A permit is required for any building 120 square feet or larger. Small garden or storage sheds less than 120 square feet do not require a permit; however they must be placed on a concrete slab for rodent protection. In addition, the shed must be placed a minimum of 3' from side and rear property lines and 10' from the principal building.
Sec. 90-311 Accessory Buildings and Uses
Accessory Structure Zoning Ordinance