Draft floor plan of a single-family house (convertible to a two-family house in old age) on a slope

I have said everything I wanted to say about the floor plan. But since I just wrote it somewhere else, I'll quote myself regarding the granny flat in general

Many have no guests and hobbies until the children leave the house. But I think you have to weigh that yourself.
While the argument of the granny flat for possible family members (children) is often used, in my opinion one should simply consider the most obvious thing before cutting off half of the house by separating the usually upper floor and then wanting to live on 80 sqm with a small shower bathroom. Namely, the children move to another city, want to live in their own little house with family, and then one or two rooms, namely the old children's rooms, can be used for visits from grandchildren and new hobbies, for which there is then also time and inspiration.
Many here no longer think of the obvious at all. Only the extreme worst cases: comfort and luxury/size in first place, and when children are grown, then a granny flat for them and restricting oneself from 200 to 30-40%.
I see in very rare cases that people choose that "in old age" as an option. …

Compromises are okay. But subordinating the whole house to a way of life that is not obvious and restrictive only leads to dissatisfaction.

The 2 entrances and the staircase need a lot of space that you are missing in the open plan area. The wardrobe also has 1.5 sqm of hallway space even if it is not declared as such.

In the previous draft, we only had one main entrance, the only thing that benefited from this was the WC on the ground floor, which I have to say is fully sufficient in size for me. So yes, we considered it at one point because it initially seemed obvious for us, but the location of the staircase in the middle of the house best connected the upper and lower floors in this version, so we decided on this variant.

Really draw all the furniture to scale and take necessary movement areas into account.

I will do that later, we did it in an old draft, but not yet for this version, I’ll do it that way. Although I can say we have already seen the floor plan furnished in full scale and changed a few small things we didn’t like, and we actually found out that this arrangement gives us quite a bit of flexibility on the upper and lower floors. Only the ground floor is fixed and can’t be changed much. But that also depends on the room layout relative to the cardinal directions and the slope.

But subordinating the entire house to a lifestyle that is not obvious and restrictive only leads to dissatisfaction.

I, or rather we, do not consider the compromise to be that big, of course you could easily have 5 sqm more on the ground floor, but you quickly fill that with stuff you neither need nor which adds any quality of life. Maybe the thread can be closed with the conclusion that this house plan is not to everyone’s taste, but for our budget, our lifestyle, and preferences, it certainly does not represent a complete misbuild!?

You spend most of your time on the ground floor.

You have 42 sqm assigned to living areas. Part of this is unfurnished in the kitchen and part in the wardrobe - hallway.
17 sqm hallway unfurnished area.
The reading area - quiet area lies between the kitchen - dining - hallway, so exactly in the busiest area.

Let's leave aside the slope and the two-family house planning. Ground floors are often planned so that the following is considered:
Kitchen as close to the terrace as possible
Living area 4 m wide is not a mistake with the currently usual TV sizes
Staircase not next to the door. How often do you walk past the entrance door not quite in daylight? In the end, even with a glass insert
Wardrobe next to the entrance. With 2 doors and 2 storage options, shoes and jackets are always hanging on the wrong door.

You also have a lot of empty space in the basement. Large hallway, dressing room with few cabinets and a lot of traffic area, the conservatory that will heat up the sleeping area enormously.

I would shift rooms again and not consider a two-family house plan at the staircase. Which does not mean that the staircase is planned open into the living area.

Plan a step-free path to the garden. Hand truck, wheelbarrow, etc. must be taken down and back up with a load

I am optimistic and a good planner can also be better than a bad architect

Cool saying, but in reality your plot is unfortunately even more challenging than 's:

but in reality your property is unfortunately even more demanding than that of

You mean more interesting or exciting ;) I know that we didn't choose an easy property, but anyone who wants an affordable property in a reasonably good location here in the region has to be willing to face such challenges, or build elsewhere. We then decided for the challenges :)