Single-family new building: Planning a granny flat for future family expansion?

I would move the granny flat to the attic. 2-3 rooms, hallway, kitchen, bathroom. Think about having the luxury parents' area with shower and walk-in closet on the ground floor. You have a large plot. So you just build 150m2 on the ground floor and depending on the development plan and house shape 110-150m2 on the upper floor.

:D :D :D yeah sure, 300 sqm living space,... why not! What was the budget again? Possibly for four people. Plus 3-room apartment in the attic.

:D :D :D yeah sure, 300 sqm living space,... why not! What was the budget again? Possibly for four people. Plus 3-room apartment in the attic.

Can @hampshire say something about the lead time?
If I'm not mistaken, he implemented something like that, but with 2 apartments and not connected.

No.

A separate residential unit that is also to be subsidized requires an adequate bathroom, a kitchen, bedroom, living room, a hallway, a storage room with washing machine connection, a separate water meter, a seating area, an additional staircase, another house entrance, and a parking space. Also a few nice extras that somewhat sweeten the downside that the landlord lives next door. If the target group is a couple, then provide two parking spaces. If you live out in the sticks, you won't attract any students.

If the granny flat is also supposed to be barrier-free, then plan for 30% more floor space for the apartment because accessibility is expensive and consumes space. It also has to be wheelchair- and care-friendly.

What do you mean by meantime? Do you think you can just terminate the apartment like that if your family planning works out?

And then also basement.. voluntarily no one moves in there except if they don't want to have anything to do with people, are a light nerd, and listen to weird music ;) All in all, you want to move into this basement apartment yourselves, which is apparently to be built so that it only suits one tenant?! I wonder where you want to accommodate your fitness palace then :oops:

Very detailed answer, thanks! .., The input really helped us.

What does Zwischenzeit mean? Do you mean you can just terminate the apartment like that if the child planning works out for you?