Floor plan single-family house, 1.5 floors, 2 children's rooms, 2 offices - is area usage optimal?

Through the niche, you are taking up your floor space, because you also have to be able to access the niche in the kitchen. I strongly recommend actually planning this kitchen space.
And also the furnishing of living / dining with walking paths to the terrace from the kitchen.

The idea as always is to swap living/cooking, which also creates a quieter corner. As the hallway is currently, it might be narrower too, but it’s not easy to judge because intermediate dimensions are missing in the floor plan.

We have an appointment with the kitchen planner on Friday. Exactly to either bury or finally decide on the points kitchen niche as well as kitchen door vs. floor space.

True, the hallway could be narrower. Honestly, the hallway is only wider so that it benefits the living room wall in the north. Mhm. Do you have any ideas to improve that?

Swapping kitchen/living is the classic. However, that is not an option for us because we want to enjoy the view facing south from the living room and don’t want the kitchen to be so dominant/central.

The building mass is, in my opinion, also unfortunately placed so that the garden is maximally chopped up. I would go more in width instead of depth.

Definitely. If the street in the north is not a highway, then place the house right up to the 3m minimum distance. You can't use that area for anything at all. And whether the guest looks at that street from their room or on the toilet... who cares? ;)

A wide piece in the west can also be very charming. I wouldn't change that. Put the house in the north right up to the building boundary, then the garden in the south will be large enough.

do not want the kitchen to be so dominant/central

Then push it against the house wall and take the dining area as the dominant meeting point.

since we want to enjoy the view to the south from the living room

Because if you are sitting on the couch, it is already too dark for a view ;)

Sorry, it's not about what has advantages if you don't even have the option. Check again: what is allowed? Does it say an l or a ll?

In the development plan (text part, graphic part) I haven't found any information about that. To me, it seems that only the height restrictions must be observed.

Switching kitchen/living room is the classic. However, that is not an option for us, as we want to enjoy the view to the south from the living room.

Because when you're sitting on the couch, it's already too dark for a view ;)

And cleverly, the couch is not even drawn in .. I suspect with its back to the lower window of the plan, because there has to be some reason for it

That's right, the hallway could be narrower. Honestly, the hallway is only wider so that it benefits the living room wall in the north.

... I could imagine the wall unit is there.

I just checked the development plan: Max. eaves height 5.80 Max. ridge height: 9.00 (both from BZH). If my mathematical knowledge is not completely lost, we still have plenty of room with the gable width up to 9.00m.

What are BZH and mbH?

I can't completely dismiss the suspicion of a "floor plan from the drawer"... Although that doesn't necessarily have to be a bad thing – especially since we don't have any extravagant wishes.

That depends on what the deviations from the drawer design are. Basically, catalog houses / standard house types are advantageous insofar as maturity arises through the "series" (and, for example, the statics can also be used multiple times).