Floor plan of a single-family house on a slope with a basement

It should be a 1/4 turn winder. 2 equal legs.

No, look at the basement and ground floor below.

Where is north?

In which direction does the slope go?

Is the property serviced? Where are the connections located?

Do you already own the property?

Is it building land?

Where is north? In which direction is the slope going? Is the property developed? Where are the connections located? Do you already own the property? Is it building land?

North is marked in the upper left corner of the respective screenshots. The location map is oriented north. The slope goes from right (highest point) to left (lowest point). The property is fully developed. Connections are on the site plan where the blue arrow points to. (fresh water, sewage, electricity, and fiber optic) Yes, the property belongs to us. Yes, it is building land. The development plan has no restrictions except for a maximum building height of 12m and a maximum buildable area of 500 sqm. For the stairs, I have marked the direction of travel again. Hope this makes it clearer.

Can you say something more about the planned material for the walls?

That is a 12-15% slope, presumably towards the west if north is at the top of the site plan. In my opinion, the main challenge here is first the location and orientation. A good architect is needed here rather than a DIY approach or a planner from the developer. Given the budget, I would not make compromises on that. Your location of the buildings is, in my opinion, rather suboptimal. It is also important to know how the development in the surrounding area is planned. There seems to be a development plan. Where can it be found? Please do not insert a link here. That is prohibited according to forum rules. Just say what it is called, and we will find it.

I fear that the staircase from the ground floor to the upper floor restricts the headroom of the staircase from the basement to the ground floor. Since the second flight of the ground floor to upper floor staircase crosses the second flight of the basement to ground floor staircase.