Design for a single-family house with 160-180 sqm - suggestions for improvement?

Stairs to the upper floor via the stairs from the basement, for that the upper floor has to be re-planned:

Bathroom + dressing room + bedroom to the north, the living areas to the south, done. Planning stairs not on top of each other is probably the biggest, most useless waste of space there is. If you build 300m², you can do something like that, but here?

I am not planning anything now because the bottleneck is the staircase anyway. My personal opinion on the current floor plan:

- The living room is too narrow at about 3.10m to 3.20m. It will be a long corridor. Nothing more, nothing less.
- The entrance to the living room can be a bit more "massive." Here I am thinking of a frosted glass sliding door, but not with the dimensions of 0.885m.
- What is the second toilet on the ground floor for? Are you planning with an au pair?
- The kitchen is approximately 2x4m, your ground floor bathroom is almost the same size.
- The shifted staircase simply eats up a huge amount of space that you just don’t have. The living room and kitchen are therefore simply too small for a floor area of over 200sqm!
- I understand that the dressing room or something similar is supposed to be in the north, but a dressing room without direct access to the bedroom is, to put it mildly, nonsense times ten (if you have the space). Then separate the bedroom from the staircase and make it smaller with direct access to the bathroom (move the bed to the window first).
- The position of the rooms relative to the cardinal directions is good but not your actual problem (-> it is still the staircase).
- What else I noticed!!!! The window dimensions are not rough opening dimensions, they are too unusual for that. I don’t know it that way. In my case, the rough opening dimensions of the windows are in the planning input. Just don’t let the rough builder take this as is (if this dimension is carried through all plans), then you will get mini windows :-p

That definitely helps already. Unfortunately, I can't upload the dimensions because the files are allegedly too large. The living room should currently have a width of 3.80m. Is this also too much of a narrow space? Sliding door living room is a good point. Overall, we had considered widening it by up to 1m in order to make the bathroom on the upper floor and the kitchen, etc., wider. On the ground floor, there should not be a second WC but rather the whole room should replace the wardrobe – which is actually not needed; there should be space for jackets etc. in the hallway. This would create a kink at the top of the living room. No idea if that makes sense.

Even bigger
You still have a room left upstairs, don’t you, or is it planned for a child after all?

For 2 or 3 people, more can be made out of the size.

Why is the conveniently planned cloakroom on the ground floor turned into a second toilet?

The floor area of this size is so common that you can find countless floor plans for it in every house-building catalog. It’s best to visit a model home park to get a live impression and better classify the floor plans.

The kitchen is also carelessly thrown in at this spot. A corner staircase (& basement ground floor upper floor - stacked) would also save a lot of space.

Corner stairs or something similar never really appealed to us - I find it easier to have a straight staircase to walk on. But if the two staircases are on top of each other, you probably have a problem separating the temperature between the ground floor and the basement? The basement wouldn’t actually be heated or insulated.