Are doors necessary on our ground floor? Floor plan attached

Is that still the case in modern houses? I always read that with underfloor heating all rooms are heated to the same temperature. But also the basement?

It depends on how it is planned. If you have the heating for the living areas set to 22 degrees (I consider the standard 20 degrees as 08/15 for everywhere to be too low), the basement (which is inside the thermal envelope) will certainly not be heated that high. Maybe around 18 (?) degrees there. In that respect, you do notice it. Even if there should be no drafts in the house, especially not that cold air from the basement comes up massively.

and built up to the basement wall just as high

I don’t quite understand that, what do you mean by that? In the picture, only the back wall is “built up”, right? Do you want to close the basement stairs and place the upstairs stairs on the “zigzag wall”? Then you could consider (only) turning the basement stairs by 1/4 and accessing them from the hallway. But would the closed “block” look good then?

Regarding warmth: Cold air doesn’t rise, of course, but it still lowers the living room temperature because the air mixes. A small heated basement hallway could help here. The cold rooms in the basement would then have to be closed off with doors.

Overall, I would swap the kitchen and the living room. I find the kitchen too big and unergonomic and the living room too small and uncomfortable. A sofa with its back to the garden and a view of the front yard, stairs, and hallway would not be my thing at all. But if so, please WITH a door. Otherwise, you’ll also be looking at the (sometimes maybe messy) coat area and the toilet door.

What is it that you always have against downpipes in the living area? We have one from the upper floor shower in the open-plan living space and had it specially wrapped with some stuff and that's fine.

Then you could consider (just) winding the basement stairs 1/4 turn and accessing them from the hallway.

I also came across this idea, which is obvious. Only it is not desired to make such suggestions. On the contrary, a discussion is no longer desired.

But does the closed "block" then look good?

There would be potential in the execution. After all, they want an eye-catcher.

On the topic of living room and kitchen: our architect actually first designed the living room and kitchen differently - the living room in the south and the kitchen in the north. We disagreed with her. Why? Because we actually spend an extremely large amount of time in the kitchen and very rarely in the living room. In the living room, we are basically only there to watch TV (and even then, rather rarely). We both spend a lot of time in the kitchen (hence the desire for a large kitchen) and with guests we almost always sit at the large dining table.

By the way, in our rental apartment we currently also have a large L-shaped layout of kitchen, living room, and dining room and have therefore “settled” on it over the years...

We really like this solution and it may not be quite “standard,” but it is adapted to our life. The view of the garden is actually only important to us from the kitchen and the dining room. In the living room, we at most stay there for about 2 hours at night to watch TV... when the blinds are already down anyway.

Since we do not want children either, the living room will never play a major role in our lives, neither for offspring nor for visitors.

The house is simply not a catalog house, but adapted to our life.

It is just not desired to make such suggestions. On the contrary, a discussion is no longer wanted.

Oh, someone is feeling a bit offended. Next time I'll send you my floor plan before the start of construction and have you approve it.