Single-family house floor plan, feedback

First of all, thanks to everyone for the feedback. I will address the issue of single-story design at the next appointment with the planner and regarding the budget, I will wait until we have concrete offers.

I would still appreciate concrete suggestions for improving the floor plan. For example, how can I get fewer sqm of hallway to have correspondingly more sqm for the children's rooms?!

How can I get, for example, fewer sqm hallway in order to have correspondingly more sqm for the children's rooms?!

Floor plans completely new, and if the ground floor has to be so much bigger than the upper floor, then consider placing 1 children's room and the office on the ground floor or also the master bedroom on the ground floor and for that 3 children's rooms and office on the upper floor. But that requires a completely new room concept, which cannot be achieved by shifting 2 walls. EDIT: And maybe provide a site plan with surroundings. Explain why so many bay windows, clinker brickwork certainly because of "north German" etc. - right?

So,
In theory, of course, you can swap the office and the kitchen. But it will involve many adjustments. The central hallway can be halved. But I find the staircase right in the entrance very misplaced in the dirty area. Also, the showers, which boast windows, are not well thought out.
The hallway upstairs has more corners than I can count.
Upstairs, you could eliminate the utility room, giving the two children's rooms a bit more space.
But ultimately, a new design is unavoidable.
A few months ago, I had to redesign a similar plan – it’s just a small (additional) request to a hastily created design that turns everything in the plan upside down, which involves a lot of work.
If you want the room swap, then give a new design a chance.
P.s. You can’t really say anything definitive with vague information and no site plan anyway. And in Lower Saxony, the 3/4 rule without structural ancillary facilities still counts towards the full floor area.

No, so far only the calculation. We will only obtain offers once we are (almost) finished and satisfied with the floor plan.

Oh? – I would have taken the shown plans for those of such a general contractor’s drafting apprentice.

First of all, thanks to everyone for the feedback. I will address the issue of single-story design at the next appointment with the planner, and regarding the budget topic, I will wait until we have concrete offers.

Unfortunately, I do believe in the computational single-story design here, and I consider such contortions ...

you mean all the increasingly expensive corners on the ground floor, which then all require flat roofs,

... not a wise approach.

I would nevertheless appreciate concrete suggestions for improvements to the floor plan. For example, how do I get fewer square meters of hallway to have correspondingly more square meters for the children’s rooms?!

You precisely need the extra chubby square meters on the ground floor to achieve the single-story design through the “legal route” of the inflated reference story. To me, the planning here seems too far / fast (hurried) / prematurely advanced. Satisfaction at the conceptual level must be fuller before moving on to the design level – actually, even before the drawing stage at all. See also:

A draft is not “further” or “better” than a preliminary draft – rather worse, because unsuitable (and more expensive besides). Many young architects of the “CAD generation” have not understood the technique of multi-stage designing; they immediately shift into third gear and produce drafts carelessly and uninhibitedly like Monday painters following the “Infinite Monkey Method” instead of working academically, technically clean and conceptually. That costs clients much time and money and leads to no viable results (because it simply cannot).