The at home mechanic needs a place to work. Ideally this place to work is covered, well lit and protected from the elements. It should also have a place to store tools and parts in an organized manner and it should be secure so that big jobs can be wrapped up at night for a second day's effort.
My garage is a detached "two car" garage from the 1930's with a cement floor at the back of my property, well removed from view from the street. Measuring approximately twenty by twenty, it is barely able to contain my project car (currently a 1987 Honda CRX Si), my tools, my work bench and all the flotsam and jetsam that a suburban homeowner stores in his garage. I have lined the side and back walls with shelving so that I store my junk in a rough form of organization and my car is parked in the middle of the garage with just enough room around it to do my work.
In an ideal world I would have a warehouse sized garage with room for a lift, a paint booth and a office with a desk. I don't need an office or a desk in my garage, but as long as I am wishing...
My current garage does have two absolutely vital accessories. I have a radio and a TV in the garage so that I can keep track of the ball game, listen to tunes or track the rants on talk radio when I am wrenching on my car . While I enjoy the hours spend tinkering in the garage, a little subliminal entertainment in the background helps to pass the time pleasantly.
And the other vital component of my garage is the full sized refrigerator. This second refrigerator allows the household the luxury of additional cold storage and it keeps the cold malted beverages close at hand.
While you are working with tools, the possibility of injury is always present so save the cold malted beverages for after the work is done. But nothing caps a successful session in the garage like a refreshing cold malted beverage enjoyed in a responsible manner.