Building permits, zoning and land rules in Plumas County, California

Yes. Unincorporated Plumas County requires building permits and has adopted the California building, electrical, mechanical, plumbing and fire codes¹. Permit applications made in 2026 or later fall under the statewide 2025 California Building Standards Code¹⁵. Work performed under a Plumas County building permit must be inspected and approved by a county building inspector⁹. A Limited Density Rural Dwelling also needs a permit, approved plans, and Environmental Health approval of sewage disposal and potable water before issuance⁸. Plumas County publishes development-review and permit fees, but the total depends on the project and applicable reviews¹⁶. An owner-builder may qualify for a contractor-license exemption, but must sign the county declaration before the permit is issued¹³.

The Plumas County Building Department provides permit review and inspection services at 555 Main Street in Quincy; call (530) 283-7011 before submitting plans³. A complete submission with required documents, engineering, signatures, and planning and zoning requirements averages 2–4 weeks, while corrections and workload can add time³. Planning is a separate review at the same address and phone number; the Plumas County Planning Department handles parcel zoning, land-use and development requirements⁴. Start with Planning when the project depends on allowed use, setbacks, lot area or a combining zone, then coordinate construction documents with Building^10,17. Ask Building for a project-specific fee estimate; the county publishes development-review and permit fees¹⁶.

Plumas County zoning applies to unincorporated land; check the parcel's district and combining zones in the county GIS Map Portal^2,7. Inside Portola, the city administers its own zoning, while Plumas County Environmental Health oversees septic systems countywide^5,18. Residential minimum lot area and lot coverage vary by district¹⁰. In the districts covered by the county's residential table, front setbacks are 20 feet; side and rear setbacks are 5 feet per story for parcels under 1 acre and 30 feet for parcels over 1 acre, with a 35-foot height limit¹⁰. Unincorporated Plumas County allows ADUs where dwellings are permitted, subject to building standards and sewage approval; complete applications on lots with an existing dwelling require a decision within 60 days¹⁹. A qualifying statewide-exemption ADU may be up to 800 square feet and 16 feet high with 4-foot side and rear setbacks¹⁹.

Plumas County Environmental Health oversees onsite wastewater systems and holding tanks⁵. A county permit is required before a sewage-disposal system is installed, repaired, replaced or abandoned, and before qualifying construction or changes that require sewage disposal¹¹. Once a sewage disposal permit is issued, the installation must be finished within one year, with a one-time extension available⁵. Plumas County Environmental Health schedules septic and well inspections; an installed septic system must be approved before backfilling, and engineered or alternative systems also need a registered professional’s inspection^20,21. A qualifying occupied building within 200 feet of an approved public sewer must connect when right-of-way is available and the sewer manager certifies capacity¹¹. Off-grid sewage disposal is possible only with Environmental Health approval; cesspools and pit privies are unlawful, and holding vaults need special written permission¹¹. Call Environmental Health at (530) 283-6355 or visit 270 County Hospital Road, Suite 127, in Quincy²². Only about 1.5% of county soils are rated “not limited” for a conventional drain field, so obtain a site evaluation before purchase; the soil rating does not mean septic is impossible²³.

Private-land RV camping in unincorporated Plumas County is limited to 120 days per calendar year, with owner consent and compliance with county health rules; stays beyond 17 consecutive days require proper health and sanitation, such as well and septic hookups⁷. Camping is prohibited in Single-Family Residential, Multiple-Family Residential and the listed commercial districts, but allowed in districts including Suburban, Rural, General Agriculture and Timberland Production; confirm the exact parcel zoning with Planning before using an RV during construction^4,7. The permitted RV count also depends on the dwelling units, additional quarters and guest house allowed by zoning, minus those already on the property⁷. Plumas County treats a tiny home on wheels as an RV subject to those camping rules⁷. A foundation-built tiny home requires a county building permit and plans regardless of size, and must meet current zoning and construction standards¹².

1. Ask the Planning Department to confirm zoning, permitted residential use, lot standards and combining zones before design begins^4,10.
2. Determine sewage disposal and water early: Environmental Health handles septic and well review, and only a state-licensed, bonded C-57 contractor may drill the well^5,6.
3. Prepare a complete code-compliant submission and call the Building Department before scheduling delivery of plans and construction documents^3,15.
4. If acting as owner-builder, sign the county acknowledgment and declare the contractor-license exemption basis before permit issuance^13,14.
5. Obtain a Public Works permit for work in a county right-of-way; residential permits outside Local Response Areas also require a Fire Safe Driveway permit reviewed by Engineering^24,25.
6. Schedule and pass required inspections; a Limited Density Owner-Built Rural Dwelling receives a certificate of occupancy only after required inspections and approval^8,9.

Start with parcel zoning, minimum lot area, setbacks, lot coverage and the Flood Plain Combining Zone; Plumas County regulates floodplain development for reasonable safety from flood hazards, but applicability must be checked parcel by parcel^4,10. Obtain a septic site evaluation: only about 1.5% of county soils are rated “not limited” for a conventional drain field, which does not mean septic is impossible²³. Check the distance to public sewer because a qualifying occupied building within 200 feet must connect when right-of-way and certified capacity are available¹¹. Confirm well siting and access before closing; a new well needs county review and a permit, while driveway requirements depend on the road and fire-response area^6,24,25. A proposed single-family subdivision needs Tentative Map Review, including Zoning Administrator approval; the county lists an estimated 12-month total processing time¹⁰.