ADU Pass
Del Norte County
ADU Pass helps homeowners in Del Norte County, California navigate the permit paperwork for building an accessory dwelling unit. We cover 4 cities and 4 ZIP codes in this county.
Map
County ADU details
County ADU ordinance
Del Norte County (population ~28,000) is California's northwesternmost county, abutting Oregon to the north and the Pacific Ocean to the west. The county seat and only incorporated city is Crescent City. Major unincorporated communities include Smith River, Klamath, Hiouchi, Fort Dick, Gasquet, and Klamath Glen. The county Board of Supervisors administers ADU permitting in unincorporated territory under California Government Code Sec. 65852.2 and 65852.22 (state ADU preemption regime). The county is dominated by federal and state lands: Redwood National and State Parks (Jedediah Smith, Del Norte Coast, and Prairie Creek redwoods), Smith River National Recreation Area (Six Rivers National Forest), Pelican Bay State Prison (the state's first supermax facility, in Crescent City), and the Yurok Tribal Reservation along the Klamath River. The California Coastal Zone covers the entire western edge of the county.
Code citations:
- Del Norte County Code Title 21 - Zoning, ADU/JADU provisions
- Cal. Gov't Code Sec. 65852.2 (Accessory Dwelling Units)
- Cal. Gov't Code Sec. 65852.22 (Junior Accessory Dwelling Units)
- California Coastal Act (Pub. Resources Code Sec. 30000 et seq.)
- Del Norte County Local Coastal Program (LCP)
State-floor overlay: California state ADU preemption applies in full to unincorporated parcels. Coastal zone parcels also require Coastal Development Permits (CDPs) under the certified LCP, with Coastal Commission appeal jurisdiction on parcels in the coastal-appeal area. AB 1033 condo-conversion election status pending verification. AB 976 prohibits owner-occupancy mandates on detached ADUs. HCD oversight: ordinance amendments submitted within 60 days per Sec. 65852.2(h).
Adopting body: Del Norte County Board of Supervisors
County permitting (unincorporated parcels)
Del Norte County Community Development Department issues ADU permits for unincorporated parcels. Practical permitting frictions: California Coastal Zone covers the entire coastal strip (Smith River, Crescent City outskirts, Klamath); CDPs are required in addition to ADU permits for coastal-zone parcels and may be appealable to the California Coastal Commission. Tsunami inundation zone covers low-lying coastal parcels (the 2011 Tohoku tsunami caused major damage to Crescent City harbor). FEMA SFHA along the Smith and Klamath Rivers and coastal floodplain. CAL FIRE State Responsibility Area covers the inland forest lands; federal lands (Redwood NSP, Six Rivers NF) abut many parcels. Yurok Tribal jurisdiction along the lower Klamath. Septic/well infrastructure with limited public sewer outside Crescent City.
Process overview: Standard ministerial 60-day review per Sec. 65852.2(b) for compliant ADU applications outside the coastal zone. Coastal-zone parcels require concurrent Coastal Development Permit (CDP) issuance through the certified LCP; CDPs are discretionary and parcels in the appealable area carry Coastal Commission appeal rights, materially extending timelines. Tsunami-zone parcels require elevation/freeboard documentation. CAL FIRE clearance required on inland forest parcels.
Impact fees: SB 13 fee waivers apply to ADUs under 750 sqft. Coastal Development Permit fees are separate from ADU permit fees and stack on coastal-zone applications.
County assessor
The Del Norte County Assessor maintains parcel-level assessment records for the entire county including Crescent City. ADU additions are captured as improvements via shared permit data with the building department. Standard Prop 13 treatment applies. The assessor coordinates with the Yurok Tribe for parcels in or adjoining the Yurok Reservation along the lower Klamath where dual jurisdiction issues may arise.
Assessment policy: ADU improvement value is added on the next regular revaluation cycle following completion. Conversion ADUs (within existing structure) typically generate smaller incremental assessments than detached new construction. Tribal-trust land within the Yurok Reservation is exempt from county property assessment.
County overlays (6)
Del Norte County overlays of consequence: California Coastal Zone covering the entire coastal strip (Smith River north of Crescent City, Crescent City outskirts, Klamath); tsunami inundation zone along the entire coast (Crescent City was hardest-hit California city in the 1964 and 2011 tsunamis); FEMA SFHA along the Smith River, Klamath River, and coastal floodplain; CAL FIRE State Responsibility Area covering the inland forest belt; Redwood National and State Parks (federal-state co-managed) protecting old-growth coast redwood groves; Smith River National Recreation Area within Six Rivers National Forest; Yurok Tribal Reservation along the lower Klamath River; and Pelican Bay State Prison (a CDCR supermax facility) in Crescent City - prison parcels are state-owned and not subject to county zoning.
- California Coastal Zone - Del Norte Coastside
- Tsunami Inundation Zone - California Coast
- CAL FIRE State Responsibility Area / Very High FHSZ
- FEMA SFHA - Smith River / Klamath River / coastal floodplain
- Yurok Tribal Reservation - lower Klamath River
- Redwood National and State Parks adjacency / Six Rivers NF
California state — ADU law and programs
State ADU law
California has the most aggressive statewide ADU preemption regime in the US, built from ~15 bills passed 2019-2025 and enforced by the Department of Housing and Community Development (HCD). The 2026 HCD ADU Handbook addendum (in effect with the 2025 Title 24 code cycle) is the operative state-level reference. The regime does four things at once: (1) preempts local zoning that would ban or unreasonably restrict ADUs; (2) imposes by-right ministerial approval with short statutory deadlines; (3) caps fees and utility-connection charges; and (4) empowers HCD to void non-compliant local ordinances.
State HOA preemption
California has the strongest statewide HOA-preemption regime in the US for accessory dwelling units, built from two bills: AB 670 (2019) voided ADU-prohibiting covenants on single-family residential lots, and AB 3182 (2020) extended and codified the preemption into the Davis-Stirling Common Interest Development Act (Civil Code §§ 4740 / 4741). The combination prohibits common-interest communities from banning ADUs, restricting rentals below 25% of separate interests, or treating ADUs as separate HOA interests. Limits remain: HOAs retain authority over reasonable design standards and statutory height limits, and the 2026 Carlsbad case (CalMatters coverage) established that an HOA's documented design-standards regime can effectively delay or constrain ADU approval short of outright prohibition.
State financing programs
California's flagship state-level ADU financing program — the CalHFA ADU Grant Program — is paused and has not been refunded since the original $100 million allocation was fully deployed 2023-12-28. The program provided up to $40,000 per qualifying homeowner for pre-construction and non-recurring closing costs and financed approximately 2,500 ADUs in two rounds. As of 2026-04, no new funding round has been announced in the state budget. CalHFA continues to publish anti-scam warnings because bad actors actively solicit homeowners claiming access to grant funds that no longer exist. State-level financing activity has shifted to local pilot programs (San Francisco, San Jose, Los Angeles, San Diego) and private financing products (Fannie Mae ADU mortgage, HELOC, construction-to-permanent).
State housing programs
California's state-level ADU programs are concentrated at HCD (technical guidance, ordinance review, enforcement) and the paused CalHFA grant pipeline (covered under stateFinancing). The state does not operate a central pre-approved ADU plan library — instead, AB 1332 (2024) created a preemption framework for local pre-approved plans with a 30-day ministerial-approval deadline, and major cities (Los Angeles, San Diego, San Jose, Sacramento, Berkeley) have rolled out their own plan catalogs. The California YIMBY coalition and other housing-policy organizations play an influential role in bill drafting; they are not state agencies but effectively drive much of the ADU legislative agenda. The Title 24 code cycle (now 2025, in effect for 2026 permits) is the authoritative building-code baseline.
Federal (United States) — ADU-relevant rules and programs
Federal ADU law
The United States has no federal statute that directly regulates accessory dwelling unit entitlement or design. Land-use authority over ADUs resides with states and local governments under the traditional police power. Federal engagement is limited to financing (Fannie/Freddie/FHA/VA/USDA), flood insurance (FEMA/NFIP), and discretionary housing programs (HUD), which are recorded in sibling sections of this file.
Federal financing programs
Federal housing-finance agencies and GSEs set nationwide underwriting rules that govern whether an ADU can be financed, appraised, and counted toward mortgage qualifying income. The relevant actors are Fannie Mae, Freddie Mac, FHA (HUD), VA, and USDA Rural Development.
Federal tax credits
There is no ADU-specific federal tax credit. ADUs may incidentally qualify for existing federal energy-efficiency and clean-energy tax credits when the ADU construction includes qualifying measures.
Federal housing programs
HUD administers several discretionary programs that can fund ADU-related activity at the grantee's election, but none is an ADU-specific program.