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

Lake County does not publish a dedicated 'tiny home' ordinance. How a small dwelling is regulated depends on its form. A tiny house built on a permanent foundation is treated as a single-family dwelling or, where it meets the criteria, an accessory dwelling unit reviewed ministerially under California Government Code §65852.2 — meaning it must satisfy ADU size (150–800 sq ft), height, and setback standards and obtain a building permit under the California Residential Code. The County's AB 1332 pre-approved ADU plan materials state that a pre-approved plan may serve as a primary residence only if it meets the minimum size for a primary residence — 360 square feet — and includes a fire-suppression system, which is the closest published minimum-size figure for a very small permanent dwelling. A movable tiny house on a chassis (tiny home on wheels) is generally classified as a recreational vehicle and is not a permanent dwelling; its use is constrained by zoning rules on RV occupancy. Given the County's wildfire history, including the 2015 Valley Fire, fire-hardening and defensible-space requirements are particularly relevant to any small dwelling in a high fire hazard area. Owners should confirm the specific zoning district and whether the unit qualifies as an ADU before building.