I have a 900 sq foot shop/garage with 3 overhead doors and 2 steel walk-in doors. There are zero windows in the building. I had no problem passing inspection. To me, windows in a shop or garage are nothing more than access points for thieves. They never get washed, so soon they become a detraction to the appearance of the building. They do not offer enough light to work by, so you have to have a good lighting system anyway.