ADU rules in Yorba Linda, CA — also called accessory dwelling unit regulations or granny flat ordinances — cover setbacks, owner-occupancy, parking, and permit requirements.
Yorba Linda permits accessory dwelling units ministerially under Zoning Code Chapter 18.20, Article IX (Sections 18.20.800–880), implementing California ADU law. A qualifying ADU is approved with only a building permit, no discretionary hearing, if it meets the article's standards.
Under Chapter 18.20, Article IX, an application consistent with the article is processed as a ministerial action requiring issuance of a building permit (Section 18.20.820). Detached ADUs may not exceed 16 feet in height and must maintain a minimum four-foot side and rear setback (Section 18.20.850). Size limits are 850 sq ft for a studio or one-bedroom and 1,000 sq ft for larger units; the Planning Commission may approve up to 1,200 sq ft through Design Review on lots of at least 15,000 sq ft. One parking space is required but is waived within one-half mile of transit or for conversions. Consistent with state law, owner-occupancy is not required for standard ADUs; a junior ADU still requires owner occupancy.
Building an ADU without the ministerial permit, or exceeding the article's size, height, or setback standards, is a zoning violation subject to correction, stop-work, and code enforcement penalties under the Yorba Linda Municipal Code.
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