indeed, maybe if you hire a npc or a player with that job, he can tell you if you may build there or not. This will be only in \'controlled\' area\'s.
Controlled area\'s may be area\'s that are under supervision of a goverment or something like that. It could be the same area\'s where you can not PvP.
In de uncontrolled area\'s you may build where you want (should be no problem if it is big enough), and PvP. You can say that uncontrolled area\'s are just anargy area\'s or something like that