Floor plan design for a modern new semi-detached house with 6m ceiling height and 239 sqm living area

An example - but better done with gallery

Optics are a matter of opinion. I do not like the house from the outside at all.

You are planning over 200 sqm and a bathroom without daylight? The hallway on the upper floor is bigger than a children's room. If you include a children's bathroom, the hallway upstairs has no daylight. Unless you are vampires, the upper floor is very dark. This is not what one expects given the size and budget. I share the concerns about the effect and acoustics of the open plan area with .

Regarding the ground floor, I think has written everything. Kitchen very dark, the entrance, the arrangement of the rooms. Somehow I have the feeling that you enter the house through a basement.

Are you planning over 200 sqm and a bathroom without daylight?

This could be counteracted by planning skylights/roof windows.

I am somewhat triggered by the extension of the open-plan area, which comes as a split-level. Somehow, it gave me the suggestion of a renovation of an old building with a modern extension that incorporates the open-plan area. However, the whole thing is supposed to be a new build, just with the extension to the neighboring existing building.
I am currently wondering why the utility rooms in the gable-roof house are planned so carelessly, while the open-plan area has to stand out with the 6-meter ceiling height. Why is there such a blunt cut? If the garden, therefore probably at the top of the plan towards the southwest, is there, why is the south side used with shower toilet and technical rooms instead of already placing the kitchen or dining area here, for example? Then, if necessary, use the windowless central wall for the utility rooms (if necessary also a toilet without a window) and put a shed roof on one half of the floor area and perhaps underneath place the children’s rooms with a southern orientation?!

I come back again to the question about the site plan and federal state.

I think skylights are a makeshift solution. You still don't get a view outside.

a bathroom without daylight?

It will be a nice sauna when all five have to shower at the same time... No ventilation system can work that well.
The shower on the ground floor is not a serious replacement.

I think skylights are a last resort. You still can't get a view outside.

Of course they are. But here there is a super long wall where no windows can be placed. The window side belongs to the common rooms. Some rooms have to be located on the fire wall. This is not a single-family house with 4 exterior walls! You simply can't say in general "would be a last resort" when it is simply a solution.