Shasta County

Shasta County Department of Resource Management / Planning Division issues ADU permits for unincorporated parcels including Cottonwood, Palo Cedro, Bella Vista, Burney, Fall River Mills, McArthur, Round Mountain, Lakehead, French Gulch, Igo, Ono, Whitmore, and Shingletown. Practical permitting frictions: extensive CAL FIRE State Responsibility Area covering most of the county outside the Sacramento Valley floor and the immediate Redding metro - the 2018 Carr Fire (the most destructive structure event in county history; ~1,604 structures destroyed in Shasta County) and the 2024 Park Fire (the largest California fire on record at the time of publication; southern Shasta County footprint) reshaped WUI evacuation and Chapter 7A enforcement; FEMA SFHA along the Sacramento River, Cottonwood Creek, Battle Creek, Pit River, McCloud River, and Clear Creek; the Shasta Lake / Lake Shasta reservoir shoreline (federal Bureau of Reclamation jurisdiction with USFS and CA State Parks lease frameworks); the Whiskeytown National Recreation Area on the western edge of Redding (NPS, ~42,500 acres severely burned in Carr Fire); Lassen Volcanic National Park territory east; volcanic / geothermal hazard zones around Mt. Shasta vicinity (the Mt. Shasta volcano itself is in Siskiyou County but volcanic-hazard advisory zones extend); and rural well-water / septic considerations across most non-municipal parcels.

Process overview: Standard ministerial 60-day review per Sec. 65852.2(b) for compliant ADU applications outside Very High FHSZ. Within Very High FHSZ (most of the rural county outside the Sacramento Valley floor and the immediate Redding metro), Chapter 7A ignition-resistant construction, PRC 4291 defensible space, and CAL FIRE driveway/turnaround review apply. Carr Fire and Park Fire rebuild parcels qualify for expedited replacement-permit pathways with comparable-utility base-year-value retention and disaster-relief reassessment. Shasta Lake shoreline parcels require Bureau of Reclamation lease/easement coordination (the lake itself is federal). Whiskeytown NRA inholdings carry severe access constraints. Septic-suitability evaluation by Environmental Health is required where no public sewer (the bulk of unincorporated parcels).

Impact fees: SB 13 fee waivers apply to ADUs under 750 sqft (no impact fees). CAL FIRE driveway/defensible-space inspection fees apply on most rural parcels. Septic permits required on rural parcels. School-district fees per Education Code Sec. 17620 on ADUs over 500 sqft (multiple small districts: Cascade Union Elementary, Anderson Union HSD, Gateway Unified, Burney/Fall River Joint USD, Shasta Union HSD, Pacheco Union ESD, etc.). Insurance-availability constraints in FHSZ areas (post-Carr, post-Park) materially affect ADU construction-loan financing even when the county permit issues without friction.

The Shasta County Assessor / Recorder maintains parcel-level assessment records for the entire county. ADU additions on unincorporated parcels are captured as improvements via shared permit data with Resource Management. California Proposition 13 caps base-year valuation increases at 2 percent per year on the existing structure; new improvement value (the ADU) is added as a separate line item assessed at fair market value at completion. Williamson Act parcels (some rural ag in the Sacramento Valley floor and the Fall River Valley) carry agricultural use-value assessment under Sec. 423 of the Revenue and Taxation Code. Carr Fire and Park Fire impacted parcels qualified for Cal. Rev. & Tax. Code Sec. 170 calamity reassessment downward to reflect destruction, and Prop 50 / Prop 171 / Prop 19 disaster-relief base-year-value transfer for replacement structures of comparable utility (rebuild within 5 years).

Assessment policy: ADU improvement value is added on the next regular revaluation cycle following completion. Per Prop 13, the ADU's value is taxed at 1 percent of fair market value at completion (plus voter-approved local rates), while the existing structure remains at its base-year value plus the 2 percent annual cap. Conversion ADUs (within existing structure) typically generate smaller incremental assessments than detached new construction. Carr Fire and Park Fire rebuild parcels: replacement structure of comparable utility carries the pre-fire base-year value; an ADU added during rebuild that exceeds comparable-utility floor area is assessed at fair-market new-construction value for the excess.

Shasta County overlays of consequence: CAL FIRE State Responsibility Area Very High FHSZ across most of the rural county (the Cascade Range foothills, the Trinity Alps periphery, the Mt. Lassen vicinity, and the Pit River canyon); 2018 Carr Fire burn footprint (~229,651 acres total; ~1,604 structures destroyed in Shasta County, primarily west Redding and the Whiskeytown / Igo / Ono corridor); 2024 Park Fire burn footprint (~429,603 acres total across multiple counties; southern Shasta County extension); Whiskeytown National Recreation Area (~42,500 acres NPS, severely burned in Carr Fire and progressively reopening); Lassen Volcanic National Park (NPS); Lassen National Forest, Shasta-Trinity National Forest (the second-largest national forest in California); Bureau of Reclamation Shasta Dam / Lake Shasta / Lake Shasta National Recreation Area; the Trinity Alps Wilderness periphery; FEMA SFHA along the Sacramento River, Cottonwood Creek, Battle Creek, Pit River, McCloud River, Clear Creek; volcanic and geothermal hazard advisory zones near the Mt. Shasta vicinity (volcano in adjacent Siskiyou County but advisory zones extend); the Pit River Tribe (Ajumawi-Atsugewi Nation) and Redding Rancheria (Wintu / Yana / Pit River) tribal-trust lands and AB 52 / SB 18 consultation overlays; rural well-water / septic on most parcels.

• CAL FIRE State Responsibility Area / Cascade and Trinity foothills Very High FHSZ
• 2018 Carr Fire rebuild zone
• 2024 Park Fire rebuild zone (southern Shasta County extension)
• Whiskeytown National Recreation Area / Lassen Volcanic National Park
• Shasta Dam / Lake Shasta - Bureau of Reclamation
• Shasta-Trinity National Forest / Lassen National Forest
• FEMA SFHA - Sacramento River, Cottonwood Creek, Battle Creek, Pit River, McCloud River, Clear Creek
• Cascade volcanic-hazard advisory zone (Mt. Shasta / Lassen Peak vicinity)
• Redding Rancheria / Pit River Tribe (Ajumawi-Atsugewi Nation) - tribal-trust lands and consultation