As far as working in existing structures, it all falls on the local AHJ.
For instance: I would not have to put smokes in any of the areas you mentioned. (Except that office/bedroom if bed area didn't already have one.) But I only need to add smokes if work is valued at $1000 or more. And only need to be hard wired and interlinked if scope of work includes open rock cieling in the area. Other-wise Batt. op's are OK. And if it is wide open for a full remodel, I only need to do Stairs, halls (15' or < for each BR), and the BR's themselves.
Botton line, its a quick call to the appropriate Inspector.
