Lassen County, CA Accessory Structures: Tiny Homes (2026)

Lassen County does not have a dedicated 'tiny home' ordinance, so the rules depend on the structure type. A tiny home built to the California Building Code on a permanent foundation is a dwelling and, on a parcel with a primary residence, can be permitted as an accessory dwelling unit under state ADU law (Gov. Code 66310-66342), which requires ministerial approval within 60 days and guarantees at least an 800 sq ft unit (a junior ADU is capped at 500 sq ft). A 'tiny house on wheels' is generally classified as a recreational vehicle or trailer rather than a permanent dwelling, and using an RV or trailer as a full-time residence is constrained by zoning and health/sanitation standards; rural agricultural parcels may allow temporary or caretaker situations under specific conditions, so verify with the county. Note that Chapter 9.32 of the Lassen County Code makes it unlawful to camp overnight on designated county property, with violations punishable as infractions (a fine not to exceed $100 for a first offense and $200 for a second or subsequent offense). The county has also considered camping-related ordinance updates. For a tiny home on private land, confirm whether your unit qualifies as an ADU, a manufactured home, or an RV with Lassen County Planning and Building Services.