I am in the process of adding about 20x16 to the back of our 2-car garage (lower left side of the image). Few reasons for the design:
- The addition will add enough length to park two cars in tandem. The idea is that the new space is for working on and housing a project.
- Even though I could have used more space, the addition is only a "1.5 car". I didn't want to add another complete spot because it would make a long wall facing the house that would feel too much like an alley. As you asked about in another thread, we're trying to match the style of the house and garage. If you know about mid-century modern houses, some (like the Eichlers in Calif.) have enclosed courtyards and we're trying to mimic that idea.
- The building will provide some privacy from the neighbor and help to create a courtyard because our house has large floor-to-ceiling windows facing the yard.
It may turn out that the tandem parking is a major pain, but I don't imagine needing to swap positions too frequently because neither of the cars that will be stored there will be daily drivers - that's what the 3rd spot is for.