do you mean player owed housing , or would you like people to actually be able to place a shack? if its the former then there are some outlines on the wiki. The latter is a bit more complicated , and i am not sure any one has written a tutorial on the subject.
it would likely involve a extension of the HE edit tools , but you would have to carefully think out the rules for placement , whether you wanted npc's in that area that are using the navmesh, and probably a ton of things i can not think of right now, although im sure this might prompt a discussion of what you will also need to consider