We have a 40x50 with a 20ft wide door it serves us well we do not store stuff in it in the winter just run machines in a do what we need and move on to the next. We have had  2 8820s and a 8650  in  it at the same time  to work on just takes some planning and we have no office , air comprressor is in another building  and plumbed to shop and have a rolling work bench, cabinets and bolt bins mounted on the walls. .