Accessory structures shall conform to the same property development standards as principal buildings except as required by this Section. Accessory buildings in Residential Districts shall include, but not be limited to, greenhouse and garden structures, storage sheds, workshops, garages, and other buildings that are detached from the principal building. Accessory structures in Residential Districts shall include, but not be limited to, unenclosed carports, gazebos, cabanas, or other similar structures; air conditioners, compressors, electric vehicle charging equipment, pool and spa filters, or other mechanical equipment; barbecues; sinks and counters; fountains; freestanding fireplaces; firepits; above ground swimming pools and spas; and other structures with a fixed location that are detached from the principal building. Accessory structures greater than 14 feet in height are not permitted. Accessory structures shall be erected, structurally altered, converted, enlarged, moved, and maintained, in compliance with the following regulations:
A. Relation to Principal Buildings. An accessory building may only be constructed on a parcel with a legally-permitted principal building. Except as may be provided under Santa Monica Municipal Code 6.20, Home-Sharing and Vacation Rentals, or for accessory dwelling units established in compliance with Section
9.31.025, Accessory Dwelling Units and Junior Accessory Dwelling Units, of this Code, an accessory building shall be considered part of the principal building if the accessory building is located less than four feet from the principal building or if connected to it by fully enclosed space.
B. Dwelling Units in Accessory Buildings. An accessory building on a parcel occupied or proposed to be occupied by a single-unit or multiple-unit detached dwelling may only be used as a separate dwelling unit in compliance with the requirements of Section
9.31.025, Accessory Dwelling Units and Junior Accessory Dwelling Units.
C. Accessory Buildings and Structures up to 14 Feet in Residential Districts. Accessory buildings and structures not more than 14 feet or one story in height shall conform to the following standards:
1. Location.
a. Accessory buildings shall be located on the rear half of the parcel and shall not extend into the minimum side yard setback except as authorized pursuant to subsections
(b) and
(c) below.
b. Accessory buildings no more than 14 feet in height may be located in the rear setback but shall be located at least 5 feet from the rear parcel line. A garage or garage portion of such an accessory building may extend up to one interior side parcel line within the rear 35 feet of a parcel.
c. A garage or garage portion of an accessory building may extend to the rear parcel line abutting an alley, provided that vehicle access is not taken from the alley. Where vehicle access is taken from an alley, garages shall be set back at least 5 feet from the rear parcel line abutting said alley.
d. Accessory buildings may be located in the rear setback and shall be located at least 15 feet from the centerline of a rear alley.
e. Accessory structures shall not be located within any front or minimum side setback except as expressly authorized below:
i. Fountains, fire pits, and similar ornamental landscape features not to exceed 42 inches in height.
ii. Underground mechanical equipment.
iii. Electric vehicle charging equipment shall be permitted within any minimum side setback but shall not be permitted within any minimum front setback.
2. Dimensions.
a. On a reversed corner parcel, accessory buildings shall not be located nearer to the street side parcel line of such corner parcel than one-half of the front setback depth required on the key parcel, nor be located nearer than 5 feet to the side parcel line of any key parcel.
b. Any accessory building on a through parcel shall not project into any front setback and shall not be located in any minimum side setback.
3. Sloped Parcels.
a. Where the elevation of the ground at a point 50 feet from the front parcel line of a parcel and midway between the side parcel lines differs 12 feet or more from the curb level, a private garage, not exceeding one story nor 11 feet in height for a flat roof and one story nor 14 feet in height for a pitched roof, may be located within the required front setback, provided that every portion of the garage building is at least 5 feet from the front parcel line and does not occupy more than 50% of the width of the front parcel line.
b. In all OP Districts, a garage or garage entrance on a parcel with an existing grade differential of 10 feet or more between the midpoint of the front parcel line and the midpoint of the rear parcel line may be set back a distance equal to the average garage setback of adjacent garage(s), but not less than 5 feet, when the interior garage width does not exceed 20 feet and the height does not exceed 11 feet for a flat roof and 14 feet for a pitched roof.
D. Accessory Buildings Over One Story or 14 Feet in Residential Districts. Accessory buildings that exceed 14 feet or one story in height shall conform to the following standards:
1. Maximum Floor Area. The total floor area of an accessory building that exceeds 14 feet or one story in height shall not exceed 650 square feet including any area approved for use as a garage. No accessory building shall have a second floor that exceeds 250 square feet in size. Accessory dwelling units are exempt from this requirement pursuant to Section
9.31.025, Accessory Dwelling Units and Junior Accessory Dwelling Units.
2. Maximum Building Height. The accessory building shall not exceed 2 stories or 24 feet in height.
3. Setbacks. The accessory building shall conform to all setback requirements of the Residential District and the following requirements:
a. A one-story garage or the garage portion of an accessory building may extend into the rear setback and may extend to one interior side property line on the rear 35 feet of a parcel.
b. The accessory building shall have the same minimum side setback requirement as the principal building on the parcel, but in no case less than 5 feet.
c. The second story portion of an accessory building that is directly above the garage may extend into the required rear setback but shall be no closer than 5 feet from the rear property line, and may not extend into any minimum side setback.
E. Exterior Features. In the Single-Unit Residential (R1) District, first-story roof decks, landings, upper level walkways, and balconies on accessory buildings, not including accessory dwelling units, shall not exceed 35 square feet in area and must be set back at least 25 feet from the side property line closest to the structure, and at least 25 feet from the rear property line. Roof decks above the second story are prohibited.
F. Design Compatibility. The architectural design of the accessory building shall be compatible with the design of the principal dwelling and surrounding residential development in terms of building form, materials, colors, and exterior finishes.
G. Kitchen. The accessory building shall not contain a kitchen unless specifically permitted as an accessory dwelling unit pursuant to Section
9.31.025, Accessory Dwelling Units and Junior Accessory Dwelling Units.
H. Full Bath. The accessory building may contain a sink, toilet, and a shower and/or tub.
I. Renting. Except as may be permitted under Santa Monica Municipal Code 6.20, Home-Sharing and Vacation Rentals, no accessory building shall be rented for any purpose or otherwise used as an accessory dwelling unit unless specifically pursuant to Section
9.31.025, Accessory Dwelling Units and Junior Accessory Dwelling Units.
(Added by Ord. No. 2486CCS §§ 1, 2, adopted June 23, 2015; amended by Ord. No. 2536CCS § 9, adopted February 28, 2017; Ord. No. 2624CCS § 4, adopted November 12, 2019; Ord. No. 2649CCS § 22, adopted September 8, 2020; Ord. No. 2742CCS § 2, adopted April 11, 2023; Ord. No. 2792CCS, 10/8/2024; Ord. No. 2814CCS, 5/27/2025)