My shop is part of my pole barn style garage. I had them extend it 8' off the garage when it was built. Its to small. My dream is to one day build a shop about 24'x24'. I have some ideas for it; a wood stove for free heat, a vise securely mounted on a post in the floor for debarking staves, lots of outlets, and targets set in one corner to allow indoor shooting.
When you start building your shop take lots of pictures and keep us updated.