Single-family house 130-140 m² floor plan planning

Development Plan/Restrictions

Plot size = 600 m²
Number of floors = 2
Roof style = Gable

Requirements of the Builders
2 children's rooms
1 office
1 dressing room
1 bedroom
Guest WC and bathroom
Open kitchen living area
1 utility room
Double garage with storage area

House Design
Found on the internet

Why is the design the way it is now? For example
Plan that currently fits best
Utility room and office are swapped due to door to garage
What is disliked is the large hallway on the first floor
The footprint of 9.5x9.5 should be maintained
Floor plan as simple and cost-efficient as possible
No frills

What is the most important/fundamental question about the floor plan summarized in 130 characters?

More elegant solutions with less hallway loss?

The floor plan is not dimensioned. It is difficult to say anything like this.

The hallway has to be this big because of the stairs. With a different staircase, there would be less hallway.

Be sure to draw the floor plan with to-scale furniture, e.g., the bed in the bedroom is approximately 140 cm wide.

The kitchen is usually the first room you should enter, e.g. to put down groceries and immediately start heating the water for tea after coming home, or conversely to take the trash out of the kitchen and through the front door. Also opening the door for guests while still preparing.... None of this really works here. For me, the kitchen or the staircase location is not suitable for everyday use.

I see it exactly the same way as ypg. The kitchen would be far too far away for me. The staircase is rather unsuitable for the size of the house.

Found on the internet

A Laux Novus from the catalog, with the only modification being the substitution of the tent roof with a front-facing gable roof (what does the development plan say about that?). Aha. No more variations than those mentioned below are planned?

Utility room and office are swapped due to the door to the garage

which has not yet happened in the shown plan

What is not liked is the large hallway on the first floor

The long walking distance results from the single-flight straight staircase type, which is unsuitable for this house size.

The footprint of 9.5x9.5 shall be maintained.
Floor plan should be as simple and cost-efficient as possible
No frills

The Schmalhans-instead-of-villa format and the massive double garage correlate, in my opinion, with two different income groups. I would rather call the "simple" here "run-of-the-mill," and regarding the fit for a specific family, a catalog design is rather not efficient.

More elegant solutions with less hallway loss?

You have chosen a house design with a straight staircase. The straight staircase uses the most hallway space, while a double-turned staircase uses the least.

One question: why are "you" taking a design from the internet? Most general contractors won’t build you someone else’s design, at least not cost-neutrally compared to their standard houses, since they have to draw the house themselves first.
Why don’t you have an architect work for you or take a design from your general contractor?

What is the budget?