The granny flat in the south doesn't work because our garden is to the south.
We wanted a larger, contiguous garden.
Next to the carports?! You once had it in the west with a slim house. Now the house has grown, a story has been added, a pantry, a utility room, a freezer and a storage room in the basement, and mom is next to the storage room. If only the house had become smaller now so that you could have some of the 450 sqm. If one were spiteful, one would say that you don’t grant mom the entire length of the house because the windows would not meet the DIN standards. Hence the strange shape of the storage room. But if this is your wish, what is shown here, then so be it. However, I can’t see any logical implementation here. It can’t be that the poorly planned and quite inadequate granny flat is justified by the fact that the resident spends a lot of time elsewhere and doesn’t spend time at home. Then just give up the small office on the ground floor, that is at least accessible. Your number of people has now increased from 3 to 4... so you have to plan differently and resort to plan B. But here I see only bigger, more, and additionally a half-hearted flat in the basement. It’s not really a basement apartment. Currently, one can only say that a hole has been dug in the basement so that the apartment gets one or two daylight windows and so that living spaces can be created there. An apartment consists of living spaces, but living spaces are not automatically granny flats.
Technology: it will be a split unit heat pump
Technology also includes more than heating: water supply and drainage, electricity, fiber optics or similar...
The mother-in-law will spend a lot of time with us and at our place.
Sigh, see above. If I were the mother-in-law, I wouldn’t dare to invite anyone home. I find the apartment shameful. No matter how old/young one is, it just doesn’t fit. The only nice thing is the size, that is well done. Then at least make a nice sitting terrace out of the west area and keep the entrance via the stairs from the main apartment.