Well what I did was tear down my 24' x 30' with 7' ceiling garage and added 26' x 24' to the back and built new with 11' 6" ceilings.
One 18' x door in the front and one 8' x 8' door in the back with a service door on the side. I went with stick built construction because that is something that I did myself.I have a 9"x 12" roof pitch to allow for room to walk in the attic. 12' x 56' floored storage area.I installed a 8" x 12" x 24 I beam mounted on two post's and tied into the building for strength it is recessed into the ceiling so that the bottom of the beam is near level with the ceiling. I wish that I had gone 2' higher on the ceiling.I have stairs leading up to the attic and under that is my air compressor, I enclosed it to quiet it down.Air is piped throughout the shop. I also installed a 5 ton central AC. With a furnace in the attic.
I have drywalled and painted but have not yet epoxy coated the floor.Electrical power is 200 amp service for my Welder And equipment.I don't have any Pictures right now but if I did I would not post the because the place is a Mess.