Buying a piece of land with the parents - Will that work out well?

How much are you actually allowed to build? Rural normally means a plot ratio of 0.1 or 0.2... with 1000 it would be max. 200 sqm...

So, what does the plot ratio/floor space index say?

By the way, these are also points that can significantly burden a later sale if you share any technology for two houses / units!

Wow, there are very beautiful houses where 2 residential units share one system. If the location and price are right, you wouldn’t say no if it’s a nice place to live, would you?!

How much are you actually allowed to build? Rural usually means a plot ratio of 0.1 or 0.2... with 1000 it would then be a maximum of 200 sqm...

So, what does the plot ratio/floor area ratio say?

The floor area ratio is 0.4, so it should be fine.

Oops, there are very nice houses where 2 residential units share one system. If the location and price are right, you wouldn't say no, would you, if it’s nice living?!

But if I could plan it in a new build, I would definitely avoid it. I currently notice with my apartment that separate systems definitely make the sale much easier.

Communication beforehand is simply crucial here.

We are building into the extended garden of the parents-in-law, but both houses are about 70 meters apart, with outbuildings in between, so you can't even see each other at first. In summer, that might happen more easily; the used part of the parents-in-law’s garden including the terrace/grill is practically our "neighbor," they spend a lot of time there, but an existing embankment separates the two properties. This natural privacy screen was/is important to us. And not only to us, but also to them... that is the decisive factor. We said beforehand that we want to be able to have our peace, the other "side" feels the same, even though we get along really well.

Discuss everything beforehand, then decide if you want it. I wouldn’t have built door to door, but as described above, it is absolutely right for us. You have to make the decision for yourself anyway, feedback aside ;)

Floor area ratio is 0.4

Hopefully the site coverage ratio is meant, otherwise it could get tight.