It's a barn, really, but I use it as a shop. Wouldn't want to weld in there, but everything else is OK. After 2 years, about the only issue is that the flooring cupped, but that is because they laid the floor before the first snow, covered with visqueen, and finished in the spring. The cupping occurred then, and has been stable since. One day, when I am inspired, I'll take a power planer and smooth things out. Oil spills are good for the wood. AND the wood is a great surface to stand on all day while working. There are 2 (I think) center support footings spaced across the midline, else it is just around the walls.