You can go even tinier: http://www.amazon.com/Shafers-Book-Backyard-Sheds-Houses/dp/1565238168 http://www.amazon.com/Shafers-Book-Backyard-Sheds-Houses/dp/...

You can go even tinier: http://www.amazon.com/Shafers-Book-Backyard-Sheds-Houses/dp/1565238168 http://www.amazon.com/Shafers-Book-Backyard-Sheds-Houses/dp/... 100 to 120 square feet. And they are (or can be made) transportable.