Also you might be able to add a 2nd floor if the footing can support it, if it's a problem of not enough square footage...that may be cheaper than a tear down but probably not if it is really old or in bad shape...

All carpets were replaced and wall / ceiling paint and floor sealer.

These issues (and flooring problems) added almost a month-and-a-half in delays.  

It will also require a new HVAC, as it currently has just a floor radiant heater.  

Flooring, painting, drywall repair, etc. shouldn't need any permits.Anything that needs a license (HVAC, new electrical circuits, new plumbing, etc) or larger changes (like roof or siding replacement) is typically going to need one.

I've recently replaced the floor and the drywall in the bathroom and don't want to have to rip it up if i don't have to.So I bought a 12" rough in toilet not knowing the different(noob).

My family lives there so, for now, we're staying on the third floor of my parents' house (staying with your parents in your 40s, weeee!)

I want to develop a small commercial building on the ground floor and put apartments on the second and third floor of the land that he owns.  

The floor in the hallway, one bedroom and kitchen is still a subfloor.

It needs cabinets, countertops, tile floor, and paint.