Yuba County, CA Accessory Structures: ADU Rules (2026)
ADU rules in Yuba County, CA, also called accessory dwelling unit regulations or granny flat ordinances, cover setbacks, owner-occupancy, parking, and permit requirements.
Key Facts
- Detached size cap
- 850 sq ft (1BR) / 1,200 sq ft
- Max height
- 16 feet for new structures
- Setbacks
- 4 ft side/rear minimum
- Approval process
- Ministerial building permit, no CUP
- State law
- Gov. Code §§ 66310-66342 overrides conflicts
Summary
Unincorporated Yuba County allows detached accessory dwelling units up to 850 square feet for one bedroom or 1,200 square feet for more, capped at 16 feet in height, approved ministerially under state ADU law.
No minimum size, except as needed to conform with the requirements for an efficiency unit, as defined in the Building Code. A detached accessory dwelling unit shall not exceed 850 square feet for a one-bedroom unit or 1,200 square feet for an accessory dwelling unit that provides more than one bedroom. The living area includes all conditioned and unconditioned space in the detached accessory dwelling unit.c.Setbacks.1.Front yard setback: Per the zoning district standard for the primary dwelling.2.Side yard: Four feet minimum.3.Rear yard: Four feet minimum.d.Height. 16 feet for new structures built specifically as an accessory dwelling unit.
Official source re-checked September 7, 2026: no newer edition of the code had been published (publisher’s edition: Code of Ordinances: Supplement 6).
Full Breakdown
Section 11.32.030 processes ADUs through a ministerial building-permit review rather than discretionary planning approval, 'consistent with state law,' and no other planning-related permit is required. Detached ADUs have no minimum size but cannot exceed 850 square feet for a one-bedroom unit or 1,200 square feet for a unit with more than one bedroom, per Section 11.32.030(h)(1)(b), and new detached ADU structures are capped at 16 feet in height. Side and rear setbacks are a four-foot minimum. Because state ADU law (Gov. Code Sections 66310-66342, formerly Section 65852.2) sets minimum size and processing floors that override conflicting local limits, the County's own limits control only where they are at least as permissive as the state standard.
Violations & Fines
An ADU exceeding the size or height caps, or approved through anything but the ministerial building-permit process, is subject to code enforcement under Section 11.32.030(k) and Chapter 11.67.
Frequently Asked Questions
Do I need a use permit to build an ADU in unincorporated Yuba County?
How big can a detached ADU be?
Sources & Official References
Other rules in Yuba County
How Yuba County compares: Easiest Cities to Build an ADU·California rules heatmap·Compare Yuba County to another location·View the California accessory structures overview
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