Accessory Structures in Placer County, CA (2026)

2 county-level rules, plus city-specific rules for 1 city in Placer County, California.

Verified from official government sources

Note: These county rules apply to unincorporated areas of Placer County. If you live within an incorporated city, that city's own rules apply — see the city list below.

ADU Rules

Placer County Code Sections 17.56.095, 17.56.180, and 17.56.200 allow one Accessory Dwelling Unit (ADU) and one Junior ADU (JADU) on each residentially zoned parcel, in addition to the primary dwelling. Detached ADUs may be up to 1,200 sq ft; JADUs are capped at 500 sq ft.

Placer County ADU Rules

Few Restrictions

Full ordinance details →Official source ↗

Shed Rules

Under California Building Code §105.2 (adopted by Placer County Code Chapter 15) and Placer County Code 17.56.020, one-story detached storage sheds, playhouses, and similar accessory structures up to 120 sq ft and 12 feet in height do not require a building permit, but must still meet zoning setbacks. Electrical or plumbing work requires permits.

Placer County Shed Permit Rules

Few Restrictions

Full ordinance details →Official source ↗

Accessory Structures by City in Placer County

1 cities in Placer County have their own accessory structures rules. Each link goes to that city's dedicated page with code citations.

Roseville

9 verified rules • ADU Impact Fees, ADU Owner Occupancy

All Placer County ordinances

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