You may want a garage door if you will need to access your shop with large workpieces or tools, or if you or future owners will ever want to use the space to park a vehicle. Garage doors are notoriously drafty, however, so if you think you can live without one you will probably be warmer. Instead, you could opt for out-swinging double doors. In a small shop you can, at a pinch, rip longer lengths of lumber by feeding the material out of either a strategically placed door or window.
Unless you’re a big fan of frequent shop remodeling, planning the layout of your workshop early in its development will save you a lot of time and trouble and also can keep you from spending years in an uncomfortable, poorly organized space. And if you already work in a shop that’s as organized as a trailer park after a tornado, careful planning and a little remodeling is likely to help you make a quantum leap.