I built a 50 x 60 steel shop back in 2004. I had it engineered for an overhead crane so that added some cost. I added floor heat in the concrete which turned out to be a great idea. The heated floors made that shop super comfortable to work in. I had it fully insulated which really helped to keep it comfortable. The electrical work was expensive. The building cost wasn't too bad but with the concrete work, insulation, interior paneling, etc. it all added up. But it was a fantastic place to work.