Door sizes should be at least 9 wide by 8 foot tall minimum. I have two doors in my shop, one is 18 wide by 12 tall, and a 10 by 8. You should also have at least one good sized window for some ventilation and natural light.
John
~ J Lucas 2006 GMC Envoy 4.2 I6 2023 Ram 2500/Cumins 6.7 I6 2010 Jeep Grand Cherokee (Wife’s) 2002 Silverado 2500 Gas 6.0 1941 Chevy 1/2-Ton 1942 Chevy 1.5-Ton SWB In the Gallery My Flicker Photos!