsider that.

I agree. That wasn’t on our radar so far. Thanks.

Regarding the price: So far, it has only been communicated verbally. But we know from the general contractor a similar house that was built for this price.

Definition of knee wall is attached. In the development plan it says WA + I + o