Let's see, how much of the car hangs out the back when it's on the hoist? and along those lines, give yourself some extra room. You will want to put a pick up or even a trailer on the hoist sometime to work on it. You are going to want some walk around room behind the car when it is on the floor as well. You don't necessarily want a extra car space behind the hoist. It's kind of a waste of space. My buddy put his hoist in the front of the shop so it was close to his tool box, bench space, air compressor, water hose, and floor drain. Something else to think about.
