New single-family house on sloping plot

We are building on a very similar slope. Your basement could be perfectly used for bedrooms. Lighting is not a problem. Maybe you could also dig out sideways to get light into the basement from two sides. So I ask, why does it have to be 3 stories? I would enlarge the footprint and omit the attic. Then better utilize the basement and put the children's rooms down there. Take the garage out of the thermal envelope and place it next to the house. You can still make the roof terrace on the garage as planned. Since the footprint becomes larger, another room could be added to the living floor, which would become the dining room. Then you could live on one level in old age. The wardrobe of course belongs in the basement. Overall, the square meter count could definitely decrease with this arrangement.

We are building on a very similar slope.

Took the original draft, replaced the stairs and swapped the kitchen. Exterior dimensions are 11.4 x 9.9m - rotated the whole thing. Outdoor stairs with a second entrance for the mail carrier and visitors I find nicer - but you can also omit it. Depth of the open space lets sunlight into the house.

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The roof orientation doesn’t work like that. It is predetermined.