19.47.020 Accessory structures.
A. Defined. A subordinate structure or building, the use of which is incidental and related to that of the main building or use on the same lot.
B. Accessory Structure Standards.
1. Form and Intensity Standards.
a. Height Limits.
i. Accessory structures in residential zones must not exceed 16 feet in height, as measured in AMC 19.42.120. The height limit for accessory structures with a roof pitch of 6:12 or greater is 20 feet.
ii. Accessory structures which include an accessory dwelling unit are subject to the height limits in AMC 19.47.030(C)(5).
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b. Size Limit. Accessory structures in all residential zones, except R1, must not exceed 1,000 square feet in size per building except when it includes an accessory dwelling unit (see AMC 19.47.030(C)(4)).
c. Setback requirements for all accessory structures are established in Tables 19.42.020 and 19.42.030, except:
i. Interior side setbacks for accessory structures:
(A) Three feet, for accessory structures no larger than 144 square feet and 12 feet in height.
(B) Five feet for other accessory structures.
ii. Rear setbacks adjacent to a platted alley:
(A) Zero feet for detached accessory structures or that portion of the primary structure that is used as an accessory structure. Exception: Where garage doors or a carport face the alley, the structure must be set back a minimum of 10 feet from the alley property line to allow adequate turning distance for vehicles.
(B) Detached accessory dwelling units (whether they are attached to a garage or freestanding) are subject to the setback standards in AMC 19.47.030.
iii. Rear setbacks not adjacent to a platted alley:
(A) Five feet for accessory structures no larger than 144 square feet and 12 feet in height.
d. Accessory structures associated with single-family dwellings, duplexes, and triplexes must be located to ensure that the minimum usable open space standards of AMC 19.43.010(C)(3)(c) are met.
2. Tent structures are considered accessory buildings, and may be located within side and rear setbacks, but not in a setback adjacent to a street. Tent structures must be constructed and maintained so as to not present a safety, health, or fire hazard.
3. Antennas erected after January 1, 1996, fall into two categories: (a) amateur radio service antennas and towers under 75 feet that require only a building permit, and (b) those higher than 75 feet that require a conditional use permit. Antennas and towers may not be located within the street or interior side setback areas, but may be located within the rear setback area.
4. Accessory buildings over 144 square feet in residential zones may not be corrugated metal sided. (Ord. 3040 § 2 (Att. A), 2019)