Build a terraced end house with an additional unit (GÜ) on your own

Even if the money were available for the expansion, you don’t have space on the property for the slope/light well.

I don’t understand that now. You don’t need to excavate for a light well on the garden side. We are 1.50 m below finished floor on the ground floor and have to go 2.40 m deep for the foundation.

I don't understand that now. On the garden side, you don't need to excavate for a light well. We are 1.50m below the finished floor level on the ground floor and have to go 2.40m deep for the foundation.

You mean the basement would stick out? To the extent that in at least one room in the basement there remains a maximum parapet of 80/90 cm? So that the terrace would have to be filled up?

(Ps: it may be that I only skimmed one or two pages here)

You mean the basement would be visible? To the extent that in at least one room in the basement there remains a maximum parapet of 80/90 cm? So that the terrace would have to be filled up?

Yep, that's why the fuss about the basement. The access road is 1.50m above the original terrain.

I’m just wondering, by the way, how the parking spaces are supposed to look then...

My proposal of the almost cloned ground floor layout may seem simple, but it is nevertheless well thought out. In terms of statics, I see no problem there – what is good enough to support the ceiling on the ground floor will also do so in the basement. For a basement of the "must-have" kind, I clearly consider a storage room that is gladly even visibly "cheap" exactly the right use. The property does not provide space for a cozy slope, so I consider any measure for a habitable basement (with emergency exit and view windows, of course) a Pyrrhic victory in view of the, in my opinion, certainly unfounded hope of being able to save rooms elsewhere by relocating them there – at least as far as the economic effect is concerned. I therefore did not address this option because it was clear to me within a hundredth of a second to reject it. And: in my opinion, it is certainly a basement for a basement builder – not for someone who conjures up anything else from concrete besides a "basement" in a civilian profession.

Yep, that's why the fuss about the basement. The access road is 1.50m above the original terrain.

That doesn't mean you can't still bury the basement 80 cm. I would also avoid a basement that sticks out a full meter. There isn't even enough space for a stair landing, and a terrace with a slope also takes up space.

Better to have a light well that is big enough to include a seating area. My neighbors had that in their single-family house: the light well provided a living space in the basement and a cozy seating area by the house (yes, exactly, by the window on built-in benches).
You could do that nicely for the children in the west corner.