5 rules for unincorporated Plumas County, California.
Verified from official government sources
Unincorporated Plumas County adopted a dedicated ADU ordinance (Zoning Code Article 45, Secs. 9-2.4501 through 9-2.4508) implementing California state ADU law (Gov. Code 66310-66342). ADUs and junior ADUs are approved ministerially by the Building Department within 60 days, with no public hearing.
In unincorporated Plumas County, a building permit is generally required for a detached storage shed once it exceeds 120 square feet. The Building Official may issue a special 'no-fee permit' for tool and storage sheds over 120 but not more than 200 square feet (County Code Sec. 8-1.08), excluding any plumbing, electrical, or mechanical work.
Converting a garage to living space in unincorporated Plumas County requires a building permit. Plumas County Code Sec. 9-2.408(a) provides that no setback is required for an existing garage converted to an ADU, and conversion ADUs are processed ministerially under Article 45 and California state ADU law.
Plumas County Code Sec. 9-2.408(c) sets carport placement standards: carports must be no closer than 30 feet from the center line of the street (less on certain lower-class roads), need not be set back farther than the zone's minimum front yard, and may not extend beyond the front line. The roof may not shed onto the road right-of-way.
Plumas County treats a tiny home on wheels (THOW) as a recreational vehicle, not a permanent dwelling. Per the county's own FAQ, it cannot be lived in year-round; RV/camping use is limited to no more than 120 days per calendar year. A foundation-set 'park model' tiny home may instead qualify as a permitted ADU.
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