Bungalow floor plan max. 140 m² - dimensions according to the standard ok?

That's why I say: let someone else design a different draft. Bungalows can also be different from these L-shaped corridors.

An alternative would be the living room as a passage to the other rooms. For various reasons (which I don't need to elaborate here), this is not an option. We also prefer the hallway because a built-in closet is available as storage space and the entrance area should be spacious when guests come, so that people don't step on each other's feet there. Unfortunately, that is the case in our current apartment and is unbearable. We were inspired by Viebrockhaus (Edition 500 B). There must be good reasons why the bungalow is arranged with an L-hallway.

I say the same .. another draft ... but now a north-oriented site plan with dimensions and access options would be relevant.

I also think more can be made of it ... and why does the office have to be in the private area?

I have attached the north-oriented site plan. The house is not drawn on it. The orientation should be towards the east since there is a semi-detached house to the south.

For various reasons, the study should be separate, especially since I don’t want to have guests or clients walk through the dressing room, right? Even if it was a child's room, it is still suboptimal that the child has to go through the parents’ dressing room first, isn’t it?

Now I understand the thing with the airspace. In the view, those are windows and not a solar system? Which type of heating are you building with? Can you do without solar? We had a thread last week about the southern roof windows, where the OP asked about thermal insulation. That's not so easy with southern roof windows because getting the heat out of the house again is difficult. We ourselves have the living room open to above and a nice window under the gable. That’s enough for lighting and effect. In summer, you have to be able to close the south side tightly. The house heats up quickly to 27 degrees.

Exactly, those are roof windows. We are foregoing a solar system because we are planning with a geothermal heat pump and a photovoltaic system. That will be installed on the southwest side. The roof windows face east and are shaded with exterior roller shutters.

I would rather call it an "open roof soffit" anyway. Presumably, they understood it just as little as I did - why is it specifically desired over about 60% of the dining room? What is it supposed to do there (with a gable and glazed area I would have understood it) ? - nevertheless: did they explain why it cannot be done that way?

It’s pointless to explain why one would want an air space. Of course, to create brightness and spaciousness. Especially in the kitchen, there is a lack of a window. 60%, so that the roof windows are centered. The air space should be exactly above the dining area. See photo.

Supposedly, the ceiling cannot be designed open there because the roof truss construction rests on the wooden stud framework.

Aha. And where is the terrace? Is it by the bedroom, in front of the bay window, or between the bay window and the living room? And I notice that many questions directed at you are still unanswered. What kind of rooms are those on the right bottom side?

The guest room? With 2 beds? It's also quite uninspired. 2.20 meters in the dressing room would be too narrow for me (not that I'm fat or anything ) The living area, meaning the open-plan room, feels too much like a hall: from the sofa you look directly at the kitchen, that could be arranged more cleverly. The space required in the other rooms is too much and unnecessary here, even if it is supposed to be spacious. The latter can be done differently as well.

Which questions are still open? The terrace is located between the bay window and the living room facing east-southeast. The bottom right will only house technical equipment. Therefore, we are still planning another laundry room.

The guest room was only marked with 2 beds on the plan. This is also just a draft and the furniture can vary.

The separation of the living area will be done by the fireplace; in a two-person household, the open kitchen and living area is desired this way.

No need to explain why someone would want an air space.

No, it wasn’t clear to me at first either that it was supposed to represent roof windows (since I don’t see them in the floor plan).

Allegedly, the ceiling can’t be left open there because the roof truss construction rests on the timber stud wall.

Sort of, that doesn’t necessarily exclude each other. However, in this area you would then have visible trusses.

Attached is my proposed change for the roof structure (left as originally planned; yellow indicates the desired air space respectively; right the variant). If the roof section above the dining area and covered patio were executed as a gable – otherwise the hipped roof can remain – an alternative to the double casement window would be a gable glazing:

The study should be separate for various reasons, above all I won’t want to lead guests or clients through the dressing room, right? Even if it were a child’s room, it’s still suboptimal that the child has to go through the parents’ dressing room first?

Well, if you want input for improvements, then such specifics should be mentioned already in the first thread. But I wonder why the office is supposed to be located in the private zone if there are visitors, as you say. I don’t quite understand that, and apparently you’re annoyed because the requirements are being asked here.

No one suggested routing the office or customers through the dressing room. It may all be set for you, but we review drafts throughout the year and sometimes think outside the box or not just "off the shelf," like Viebrockhaus does.

Take a look at the bungalows at Danwood, just to throw it out there that these bungalows can also look different. Scanhaus Marlow Marlow has also caught up: by moving or omitting some walls here and there, you get a completely different feeling of living in your own walls. But you know that yourself.