Ceres, CA Accessory Structures: ADU Rules (2026)
ADU rules in Ceres, CA, also called accessory dwelling unit regulations or granny flat ordinances, cover setbacks, owner-occupancy, parking, and permit requirements.
Key Facts
- Governing section
- § 18.28.060
- Approval type
- Ministerial, via building permit
- Detached ADU cap
- 1,200 sq ft, 1 story, 15 ft
- Attached ADU cap
- 50% of existing living area
- Zones allowed
- R-1, R-A, R-2, R-3, R-4, PC
Summary
Ceres allows accessory dwelling units on single- and multi-family lots through ministerial approval, capping detached units at 1,200 square feet and one story, and attached units at 50 percent of the existing living area.
The increased floor area of an attached accessory dwelling unit shall not exceed 50 percent of the existing living area.4.The total area of floor space for a detached second dwelling unit shall not exceed 1,200 square feet in size.5.The accessory dwelling unit shall conform to all height, setbacks (for an accessory structure), lot coverage, allowable density, architectural and site plan review, fees and charges, and other requirements as applicable to the zone district where it is located.6.A detached second dwelling unit shall be limited to one-story and shall not exceed 15 feet in overall height.7.The second dwelling unit/accessory dwelling unit shall comply with all applicable building, fire and other applicable health and safety code requirements.8.The second dwelling unit/accessory dwelling unit shall be subject to architectural review to ensure compatibility with the main living unit and surrounding dwelling units in terms of scale, height, and exterior design. The second living unit shall incorporate compatible architectural characteristics including roof pitch and style, window and door detailing, exterior materials, textures, colors, and finishes.9.The second dwelling unit/accessory dwelling unit may be occupied by a renter, but the unit shall not be independently sold. (Ord. No. 2020-1059, § 1, 3-23-2020)
Official source re-checked September 7, 2026: no newer edition of the code had been published (publisher’s edition: Municipal Code: Supplement 4).
Full Breakdown
Ceres Municipal Code § 18.28.060 lets homeowners add an ADU on R-1, R-A, R-2, R-3, R-4, and PC residential lots as a ministerial building-permit approval, not a discretionary hearing, once an existing primary dwelling is on the lot. An attached unit can't add more than 50 percent of the existing living area; a detached unit is capped at 1,200 square feet, one story, and 15 feet in height, and must meet the zone's setback, lot-coverage, and architectural-review standards. A renter can occupy the unit, but it can't be sold separately from the main house. State law under Government Code § 65852.2 sets minimum size and processing standards that override any stricter local limit.
Violations & Fines
Building an ADU without the required ministerial permit, or exceeding the size, story, or height limits without approval, is a zoning violation enforceable under Title 19's administrative citation and abatement process.
Frequently Asked Questions
Do I need a public hearing to build an ADU in Ceres?
How big can a detached ADU be in Ceres?
Sources & Official References
Other rules in Ceres
How Ceres compares: Easiest Cities to Build an ADU·California rules heatmap·Compare Ceres to another location·View the California accessory structures overview
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