In the manual it says:
"Take Land
You can also take control of land, enlarging your grounds. You can take common ground and add it to your own land, or you can take other peoples land, which will make this land disputed and common ground (which you can then take the next day if nobody interferes). You cannot take the sleeping home from someone."
What it doesn't make clear is that you also can't take a house located in common land...is this intended, or a bug?
If someone sleeps in it, then it is a sleeping home. In-game you can check if there is smoke rising out of the chimney.
