5 rules for unincorporated Lassen County, California.
Verified from official government sources
On unincorporated Lassen County parcels, ADUs and junior ADUs are governed primarily by California state ADU law (Gov. Code 66310-66342), which preempts more restrictive local rules and requires ministerial approval within 60 days. The county's older 'second dwelling unit' use-permit standards (LCC 18.108.270) yield to state law.
Lassen County's Zoning Code (Title 18) regulates accessory buildings such as sheds by district. In the R-1 single-family zone, accessory buildings are limited to 20 feet (or the height of the main building, whichever is lower). Agricultural-zone outbuildings carry larger setbacks.
Converting a garage to living space in unincorporated Lassen County requires a building permit under the adopted California Building Code. When the converted space becomes an ADU, California state ADU law (Gov. Code 66310-66342) controls and conversions are favored - including a height-limit exemption for conversion ADUs.
A carport in unincorporated Lassen County is an accessory structure subject to Title 18 zoning standards (height and setbacks by district) and to a building permit under the adopted California Building Code. The county does not publish a separate carport-specific ordinance; the general accessory-building rules apply.
How a tiny home is treated in unincorporated Lassen County depends on its type. A tiny home on a permanent foundation can qualify as an ADU under California state law (Gov. Code 66310-66342). A tiny house on wheels is typically an RV/trailer and is restricted as such; overnight camping on county property is prohibited.
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