To build yourself (or someone else) a house or mansion you need to first build the area with suitable size (for houses 4×4 or 4×6 or so, for mansion it can be much larger (but should keep still each floor smaller than 8×8 and only 2-3 floors), for castle there is not really a limit).

For houses there can be few servants or pets (i.e 1 servant and 1 pet or 2 servants or so on). For mansions there can be 5-10 servants, guards or similar, for castles they should have lots of people.

Include the object named “Housing_<level>_<PCID>” where the level is the level of housing, and the <PCID> is the unique PC Identifier (can be seen for example when you target yourself and start sending bug report, it will show it in there after your login name, it is something like PC1103203232).

The doors you want to be unlockable by the owner key only should require key tag of “HouseKey_<PCID>”.

To set sleeping beds, make waypoint with name of “Housing_<PCID>_Bed”, and then set another waypoint with name of “Housing_<PCID>_Bed_01” which also has the animation used when sleeping (i.e. “animation,60,proneb,1.0,1”).

To set the freetime animation path, set waypoints with names of “Housing_<PCID>_FREE_01”, “Housing_<PCID>_FREE_02” etc.

Note that those beds and free time waypoints do not have the housing level at all, and you can have multiple sleeping waypoints with different PCID in the area, i.e if you want to make shared home for two PCs (or it is not really shared, it is owned by the one whose PCID is used in the “Housing_<level>_<PCID>” object, there should be only one of those).