ADU rules in Orange, CA — also called accessory dwelling unit regulations or granny flat ordinances — cover setbacks, owner-occupancy, parking, and permit requirements.
The City of Orange regulates accessory dwelling units under OMC Chapter 17.29, consistent with California Government Code Section 65852.2. Detached ADUs up to 850 sq ft (one bedroom) or 1,000 sq ft (two+ bedrooms) are permitted on single-family lots via ministerial building permit.
Under OMC Section 17.29, one ADU is permitted per single-family lot. Detached ADUs must maintain 4-foot side and rear setbacks and may not exceed 16 feet in height. No ADU with fewer than two bedrooms may exceed 850 square feet, and no ADU with two or more bedrooms may exceed 1,000 square feet, except conversions of existing structures. One parking space per ADU or per bedroom (whichever is less) is required unless the property is within one-half mile of public transit. JADUs up to 500 square feet are also permitted within existing single-family dwellings. Garage conversions are exempt from replacement parking requirements per state law.
Constructing an ADU without a building permit subjects the property owner to code enforcement action, stop-work orders, fines, and potential required demolition or retroactive permitting with penalty fees.
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Side-by-side rule comparisons with other cities in Orange County.
See how other cities in Orange County handle adu rules.
See how Orange's adu rules rules stack up against other locations.
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