Accessory buildings that exceed 200 square feet and any size two-story or more accessory building require a building permit.
Accessory buildings that are 200 square feet and less do not require a building permit; however, they are still subject to the regulations outlined in this handout (PDF).
The total square footage of a single accessory building cannot exceed 624 square feet, without a Special Use Permit. With a Special Use Permit the size could increase to 1,064 square feet. A building permit is required in addition to the special use permit. A building permit is required for any structure exceeding 200 sq. ft.
The total square footage of all accessory buildings on a lot cannot exceed 1,664 square feet - and cannot occupy more than 30% of the lot; this includes attached garages.
Accessory Buildings must be located in the rear yard and be setback at least 5 feet from the side and rear lot line.
Accessory buildings on a corner lot must be behind the home, setback 30 feet from the front and side property line.
Accessory buildings cannot exceed the height of the principal building (house).
All accessory buildings must be securely anchored to the ground by a foundation or by using anchoring tie-downs.
Hardcover cannot exceed 50% of the lot's area. Hardcover includes all structural footprint and non-structural hardcover (like a driveway).
More than one accessory building is allowed per property.
All accessory buildings over 200 square feet shall be architecturally compatible with the existing house and finished with complementary siding and color scheme.
The square footage of all buildings per property combined can not exceed 30% of the lot's area. Example: A 10,000-square-foot lot may only contain 3,000 square feet of structure footprint.