I had a local pole building place come in, put up the posts and the roof for quite affordable. I want to say maybe $8-10 a square foot.
Then as my own time and budget allowed every year, I slowly poured the concrete, closed in walls, pulled the electrical, lighting.
If you're going to build a roof, build a tall roof. Siding is cheap, Quality double steel insulated roll up doors aren't.
My high bay has 16 foot eves with 14x14 doors roughly 30 x 100 foot with lots of open bay space.
Show me someone who says "I built too big a shop" Liar.
