ᐅ Single-family house, 200 sqm, with basement and double garage – what are your thoughts?

What changes or errors have we made in the layout of the individual floors?
Is the building cost estimate realistic? (According to the architect, approximately 13% additional incidental construction costs are to be expected.)

City villa / hipped roof
Plot size: 740 sqm, 31m x 23.9m (33,597 sqft, 102ft x 78ft)

Orientation: Entrance east, garden area west

Number of parking spaces: 2 plus double garage
Number of floors: 2 full stories
Roof type: Hipped roof
Style: Modern

Client requirements:
Style, roof type, building type: City villa, modern
Basement, floors: Fully basement, 2 full stories
Room requirements on ground floor and upper floor: Everything included in the floor plan
Office: Family use or home office?: Home office
Conservative or modern construction: Modern
Open kitchen
Number of dining seats: 10
Fireplace: Yes
Balcony, roof terrace: Yes
Garage, carport: Garage
Additional garden features: Pool approx. 9 x 3 m² (29.5 x 9.8 ft), oriented west, adjacent to terrace
Energy: Geothermal + solar thermal (no gas supply)

Thank you in advance.

Please insert as a JPG, thank you 🙂

Here it is in jpg format 🙂 Thanks for the information.

Yes, please jpg.

What strikes me at first glance:

Why is there a slanted door on the upper floor for the bedroom and child's room? What is the purpose of that?
Almost 33 sqm (355 sq ft) for the bedroom and dressing area, but only 14 sqm (150 sq ft) for a bathroom meant to be used by four people. To me, that seems unbalanced...
One child has access to a balcony, the other is left out, which is also not ideal.
Why do you need a 23 sqm (247 sq ft) bedroom? Is anything else planned for that room besides sleeping?

The orientation to the north is missing, but I assume the bedroom is facing south in a nice sunny position.
Therefore, for me, the upper floor should be completely redesigned:
Equally sized children's rooms with balcony access for both (or completely without a balcony; based on experience, balconies are rarely used if there is a garden) facing south.
Reduce the size of the bedroom and enlarge the bathroom or (even better) plan a bathroom for the children.

At the top, in the initial post, it says: Orientation: Entrance East, Garden area West.
Therefore, the bedroom is located northwest.

I assume you already have the budget, but do you really need a 200m² (2,150 sq ft) house with a fully finished basement for four people? Who will take care of cleaning all that space? Without a basement and with suitable replacement rooms on the ground and upper floor, I can understand 200m² (2,150 sq ft); that's roughly what we're planning too (rooms are not tiny but also not huge). But if you have an entire additional floor available?

I get the impression you planned the ground floor first, and then the rest of the space just followed from that. Maybe consider making the upper floor smaller than the ground floor, or move the multipurpose room and utility room to the basement?