Newly built single-family house approx. 220 sqm, please provide comments on the floor plan

Whether the children's rooms are 14 or 20 sqm doesn't matter, they are now 14 years old, and when the house is finished, they will soon move out. That's why I'm surprised by the size of the house, it will soon be half unoccupied. I still find Hampshire's living arrangement optimal, with a wing for the youth.

This will most likely be the case no earlier than in 10 years, by which time we want to sell the house a few years later anyway. Until then, we want to live in large rooms, even if we don't fill everything with furniture. We have the characteristic of not forming an emotional attachment to a few stacked stones, so it is not nonsense to build it only for 15 years as some say, but rather living adapted to the respective life stage.

We also think it's great to find a separate wing for the youth, we just have to see if we can manage it.

We have the characteristic of not forming an emotional attachment to a few stacked stones, so it is not nonsense to build it for only 15 years as some write, but it is living adapted to the respective phase of life.

Not just read but also understand

You yourself wrote to live there for 15 years then sell. Then I would also think a bit about the resale. Normally I consider that nonsense, but if there is already a concrete plan...
And then I have to say that you have some disproportions that a buyer has to like first.

I wrote that I usually consider that nonsense. Normally, there is rarely a plan to sell the house again after 10 or 15 years. Mostly, homeowners plan for 30 or 40 years (or longer). Whether that then actually happens is another question.
That’s why I usually consider it nonsense to build a house based on the resale aspect. You should build it the way you like and what suits you.
In your case, however, there is a relatively short-term plan for a house. Therefore, I think it makes sense to keep resale in mind already when building the house. That does not mean too specific, because that is later the problem when reselling.
That does not mean that I consider the concept of selling it again in 15 years nonsense. That is your life planning; what should I interfere with?

But I imagine walking through your house as a prospective buyer in 15 years. It will not be the cheapest on the real estate market, it’s also large and has a few square meters. But nonsense, I indulge myself and I can. So I am impressed by the size on the ground floor. The large living-dining area. I frown at the two living room corners. I wonder why such a closed kitchen, but never mind, you can certainly tear the wall down. So I go upstairs, think Wow what a huge gallery, open the first children's room and hear the 10-year-old Torben-Hendrik from behind in his Prada sneakers ask if this is supposed to be his walk-in closet?

Not entirely serious, just want to say the proportions are not exactly mainstream and can sometimes be a hindrance when selling.

Really fun to doodle around with your house. Here are my 5 cents:

[*]Breakfast on weekdays is short, hurried, yet communicative, somewhat hectic and bustling. For such a lifestyle, the space in the kitchen is worth it. Quickly costs 20+x thousand euros because the floor space consumption is large.
[*]TV is not an extensive family activity. You sit alone or in pairs in front of the screen – I guess at least one sports fan and children who prefer to use their own screens.
[*]A sofa corner that is not oriented towards the TV suggests attentive sociability. Consistent to banish the TV. Due to the positioning in the middle of the "L," I can well imagine that the coziness of sitting together will not be maximal. Especially those facing the room have, depending on the furniture (here rather smaller furniture drawn), a lot of open space and potential "traffic" behind their backs.
[*]Like many builders in 2020, you have a BMW E30. Bicycles are probably not the children’s thing – the garage is not intended for that.
[*]For the parents upstairs, there is a very private wing, as if they finally wanted some peace again. I can totally understand that; we kicked the kids out completely, everyone now has their own front door, bathroom, and kitchenette – and everything has become easier and better for everyone. We also do more together again. Check if a granny flat for the two children, which could be rented out later, wouldn’t be a better and more resale-compatible solution.
[*]The living space is very large and has a lot of room between zones. With too low a ceiling height, it could feel oppressive. I would aim for about 3 m – but that would make the already rather short staircase significantly longer – putting some brainpower into it makes sense. An opening upwards to the "gallery" would bring little except to let noises from below reliably reach upstairs.
[*]Either way, the children will get a lot of what’s happening downstairs – whether voluntarily or not.
[*]In contrast to the spaciousness of the parents’ wing and the wasteful use of square meters on the ground floor stand the children’s rooms and the children’s bathroom.

Start by drawing the upper floor and then go to the basement. You need to accommodate more requirements upstairs. Let’s see how that will work out.

We have the characteristic of not developing an emotional bond with a few stacked stones,

That’s a rare statement from German builders. Buying a second-hand property could also be considered, right?

Thank you for the comments!

I would like to write here once again that the furniture is only a placeholder. Since I am not very familiar with the drawing program used, I simply took the first furniture pieces the program offered me.

[*]TV is not an extensive family activity. You sit alone or in pairs in front of the TV - I guess at least one sports fan and children who prefer to use their own screens.

this observation is correct

A sofa corner that is not oriented towards the TV speaks for a sociability that is more turned towards each other. Consistent to then ban the TV. Due to the position in the middle of the "L" I can easily imagine that the coziness of sitting together will not be maximal. Especially those sitting facing the room have, depending on the furniture (here rather smaller furniture drawn in), a lot of free space and potential "traffic" behind them.

that is at least our plan, that we don’t fill everything up with furniture. We want to be able to move freely without bumping into or having to push aside anything. However, the furniture arrangement is not yet fixed.

Like many builders in 2020, you have a BMW E30. Bicycles are apparently not the kids’ thing - the garage is not designed for that.

A nice 325i as an E30 would be great. Then I’d only have to get a gold chain. But the opposite is true. The garage will be used for everything like bicycles, but it will, like the current garage, only see a car during longer absences. Unfortunately, due to the building window, we can’t make a larger garage, as otherwise the house would become too small.

In contrast to the spaciousness of the parents’ wing and the wasteful use of square meters on the ground floor are the children’s rooms and the children’s bathroom.

If I roughly calculate, the 2 children have a total of 15+15+10=40 sqm of the upper floor available. The 2 adults have in the parents’ wing 14+13+12=39 sqm of the upper floor available. I do not see that the children are worse off. For us as parents that is even less than now, where we currently have 35 sqm sleeping area and 17 sqm bathroom.
Regarding the ground floor, what else should we put there?
We don’t need a guest room because we don’t want overnight guests.
We don’t need an additional study either.
What we want are large areas where we don’t have to make too many compromises on furniture.

That is a rare statement from German homebuyers. Buying a used property could also be considered, right?

We are 40 and 41. I can't imagine living in such a house for longer than 15 years. My wife just said that she can already imagine that. A used property is out of the question because after a few modifications, it usually becomes more expensive than a new build. Apart from that, there are rarely used properties of this size as a single-family house.