... is not the OP who created the floor plan on the homepage and then wants to enter his mini ground-floor bathroom through the kitchen. HeimatBauer only pointed this out here with and described very vividly what you actually have to consider if you want to plan your new house to be divisible into 2 residential units.
Yes, I know! I have been following the thread here and also mentioned that I am against hijacking threads. That he presents his house construction with his considerations here is one thing, which the OP also cannot do anything with on 8x10, since the considerations go far back, e.g., the _why_ of a division into 2 living units. The OP has not even written anything about why he wants a separation, or who is imposing these requirements on him. But Heimatbauer takes my inquiries (see quotes) very personally and finds them intrusive. An explanation from me in his private message apparently upset him even more, and he took out his anger on me here again. I would say, and frequent readers here should have already noticed this: I am not at all a friend of not planning your house right away so that it is age-appropriate later. It can also be with stairs on two levels. Age-appropriate also means illness-appropriate, regardless of age. It means: being able to recover quietly on the sofa without discomfort, being able to reach the necessary sanitary facilities without intermediate doors and traffic areas in case of bowel diseases, somehow managing with walking impairments, e.g., by having the possibility to sleep on the ground floor, where life takes place, preparing food without having to go to a separate pantry for every ingredient (no, I am not against sensibly planned pantry rooms), all this should be feasible, whether within a family, a couple, or alone. I do not believe in separating the upper floor designed for 4 people from the ground floor. Because even if, due to age, one only stays on one level, family visits upstairs can benefit from this. Without these rooms, many situations would not be possible. It’s a pity. And if the children or grandchildren do not come at all, upstairs you can still offer a care helper a room and still have a room for your hobby or senior sports left. Rarely can the office on the ground floor serve as an age-appropriate bedroom for two. Of course, the saying "exceptions prove the rule" also applies to my opinion. Nevertheless, I am convinced that the majority tend to break down because of partner dementia rather than other age ailments, and then prefer the conservative form of living, namely a well-equipped apartment in assisted living. We once discussed a plot here that was offered near a newly built nursing home. A lot of negative things were reported about such institutions. But I would first have checked what kind of living is planned at the institution instead of just deciding against this plot. I do not know anyone in my or my parents’ (80 plus) environment who rented out to a stranger in the house. The basic attitude tends toward mobility, being glad to still be able to climb stairs. And if that is really no longer possible, the desire is not to look from inside sitting at the window at the garden that one planted or maintained 50 years ago, but then at the latest the desire arises to receive 24/7 care or attention rather than burden the partner. But, it is usually a personal and situation-dependent decision how and what one builds and how one wants to live. Only, questions must also be possible in this regard before they are seen as intrusive.