Floor plan draft for a single-family house - Your opinion?

If you have that much choice, fine – then you can do it that way.
Only the room program is exactly what's missing!
Otherwise, 500 sqm is okay, good orientation. The rest is made by the infrastructure, not whether your sofa fits in a niche.

The selection is anything but large. But we have no time pressure at all. At least we know now that we won't manage with less than 500 sqm.

And wouldn't it then be better to change the 6.5? You have to come to the conclusion that it's stupid for watching TV...

Our thought process was this: with a screen diagonal x3 we would need about a 75" TV. That's fine. Our TV hardly runs anyway. There are more important things in life.

Oh, and you do that every evening in winter?
By the way, in summer the sun sets in the NW...

In summer you can sit outside anyway

And what about the heavy walls above? There must be some stability underneath?!

Maybe I thought too simply there. I was under the impression that aerated concrete walls wouldn’t have that much influence. And if necessary, beams or something similar. We’re not the first to want a large open space, are we?

Not to anyone. That’s called design and not everyone can do it. Architects who have those special qualities do it. Further knowledge is studied.
There are laypeople who have this fine sense and the ability to recognize and design 2D in 3D and vice versa.
To be clear one more time: the design is crap.

Yes, we know now. We will continue to torture pen and paper

We are of course grateful for further tips and experiences

I actually prefer handling it with pencil and eraser

And that's perfectly fine to see. Many amateur planners believe they first have to "comb" their drafts on the PC to be presentable, because the hand-drawn lines are kind of like messy hair, and one is only allowed in the forum with straight lines. But that's nonsense. What you get "scolded" for here is something entirely different, namely for stairs turned the wrong way, no matter how neatly they are drawn. So: always boldly bring on the scribble sketches!

Yes, the seating distance is a bit large at about 6.5m.

Given the content quality of TV programs, it's a mystery to me how one can assign the heaviest weight precisely to the opinion of the television set about where the seating area should be placed most beautifully.

The room width is 5.5m, that should be achievable with a filigree slab? according to my first research.

A "filigree slab" is structurally absolutely identical to other reinforced concrete slabs. I get the impression that many laypersons imagine a slimmer and lighter slab under this term. Firstly, that is not the case, and secondly, where the slab is the floor of the next story, its load-bearing capacity does matter. And always its stiffness against bending.

Yes, the WC and utility room were no work of art. They were simply placed where there was still space. The upstairs bathroom as well.

That too is an amateur planner's mistake, which reliably makes it into one of the top three places: the lack of awareness that drain pipes have a voting power in floor plan layouts similar to load-bearing walls.

Our line of thought was this: For a screen diagonal x3 we would need about a 75" TV. That fits. But our TV is rarely on anyway. There are more important things in life.

If you take a 75-inch for more important things, explain that to me.

In summer you can sit outside

Yes, but you have your garage as a "privacy screen" stuck to the sunset.

Taking a 75-inch for more important things, explain that to me.

Whether you place a TV in the standard sizes between 42 and 65 there or take a more expensive 75-inch plays only a minor role in the costs of a new building.
Low TV usage does not automatically imply a small TV size, does it?

Yes, but there you have your garage as a "privacy shield" for the sunset

In its last meters, the sun would disappear behind the trees 100m away before the garage would play a significant role.

A new sketch is in progress

I have just finished the ventilation planning. And I can say it was a struggle to plan the ventilation openings from the basement through the ground floor into the upper floor, so that I can run the ventilation ducts in the upper floor above the ceiling.

Therefore, be aware, I do not see a central ventilation system for you. Unless you are willing to install it in the walls on the upper floor and hollow out the 42cm to 20cm.

The debris/wall connection that was supposed to go into the exterior wall really scared me.

If you want garages on the left and right, you can also put a workshop across the back. Then you have a four-sided courtyard. No one can see in for sure, and you can't get out either, and you are also completely protected from the sun.