Plot for construction next to existing building - "Single-family house in Grandma's garden"

No, we have not obtained any official information so far.

Then of course many of our tips are not necessarily feasible. First of all, everything legal should be clarified: what could be done, what is allowed, what is not allowed, what must be observed.
And you should acquire some basic knowledge.
However: given the mentioned structure, I would assume that an "additional house" and thus an additional development there is permitted.

I don’t quite understand the reference yet. To what extent does the boundary development with another property affect our considerations? The distances at the boundary to grandma’s property are being observed anyway.

Sorry, but I can hardly see the garage row on the display. I also don't know if your red line is exactly placed.
If the garage row is boundary development, then you would have to observe 6 meters of clearance area yourself instead of 3 for the special development.
If there is a path or green strip, then you’re in luck.
From left to right: 3 meters clearance area, 9 meters grandma’s house, 3 meters clearance area, new property boundary, 3 meters clearance area, 9 meters new house, 3 m clearance area... makes 30 meters. So theoretically it works. Without keeping the double garage.
Or pure theory:
You split directly on the east side of the garage, build boundary development with your house yourself (which then means no window is allowed on the west side) and build an approximately 8 meter wide house on an estimated 11 meter wide plot.

What else can be seen in the photo? That looks like another house to the north?

I understood it like this: You have to have the property subdivided so that the house on it later belongs to you / you all. The house belongs to the one who owns the property. So the garage is located where the later imagined new boundary of "your" property runs. And distances must be observed here as well

You don’t actually have to subdivide, I think. You can also subdivide in principle and have half of the property transferred.

One does not have to divide real property, I think. One can also divide ideationally and have half of the property transferred.

... but then one can no longer finance. Or only always everything together.

... but then you can't finance anymore. Or only always everything together.

Why not? You can also get financing for ideal semi-detached house halves?!

Why not? Ideelle DHHälften are also financed?!

Only as an ETW. If you meant something like that, then it's true. If you mean that then Grandma holds 1/2 and 1/2 of the entire property, then no. I had understood the latter.

I don't know what I meant :cool: I think there are several options that could be discussed with the notary.