Thanks guys. As I mentioned this isn't a rental or I wouldn't really care too much as long as it was clean. I do higher end flips even in C class neighborhoods. I already know I'm going to have to make a lot of holes for rewiring/plumbing/hvac/repairs. I've only ever put drywall over drywall on the ceiling because of severe smoke damage (no smell nice and clean). However, I haven't done it over walls. I was planning on doing all the drywall myself so just materials maybe $1500 most on such a small house. I'm not a local in this area and I'm trying to get references but I find it so difficult like most to find expert fair priced contractors so for the time I wait and twiddle my thumbs I rather just do it myself in the same time I don't flip tons of homes.
I guess I'll know soon but will try to get a quote for just repair/skimming first but if its more than what I can do it for just demo and redo I'll likely pass for a brand new home look because everything going to be replaced anyway. Theres not much charmer or in this home just a simple bungalow.
Thanks again.