Floor plan house with granny flat - improvement suggestions?

I was thinking more about explanations of the two pictures (on the left what is the thick line in the middle of the image, on the right the designations of the things with the numbered red dots, etc.). And/or you say (caution, without link!) where this information can be found...

It was not so easy to find more information about the technology in the utility room. Today I had to call the municipal utility company three times before I got this drawing from a technician...

With this plan, 2 doors in the HAR would be difficult, right?

..definitely, especially since the doors open inward. But the architect said that it would still work.

... is the stay-at-home career sealed.

..we will not allow that in the long run. Then he will have to find his own place. Especially if he later brings visitors home.

It wasn't so easy to find more information about the technology in the utility room. Today I had to call the municipal utility company 3 times until I got this drawing from a technician...

Unfortunately, it only makes us a little bit wiser, at least it is now "clear" that the thick line probably means a corner ...

Unfortunately, it only makes us a little wiser, at least it is now "clear" that the thick line probably means a corner ...

..unfortunately, I couldn't get any more information on the phone today. For further questions, I was told on the phone that I should arrange a personal consultation on site. I will stop by the municipal utilities in the next few days, maybe then we will get the answers we need.

I was at an architect’s site today; he was recommended to me by acquaintances. He looked at our planning and was also bothered by the staircase in the granny flat (like everyone here – so no surprise). When I asked how this problem could be solved here, he had to think for a long time. Unfortunately, nothing came to him immediately until I gave him the tip that maybe the utility room could be housed in the garage (the garage is too small for 2 cars and maybe a little oversized for 1 car). He liked this idea. The parents' bedroom should be pushed further west (where the utility room is now), and the shower bathroom should be on the eastern wall of the parents' bedroom. This would increase the parents' living area to about 26m2 and the staircase could remain where it is. Furthermore, he suggested that the staircase in the main apartment could be reversed so that you would enter the 1st floor from the living room. This would have the advantage that the guest WC could be moved under the stairs, thereby gaining additional space for our kitchen. Could you follow me? Unfortunately, I don't have floor plan software and hope I described it somewhat understandably. I still have to clarify with the municipal utilities whether the technology can even be housed in a separate room in the garage.