City villa subtly modern 218 sqm

Hello,

we have now been living in our own single-family house for a long time and now want to build new. I would not have thought that it is so difficult to design a suitable floor plan. Every change comes at the expense of another premise. Now we are stuck in a dead end where we cannot think of any further improvements. I hope that your fresh perspectives and open critiques will help us here.
Therefore, thank you in advance for all comments.

Development plan/restrictions
Plot size 1,220 sqm
Slope no
Site coverage ratio
Floor area ratio
Building window, building line and boundary - none
Edge development - double garage 7m (optional triple garage)
Number of parking spaces - 3
Number of floors - 2
Roof shape - hipped roof 25°, 80 cm overhang
Style - classic
Orientation - entrance = northeast
Maximum heights/limits - none
Other requirements - none

Client requirements
Style, roof shape, building type town villa, subtly modern, shallow hipped roof, KfW55
Basement, floors - 2 floors, no basement
Number of persons, age 4 persons - 2x 40 years, 1x 11 years, 1x 7 years
Room requirements on ground floor, upper floor - see draft
Office: family use or home office? - yes, 2 days a week
Overnight guests per year - 5-6 times per year
Open or closed architecture - ground floor open, upper floor closed
Conservative or modern construction - middle ground
Open kitchen, kitchen island - yes/yes
Number of dining seats - 6-8
Fireplace - no
Music/stereo wall - no
Balcony, roof terrace - no, but covered terrace on ground floor
Garage, carport - detached garage
Utility garden, greenhouse no
Additional wishes/special features/daily routine, also reasons why this or that should not be
Open living-dining area, lots of light, no narrow rooms, harmonious proportions and symmetries, cozy
Smooth roof tiles

House design
-Do-it-yourself planning
What do you particularly like? Why?
- Layout of upper floor, stairwell

What do you not like? Why?
- Children's rooms differently sized
- Study could be bigger
- Orientation not quite optimal
- Ground floor still missing something special

Price estimate according to architect/planner: €480,000 excluding garage
Personal price limit for the house, including equipment: €500,000
Preferred heating technology: ground-source heat pump

If you have to forego something, which details/expansions
-you can forego: actually nothing, most things are already rationalized (air space, fireplace and other frills)
-you cannot forego:

Why is the design as it is now? e.g.
A mixture of many examples from various magazines...

What is the most important/basic question about the floor plan summarized in 130 characters?
How can the ground floor be better designed, are there major conceptual errors?

In the aerial photo it is the lower house on the right.
The hatched area should roughly represent the paved area.
Driveway past two gray corner bungalows.

Supplement. The porch roof and terrace roof are also covered with roof tiles at a shallow angle. Unfortunately, my simple program cannot display this. I am also not completely convinced by the proportions of the windows yet.

We have been living in our own detached single-family house for a long time now and now want to build new. I wouldn't have thought it would be so difficult to design a suitable floor plan.

Why is that – isn't the currently inhabited single-family house detached?

Every change comes at the expense of another premise.

I haven't yet inferred the ranking of the premises (?)

Old man! You first have to be able to afford 43 m² of hallway. I find the floor plan somehow unbalanced, namely large but also somewhat clumsy. Has the architect already seen it? Or how do you come up with the price estimate (which at least shouldn’t be completely unrealistic - only that your personal price limit is somewhat questionable, since it won’t work under normal conditions).

The price limit might be a bit tight, in my opinion. 218 sqm x 2,250 (conservatively estimated) brings us to €490,500 without ancillary construction costs. Am I overlooking something?

I think 218 sqm can be distributed more efficiently, the ultimately "usable" area is only 175 sqm, as a lot is already taken up just by the hallway. In principle, you actually have many freedoms with a house with two full floors.

Here are my points that caught my eye at first glance.
GF:
- Hallway too large with too little usable space
- The wardrobe will probably pave the way into the study with obstacles like shoes in reality
- The double-wing living room door will be a disturbance in the room as soon as it is open. Maybe consider a slightly larger sliding door that disappears into the wall?
- You can only get to the garden after an obstacle course between furniture.

UF:
- Quite a bit of space is wasted in the bathroom. I would consider a better layout without a T-wall
- With the living area, I would miss a small storage room for vacuum cleaner, cleaning supplies, etc.
- I would rethink the arrangement of the windows. Especially in the children's rooms, a lot of wall space is currently lost (e.g. also for a desk)

I would check if maybe the staircase should be done differently as well. For the size of the house, I would almost go for a straight staircase.