Compton, CA Accessory Structures: ADU Rules (2026)
ADU rules in Compton, CA, also called accessory dwelling unit regulations or granny flat ordinances, cover setbacks, owner-occupancy, parking, and permit requirements.
Key Facts
- Approval path
- Ministerial building permit, no hearing
- Detached ADU size
- 850-1,000 sq ft (1,200 in R-A)
- Detached ADU height cap
- 16 feet
- Setback
- 4 feet side and rear
- Parking
- 1 space per ADU, 5 listed waivers
- City review deadline
- 60 days
Summary
Compton's ADU ordinance, Section 30-11.2, lets homeowners build one accessory dwelling unit plus one junior ADU by right on any lot zoned for single- or multi-family use, ministerially approved through a building permit rather than discretionary review. Detached ADUs top out at 850 to 1,200 square feet depending on the zone and bedroom count, capped at 16 feet in height with 4-foot side and rear setbacks.
j. Standards for ADUs. Except for those ADUs approved pursuant to subsection b of this section ("Building Permit Approval Only"), ADUs shall comply with the following development standards: (a) Size Restrictions. Maximum Size. An Attached ADU that is proposed with a new Primary Dwelling or with a new multi-family structure shall not exceed 850 square feet in gross floor area for a studio or one-bedroom unit, or 1,000 square feet in gross floor area if more than one bedroom. A Detached ADU shall not exceed 850 square feet in gross floor area for a studio or one-bedroom unit, or 1,000 square feet in gross floor area if more than one bedroom. (b) Height Restrictions. A Detached ADU shall not exceed 16 feet in height, and an Attached ADU shall not exceed the height of the Primary Dwelling or proposed multi-family structure, unless the ADU is constructed above a garage, in which case the structure shall not exceed 30 feet. (c) Setbacks. The required minimum setback from side and rear lot lines shall be four feet.
Official source re-checked September 7, 2026: no newer edition of the code had been published (publisher’s edition: rev 4952997; v15 updated 2026-07-14; through 07-14-2026).
Full Breakdown
2 requires the city to 'ministerially approve an application for a building permit' for a qualifying ADU or JADU without a separate Planning Division application or discretionary hearing. j, a detached ADU built with a new primary dwelling may reach 850 square feet for a studio or one bedroom, or 1,000 square feet for two or more bedrooms; on a conforming lot in the R-A zone, that maximum rises to 1,200 square feet regardless of bedroom count, though total residential floor area on-site is then capped at 3,000 square feet.
Height is limited to 16 feet for a detached unit, while an attached ADU may match the primary dwelling's height or, if built above a garage, reach 30 feet. c sets the side and rear setback at four feet, with no setback required at all for an ADU built inside an existing structure. 3, but that requirement is waived if the unit sits within a half-mile of public transit, in a historic district, within a converted existing structure, in a permit-restricted parking area, or near a dedicated car-share space. g, and the Community Development Director's decision is final.
Violations & Fines
An ADU built without the required permit, or one that exceeds the size, height or setback standards of Section 30-11.2.j, is subject to the Municipal Code's standard enforcement path: correction through the Building and Safety Department or, absent voluntary compliance, the general penalty in Section 1-6.2 of up to $1,000, up to six months in jail, or both.
Frequently Asked Questions
Do I need a public hearing to build an ADU in Compton?
How big can a detached ADU be?
How close to my property line can I build?
How long does the city have to decide on my application?
Sources & Official References
Other rules in Compton
How Compton compares: Easiest Cities to Build an ADU·California rules heatmap·Compare Compton to another location·View the California accessory structures overview
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