Roof shed

This shed isn't particularly attractive but it comes with a very good idea: build your shed against an existing building. The one pictured here was built onto the back basement wall of a house. They built a second one on the adjacent wall around the corner. Very handy for gardening.

Benefits: You'll gain structural support and save on building costs due to the shared wall. Also, these long narrow sheds with wide doorways are great for making everything inside easily accessible. I see lots of sheds that are long and deep and it's a small battle just getting the lawn mower out!