Massachusetts cost per sq/ft for skim coating and painting

[Matt Charette]

Hey folks, I’m in the process of a DIY live in flip. I’ve already fully renovated one bedroom top to bottom. I still have about 700-1000 square feet of rooms with wallpaper that needs to be removed, repaired, skimmed and painted. I’m going to remove all the wallpaper myself at my own pace, in the process now, but I’ve got a lot of large wall cracks I want to make sure it’s done right and doesn’t resurface before I sell. I also realize that range is wide, which brings me to my questions. 

I have a lot of walls in my home, it’s not very open. When contractors ask how much square feet needs to be done what figure is that coming from, the square footage on the walls them selves or the size of the room itself?

I don’t want to skimp on quality, but what is a fair or expected range in the Stoughton area? (South of Boston) 

Any referrals would be appreciated also!