Floor plan of an efficient house on a slope 10 x 10 m

Good evening,

I am planning a house in the style "Quadratisch Praktisch Gut" with the dimensions 10 by 10 meters on a slope. The entrance from the street is on the ground floor, and access to the garden is on the basement level. It is an old development plan with few requirements. The plot has been acquired, and a soil survey certifies a two-story construction. For three stories, soil replacement must be carried out for higher loads.
At the moment, I am in the preliminary planning stage, still without an architect or structural engineer on board.
I would be interested in your opinions on this floor plan.

The key data are:
Plot size: 660 m²
Building gap on a slope
Length along the street: 21 m
Site occupancy index 0.4
Floor area ratio 0.8
Roof pitch 20 - 35°
Open construction style
Garage 8 m on the boundary possible

The living and guest area is to be located on the ground floor, the sleeping and working area in the basement.
Efficiency and renewable energies in the house are very important to me. Therefore, the roof design should offer as much area as possible for photovoltaic panels facing south.
Due to a high proportion of home office, the study is designed to be somewhat larger. Children's rooms are not planned, guests possibly 2 to 3 times a year. A possible access to the garden from the ground floor is still open. I look forward to your suggestions and ideas.

I am planning a house in the style "Square Practical Good" with the dimensions 10 by 10 meters on a slope.

Actually quite the opposite.

Still open is a possible access to the garden from the ground floor.

Sloping plot facing south, key data: no children? Please fill out the questionnaire. Thanks.

Otherwise: predestined for sleeping area / office area on the ground floor, living area / kitchen area with outside access and opening of the living space into the garden in the basement.

Garage 8 m on the boundary possible

Garage is usually OK but with a workshop underneath? What has the neighbor built on the property boundary next to the garage? Is one parking space sufficient? For the garage door, I would opt for a wider one, otherwise you always have to pass the corner of the car with your wheels. A bedroom of about 3 m would be too narrow for me. 45-50 cm next to the bed remind me of mobile homes from vacation. I would swap the dining table and the couch. Overall, I would place the living area in the basement because of direct garden access. Sleeping area upstairs. You can tell no professional was involved. If you go to a planner, please don’t show them your draft. They should be creative themselves!

Completely without information about the property (heights) and surroundings, nothing can be said here. Pictures of the property are also quite helpful. Why is the garage inside the thermal envelope? Where is north?

Where is north?

"In front," ground floor, see photo.

Why is the garage within the thermal envelope?

Probably because he didn't think much when drawing the walls. He is an amateur and says he has not involved a professional yet. Just take it "only" as a sketch!

Slope property facing south

I have already read that. But where did you get the information from?