5 rules for unincorporated Lake County, California.
Verified from official government sources
In unincorporated Lake County, ADUs are reviewed ministerially under California Government Code §65852.2. State standards cap an ADU at 800 sq ft (minimum 150 sq ft), allow up to 16 ft for a detached unit and 25 ft when attached, and require only 4-foot rear and side setbacks. One ADU is allowed per single-family lot, plus a JADU on owner-occupied parcels.
In unincorporated Lake County, a detached accessory structure such as a shed needs a building permit if it is over 12 feet tall OR larger than 120 sq ft; smaller, shorter sheds need only a zoning clearance. Setback and height requirements are set in Article 42 of the Zoning Ordinance, with separate setback exceptions for garages and carports.
Unincorporated Lake County allows conversion of an existing garage to an accessory dwelling unit under California Government Code §65852.2, which the County applies ministerially. State law bars the County from requiring replacement parking when a garage becomes an ADU, and the existing structure's setbacks are preserved for the conversion footprint. A building permit is still required.
In unincorporated Lake County, a carport that is over 12 feet tall or larger than 120 sq ft requires a building permit; smaller, shorter ones need only a zoning clearance. Carports and garages are subject to setback exceptions that are separate from those for other detached accessory structures, with the underlying setbacks set in Article 42 of the Zoning Ordinance.
Unincorporated Lake County has no standalone tiny-home ordinance. A tiny home on a foundation is treated as a dwelling or ADU under state law, and a pre-approved ADU plan used as a primary residence must be at least 360 sq ft with a fire-suppression system. A tiny home on wheels is generally regulated as an RV, not a permanent dwelling.
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