Floor plan design for the renovation of a terraced house from the 70s

Ok, I think the questions about the noise area/chill area have been clarified after some "thinking". Unfortunately, I can no longer edit the post. You probably mean that the area where you "live day to day" (noise) is too "close" to the children's room?

One more addition regarding the basement and "how does the attic access the basement":

The "attic residents" come down to the basement via a staircase in the "common hallway". This is the internal lower staircase in the new basement plan (formerly "laundry room").

It is planned that the "basement bar" and "oil tank" (no longer present) belong to the ground floor. The "laundry basement" and "heating" will be communal. The two large basements on the right in the plan are intended to belong to the upper floor.

I personally like challenges, and if you have a little less floor space available, you can still make something out of it. But if it already needs extensive renovation because of the EE laws etc., then I would gut only what is necessary and rearrange. I wouldn't just cram things in. Are you aware that quite a bit needs to be done? I don't mean bringing the shower from 80 to 90 without changing the wall or bringing the kitchen window to countertop height – I think those are the least issues and come along with it. First idea: open the stairs to the basement in a livable way, possibly even straight into the basement bar, separate the lower part of the basement, and renovate the upper basement extension with living-quality standards, including windows with a view. The basement bar could become a bedroom, laundry room, bathroom. This possibility in mind relaxes the ground floor a bit. Zoning private and living spaces would be possible. A utility room on the ground floor would also still fit. First, I would roughly zone, rather without walls, possibly later including existing walls: Entrance -> Cloakroom -> Kitchen and living area with terrace -> Private rooms, between them a hallway and utility room.

I unfortunately can’t quite imagine that "visually" right now. Do you have the possibility and above all the desire/time to roughly sketch your idea into the images with the floor plans using Paint or something (no full plan, just roughly sketched)? Then I would have a rough idea.

The "attic dwellers" reach the basement via a staircase in the "common corridor".

Does this staircase already exist?

What does "children's room without zoning in the noise level" mean?

You probably mean that the area where you "live day to day" (noise) is too "close" to the children's room?

Exactly.

What is meant by "chill area in the entrance of the all-purpose room"?

It means that the sofa area is often used as a retreat, whether the kids for watching TV, the football enthusiast for watching soccer, or the Tupperware aunt for the girls' night. You don't want to be constantly confronted with other residents there. Well, girls' night can also be in the kitchen. Nevertheless: if you had options for everything, you would probably place the sofa rather at the end of a room and not in the passage area. A TV evening could become quite stressful over the years as the children grow older. The older the children, the more friends...

And what is zoning?

MN zones, at best, private and retreat rooms and the active rooms for everyone.

Sorry for the possibly stupid questions, but none of this means anything to me :)

That's okay. However, we are in a themed forum here, and as a questioner you can simply look at the other topics alongside and read how they have solved things, what advice they are given, and what else moves others. Then you quickly get into the mode you should be in ;)
And you also learn how the energy requirements are nowadays, what questions can arise at all, and what you have to deal with. It can also awaken desires you didn't have before. You certainly don't become any dumber.

Your idea in the pictures with the floor plans

I experimented a bit because I assumed a gutting. This is what came out (bedroom in the basement).

The "attic dwellers" access the basement via a staircase in the "common corridor."

And, couldn't that be used for a common basement entrance and close this second basement staircase? Of course, only if no living space is actually needed in the basement.

And, couldn't one use that for a shared basement access and close this second basement staircase? Of course, only if one doesn't actually need living space in the basement.

Yes, one could use the basement staircase from the "common corridor" for a shared basement access.

Is this staircase already there?

Yes, it already exists.

The idea is that people like to use the sofa area as a retreat, whether the kids watch TV there, the football enthusiast watches soccer, or the "Tupper Auntie" has a girls' night. You don’t want to constantly be confronted with other residents. Well, girls' night can also be in the kitchen. Nevertheless: if you had options for everything, you would probably put the sofa towards the end of a room rather than in the passage area. A TV evening could become extremely stressful over the years as the children grow older. The older the children, the more friends there are…

Yes, fits. That makes absolute sense and is understandable. Therefore: more than convinced that the previous plan was complete nonsense.
After some more minutes of thinking, I also understood what you mean. I was just too hasty with my contribution.

No problem. However, we are in a topic-based forum here, and as a questioner you can simply look at the other topics on the side, see how they solved things, what is recommended to them and what moves others. Then you quickly get into the mode you should be in ;)
And you also get to know how the energetic requirements are nowadays, what kind of questions can come up at all, and what you have to deal with. It can also awaken desires you didn’t have before. In any case, you won’t get any dumber.

Admittedly... my previous posts hardly convince that I had already read several other “floor plan” topics beforehand. Unfortunately, I completely lack the talent for something like this. I can’t manage to transfer these ideas and remain stuck with the rooms already there or with a layout where you’d say "yes, you can do that. But only at most in a rental apartment and even then rather - well." I am always amazed to see what is possible. But I just can’t get it to work for myself. As they say in school, “no transfer performance delivered.” So, many thanks for your help.

With technical topics like energetic renovation (what is mandatory, what is optional), funding, sizing of heat pumps, indoor ventilation, and such, I’m much more in the subject. Transfer skills are much easier for me there as well.

“Playing with floor plans” is unfortunately not my thing at all.

So, once again, many thanks for your floor plan idea. I would never have come up with it. I like it. Thanks.
I have already looked at it and noticed details here and there and found points that made me think. I’ll try to add more of my own ideas. But I have already caused one or two knots in my head again :D

With which program could you create the draft so quickly? With SweetHome3D it would have taken me several hours at least.