Floor plan of a single-family house on 450 sqm of land

Development Plan/Restrictions
Size of the plot: 450 sqm
Slope: no
Floor area ratio: 0.4
Plot ratio: 0.6
Building window, building line and boundary: 3m to the property boundary
Edge development
Number of parking spaces: 2
Number of storeys: 2
Roof shape: no restrictions
Style: modern and open
Orientation: no specification
Maximum heights/limits
further specifications

Requirements of the builders
Style, roof shape, building type: preferred gable roof because of photovoltaics
Basement, storeys: 2 storeys without basement
Number of persons, age: 2 persons (28, 30), 2 children planned
Space requirement on ground floor and upper floor: approx. 160 sqm
Office: family use or home office?: home office combined with a pull-out couch as a guest bed. Home office about 50% of working time
Guest sleepers per year: approx. 3 per year
Open or closed architecture: open
Conservative or modern construction: modern
Open kitchen, kitchen island: absolutely
Number of dining seats: 6 standard - open upwards :D
Fireplace: optional
Music/stereo wall: optional
Balcony, roof terrace: no
Garage, carport: double garage would be our wish, might be difficult because of no distance to the street (however, there are examples of this in our town). Alternatively double carport
Utility garden, greenhouse: planning still open.
Further wishes/special features/daily routine, also reasons why this or that should or should not be

House design
Who designed it:
- Do-it-yourself
What do you especially like? Why? Open kitchen & dining area, spacious ground floor, somewhat separated living room, large technical room (as basement replacement), spacious study, southwest terrace, efficient use of the plot
What do you not like? Why?: No direct access to the garden, little window area facing the garden, possibly too little parking space???
Price estimate according to architect/planner: not yet available
Personal price limit for the house, incl. fittings: 550k €
Preferred heating technology: trench collector, alternatively heat pump

If you have to give up, on which details/extensions
- can you give up: We tried to limit ourselves to the essentials (basement cancelled, carport alternative, optimal use of space in the upper floor, ...)
- can you not give up: number of rooms, spaciousness on the ground floor

Why did the design turn out as it is now? For example
A mix of many examples from the forum, online floor plans, own ideas
What makes it particularly good or bad in your eyes? Efficient use of space in the upper floor and the plot

We are very much looking forward to your comments

Plot overview:
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Ground floor:

[ATTACH width="509px" alt="EG.JPG"]85367[/ATTACH]

Upper floor:

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Is there no development plan?

Dimensions of the property?

Is there no development plan? Dimensions of the property?

There is a development plan. I have inserted the requested points from it above, I can gladly provide more information. What exactly is missing? The property is approx. 18x25m, but not quite square (as can be seen in the property overview picture)

Since you don't know what matters, better show the plan. No link.

What exactly is missing?

The plan with the building window and the surroundings. One wonders here why everything is pushed forward, as if the plague had broken out in the east, or there was a nuclear power plant or a landfill.

Floor area ratio: 0.4

Out of 450 sqm, that is 190 sqm. But in your case, it has become a little more.