I think having the party be a team of building inspectors would make an interesting adventure premise. An authority figure hires them to assess ruins and decrepit sites to make sure nobody is turning them into evil lairs. Gotta keep the riffraff out. In some cases the party would find villains in the act of setting up shop. Other times this isn't happening but they must contend with a site's own resident evil. Or the place itself is totally clean but the seemingly normal village inn nearby is infested with unspeakable horrors.

If I think about it this is really just a variation of when the local baron hires you to clear a forest of monsters before building a new village.

edit: typo