Lassen County, CA Accessory Structures: Shed Rules (2026)

Sheds and other detached accessory buildings on unincorporated Lassen County parcels are regulated under Title 18 Zoning. In the R-1 Single-Family Residential District, accessory buildings are limited in height to 20 feet or the height of the main building, whichever is lower, unless the architectural review committee approves a greater height (up to 35 feet). General provisions in Chapter 18.108 set design and placement standards, and section 18.108.235 establishes architectural standards (such as roof-overhang and siding requirements) for accessory buildings. In agricultural districts the setbacks are larger: in the A-2 Agricultural Residential District, accessory buildings used as guesthouses or farm outbuildings must be set back not less than 20 feet from any side or rear property line, not less than 50 feet from the front property line, and not less than 20 feet from any dwelling unit on the property. Whether a building permit is required generally depends on size and use under the California Building Code as adopted by the county. Because standards differ by zoning district and parcel, confirm the exact height, setback, and permit thresholds for your specific parcel with Lassen County Planning and Building Services before construction.