Penthouse floor plan - Is it that practical?

Hello everyone

Development plan/restrictions
Plot size: 2429 m²
Slope: slightly sloping down to the left (when looking at the plot from the street)
Building window, building line and boundary: only 5m boundary distance at the front and back
Floor area ratio: 0.4
Number of floors: 1 full floor

(There are actually no further restrictions such as roof pitch or similar.)

Requirements of the builders
Style, roof shape, building type: actually 2 full floors were desired -> townhouse
Basement, floors: no basement, 2
Number of people, age: 2 (planned 4), 23 & 26
Room requirements on ground floor, upper floor
Office: family use
Overnight guests per year: hard to estimate, rather few
Open or closed architecture
Conservative or modern construction
No open kitchen, preferably with cooking island
Number of dining seats: 6 (+ expandable to 12 for birthdays/Christmas)
Fireplace yes
Music/stereo wall: 5.1 surround system
Balcony, roof terrace: no
Double garage
Small vegetable garden
Other special features: it should be a smart home

House design
Who designed it: do-it-yourself, in 3D view by the developer
What is disliked? Why? More covered terrace would be desirable
Price estimate according to architect/planner: 265k€ for the house + 58k€ for the garage
Personal price limit for the house, including equipment: 300 - 320k€ (own contribution in electrical area etc. is possible)
Preferred heating technology: geothermal heat pump

If you have to do without, which details/extensions
-can you do without: size of the children's rooms and the bedroom

Why did the design turn out as it is now? months of self-planning

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

Basically, we like the floor plan. Of course, considering the costs, it would be nice if we could save a few square meters without noticeably losing living space. That is exactly the crux. Is the floor plan practical? Or could small changes bring more (space/comfort/cost savings)?

The file Grundriss 2 shows our planned floor plan on the plot with the approximate sun path. On the left side in the top view there is already a bungalow. On the right side it slopes increasingly downwards and nothing has been built there yet. There, however, 2 full floors are possible. There are no trees. The plot consists only of meadow.

I hope I have gathered the main points and look forward to your feedback.

Regards denz

I really can't figure out how your GU comes up with the idea that over 200 sqm of living space should cost €265k. There must be a lot of items omitted. I would advise caution here.

It is 176 sqm.

PS. It was still calculated with an air heat pump.
It was calculated with conventional electricity. The smart home system will be implemented by the owner.

Ok. I thought there were supposed to be 2 full floors. My mistake. But that only makes it somewhat better. At the moment, one calculates with €1800-€2000 per sqm of living space, right?

At the moment, they calculate with €1800-2000 per sqm of living space, right?

But not in Meck-Pomm

The entrance area is not really my thing. You stand in front of the stairs and almost trip over the first steps. But okay, with a proper handrail you can easily get past it.

If you want to save m², just push it together in width, I would say. The living room can easily be smaller, the bedroom upstairs too, a utility room with 14 m² is also oversized, and in the bathroom you can wash very well on 10 m² – if you remove the stupid T. 1 meter or even more is definitely possible there.