[Zman1969]

X2 on Fred, Charlies comments, I built a 30x30 and it filled up really fast if I had room I would of done 30x40 bit I didnt I did 10' ceiling that went to 12'6" in center for lift and my joists were engineered. You will want heat and air I really dont need heat as I insulated it well a 2 ton window unit does the job cooling it otherwise it would be useless from June till September here in Dallas. I used Rustoleum on the floor as I know there would be spills and it cleans up easy and no staining yes it gets scratched up but I work in it and if you do put some antiskid down with it cause when its humid or wet it can be sliprier than a whales ...

edit: and I thought i was overzealous with electrical outlets and I still had to add some more plugs for my surround sound, projector, door opener, grinder ect all ended up in one location so plan what your goiong to have and where your going to have it