It is simple in Florida. A shed is a structure and you need a permit. It also has to meet the wind code so you need engineered/stamped plans. Those rubbermaid and sheet metal deals at the home store are not legal.
There is no such thing as a temporary shed.
Around here, a permit for a shed is only required if it is over 120 square feet or over 8 feet high. It then must either utilize some form of permanent footings or in the case of a pre-built unit, mobile home tie-downs at each corner are acceptable. When I had pulled a permit for mine, I had to explain to the inspector how these tie downs work since he had never seen them!
