Yorba Linda, CA Accessory Structures: ADU Rules (2026)
ADU rules in Yorba Linda, CA, also called accessory dwelling unit regulations or granny flat ordinances, cover setbacks, owner-occupancy, parking, and permit requirements.
Key Facts
- Guaranteed minimum ADU
- 800 sq ft, 4-ft side/rear setbacks
- Detached ADU height
- 16 ft (18 ft near transit)
- Attached ADU height
- 25 ft, max two stories
- Size cap, detached
- 1,000 sq ft (1,200 via Design Review)
- Parking
- 1 space, often waived
- Application review
- Ministerial, 60-day decision
Summary
In the City of Yorba Linda, every residential lot may build at least one 800-square-foot accessory dwelling unit with four-foot side and rear setbacks, capped at 16 to 25 feet in height depending on type and transit proximity. Detached ADUs generally max out at 1,000 square feet unless attached and tied to the primary home's size.
A. The following standards and criteria shall apply to all proposed accessory dwelling units. Notwithstanding these requirements, all residential lots shall be permitted to develop at least one 800 square foot attached or detached accessory dwelling unit that maintains side and rear yard setbacks of at least four feet and complies with the following height limits: 1. 16 feet for a detached ADU on a lot with an existing or proposed single-family or multi-family dwelling unit. ... 4. ... 25 feet for an attached ADU; however, such ADUs are limited to no more than two stories in height. ... ... D. Size Limitations. 1. Accessory dwelling units shall not exceed 1,000 square feet in size; however, attached accessory dwelling units may exceed these size limitations provided that they do not exceed 50 percent of the existing primary dwelling's living area square footage and shall not exceed one bedroom for ADUs which are 750 square feet or less and shall not exceed three bedrooms for ADUs more than 750 square feet;
Full Breakdown
Yorba Linda Municipal Code § 18.20.850 sets the baseline development standards for accessory dwelling units citywide. Subsection A guarantees every residential lot the right to build at least one 800 square foot attached or detached ADU with four-foot side and rear yard setbacks, and sets height caps by type: 16 feet for a detached ADU on a lot with a single-family or multi-family dwelling, 18 feet if that lot sits within one-half mile of a major transit stop or high-quality transit corridor (plus up to two more feet for a matching roof pitch), 18 feet on a lot with an existing multi-family, multi-story dwelling, and 25 feet for an attached ADU, though attached units are capped at two stories.
Subsection C ties height, setback, building separation, landscaping and lot coverage to the standards of the underlying zoning district, and folds the ADU's footprint into that zone's overall lot coverage limit alongside the main residence and any garage. Subsection D limits detached ADUs to 1,000 square feet, though an attached ADU may exceed that if it stays under 50 percent of the primary dwelling's living area, with a one-bedroom cap for ADUs of 750 square feet or less and a three-bedroom cap above that. The Planning Commission can approve up to 1,200 square feet through Design Review on lots of at least 15,000 square feet.
Subsection E requires only one parking space, often waived near transit, in a historic district, or when a garage converts to an ADU. The Community Development Director acts ministerially on complete applications within 60 days under § 18.20.820.
Violations & Fines
An ADU built outside these standards, or without the required building permit under § 18.20.820, is a Municipal Code violation subject to the citywide general penalty at § 1.12.010: a misdemeanor fine up to $1,000 and up to six months in jail, or both, or prosecution as an infraction carrying a $100 fine for a first offense and $200 for a second within 12 months, enforced by the Yorba Linda Building Official and Community Development Department.
Frequently Asked Questions
How tall can an ADU be in Yorba Linda?
Is every lot in Yorba Linda guaranteed an ADU?
Does an ADU need a discretionary permit in Yorba Linda?
Sources & Official References
Other rules in Yorba Linda
How Yorba Linda compares: Easiest Cities to Build an ADU·California rules heatmap·Compare Yorba Linda to another location·View the California accessory structures overview
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How other cities in Orange County handle adu rules.