ADU rules in Yuba City, CA — also called accessory dwelling unit regulations or granny flat ordinances — cover setbacks, owner-occupancy, parking, and permit requirements.
Yuba City's ADU Ordinance No. 006-22 (adopted March 15, 2022) is codified in Title 8, Chapter 5, Article 50 of the Zoning Ordinance and permits ADUs in any zone allowing single-family or multifamily residential use.
Under Yuba City Zoning Ordinance Article 50 (Title 8, Chapter 5), ADUs may be attached, detached, or created through conversion of existing legal space on a single-family or multifamily lot. Every ADU must have a separate exterior entrance, a kitchen (sink, counters, cabinets, refrigerator, stove), and a sanitation facility (sink, toilet, shower/tub). Detached ADUs may be up to 1,200 sq ft; attached ADUs may be up to 50% of the primary dwelling or 1,200 sq ft, whichever is less. On multifamily lots, up to two detached ADUs are permitted at a maximum of 800 sq ft with 4-foot side/rear setbacks and 16-foot height to peak. Yuba City's ordinance must be read together with California Government Code §65852.2 (SB 9/SB 10 framework), which preempts more restrictive local rules. HCD's December 27, 2023 review letter found several provisions of Ord. 006-22 noncompliant with state ADU law and required amendments on minimum-size and parking provisions.
Building or occupying an ADU without permits is a zoning violation under Yuba City Municipal Code. Standard zoning enforcement applies: written notice, opportunity to cure, and administrative citations under Title 1 of the Municipal Code with daily fines for continuing violations. Unpermitted ADUs may not be legally rented and may be ordered removed or brought into compliance.
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