Humboldt County Zoning, Planning & Building Codes

Last reviewed: July 3, 2026

Overview

This page orients you to land use regulation in the unincorporated areas of Humboldt County: where to find the zoning code, how the code is organized, the main district families, the typical development standards you’ll run into (setbacks, height, parking), key overlay and specific-plan rules, and how building permits, design review, and state housing laws interact with county rules. The County’s zoning regulations are codified within the Humboldt County Code (Title III land‑use divisions and the zoning chapters listed below) and are administered by the County Planning Division for unincorporated areas (§16.3.2) .

How Humboldt County's code is organized

• The zoning and combining‑zone rules are set out as numbered sections in the Humboldt County Code (the zoning text appears in parts with section numbers like § 313‑7.1, § 314‑6.1, etc.); individual zone rules and combining/overlay designations are grouped into chapter-like sections for practical lookup .
• Combining and overlay zone designators and their code cross‑references (for example AP for Airport Safety Review, D for Design Review, STMP for the Samoa Town Master Plan overlay) are collected in the Special Area/Combining Zones table (see table at § 15.3 and cross‑references such as § 313‑16.3) .
• Use tables and the per‑zone development standards (minimum lot, setbacks, height, permitted uses) live with each zone’s section (for example § 313‑7.1 for the AE Agriculture Exclusive standards and § 314‑6.1 for the RS Residential Suburban standards) .
• County practice requires Planning Division approvals (plot/site plan and zoning clearances) before the Building Division issues building permits; plot‑plan rules are codified at § 110.2 and cross‑referenced to the zoning clearance procedures in Chapter 2 (§ 312‑2) .

Note: for quick navigation on GoCodebook we link the County topics in this page: the word “zoning” below links to the County zoning menu for Humboldt County. The first time this page refers to specific procedural topics we link to the matching GoCodebook topic for convenience: see the inline links for zoning, development standards, parking, design review, overlay districts, ADUs, and the California Building Standards Code.

Zoning district families (how the County groups districts)

Humboldt’s zoning separates principal zone families and then applies combining/overlay zones where needed. Typical families and representative local code sections:

• Agriculture — e.g., AE: Agriculture Exclusive. The AE zone lists permitted uses, minimum lot sizes (AE‑20, AE‑40, AE‑60, etc.), and setbacks such as a 20 ft front setback and 30 ft rear/setback standards for many AE subzones (§ 313‑7.1) .
• Residential — e.g., RS: Residential Suburban (large‑lot suburban rules). RS lists principal permitted uses (including Accessory dwelling unit) and minimum lot area 1 acre, minimum lot width 125 ft (§ 314‑6.1) .
• Public / Facilities — e.g., PF1: Public Facility (Urban) lists civic uses, minimum lot sizes and lot width standards and specific permitted/conditional uses (§ 314‑4.2) .
• Airport / Safety — AV: Airport and the separate AP Airport Safety Review combining zone regulate uses and heights near airports; the County imposes special density and height limits in approach/clear zones (see § 314‑4.1 and § 16.3 for AP combining‑zone rules) .
• Flood / Resource / Open Space — e.g., DF: Design Floodway and other resource zones set very restrictive use lists and lot/structure rules to protect floodways and habitats (see § 5.1 for DF and related resource protections) .
• Commercial / Industrial — Multiple CG/CS (commercial) and ML/MG/MC (industrial) designations appear across the code and are invoked directly and in specialized chapters (for example industrial use performance standards referenced by the industrial zone tables) .
• Combining / Overlay zones — The County uses combining designators (e.g., D for design review, AP airport safety, STMP Samoa Town Master Plan, flood, Alquist‑Priolo fault hazard, streams/riparian protection). The full combining list and code cross‑references sit in the Special Area table and individual combining‑zone sections (see § 15.3 and the cross‑referenced sections such as § 313‑16.3, § 19.1, § 34.5.4) .

Citywide development standards (what you’ll typically see)

• Where to read them: each zoning district page includes its own minimum lot, setbacks, max coverage and height standards (examples: § 313‑7.1 for AE; § 314‑6.1 for RS) . The County also notes that setbacks may be modified by other code provisions such as the Alquist‑Priolo fault hazard rule or Fire Safe Regulations (see notes appended to zone tables in § 313‑7.1 and elsewhere) .
• Typical numeric examples (representative, check the zone section that applies to your parcel): the AE zone shows a 20 ft front yard, 30 ft rear yard, and 30 ft interior side yard in many AE subzones (§ 313‑7.1) . The RS zone lists a 1‑acre minimum lot area and 125 ft minimum lot width (§ 314‑6.1) . Many other districts list their own front/side/rear setbacks in the same manner.
• Parking: off‑street parking requirements and definitions are handled in the County’s parking rules; see the County’s off‑street parking standards (referenced in the code as § 313‑109.1) and the County practice that parking requirements apply per use unless modified under incentives or state law exceptions . (See the GoCodebook link to Humboldt County parking.)
• Design, landscaping and signage: design triggers and procedures are handled through combining zones (e.g., D: Design Review at § 19.1), and separate chapters cover signage, landscaping and screening, and historic preservation processes where applicable . (See the GoCodebook design review and landscaping and screening topics.)

Specific plans & overlays that matter in Humboldt County

• Samoa Town Master Plan (STMP): the STMP overlay (designator STMP) imposes its own land‑use map, development conditions and coastal‑permit findings; new development within the STMP requires the STMP‑specific findings and submittal requirements in § 34.5.4 and associated STMP text (coastal development permit and parcel‑map recordation are explicit preconditions to certain rezoning changes) .
• Airport Safety Review: the AP combining zone imposes height, density and permit limits in approach and clear zones; see § 16.3 and the Airport Safety Review matrix for how AP modifies principal zone rules (§ 16.3.2–16.3.4) .
• Coastal & resource overlays: the county’s coastal and resource combining zones (streams/riparian, coastal wetlands, flood hazards, Alquist‑Priolo, etc.) appear as combining designators and have dedicated sections that add siting, buffer and permitting requirements (see combining list § 15.3 and associated implementing sections such as § 61.1 for streamside/wetland protection) . (See the GoCodebook overlay districts.)

Building permits & review — the typical path (practical orientation)

• Pre‑permit planning review: before the Building Division issues a building permit, the Planning Division must approve a plot plan/site plan showing how the work relates to uses and property lines (§ 110.2) .
• Zoning clearance and ministerial approvals: many routine uses receive a zoning clearance certificate; zoning clearance revocation and appeal rules are in the zoning clearance procedures (§ 61.05.7) .
• Discretionary review: projects subject to combining‑zone special permits, design review (§ 19.1), coastal development permits (where applicable), or conditional use permits follow the Planning Commission or Board hearing pathways listed in the applicable sections (e.g., § 19.1 for design review procedures) . (See the GoCodebook design review and variances and exceptions topics.)
• Building code compliance: all construction must comply with the California Building Standards Code (Title 24) and local plot‑plan/building‑permit coordination (see the County plot‑plan rule § 110.2 and the state building code). See GoCodebook’s link to the California Building Standards Code.

State housing law in Humboldt County

• Accessory Dwelling Units (ADUs): the County’s zoning lists Accessory dwelling unit as an allowed use in some residential zones (for example RS includes ADUs as a principal permitted use in § 314‑6.1) . State ADU law imposes limits and timelines that constrain local regulation (for example, state ADU provisions prohibit local limits that prevent at least an 800 sf ADU with 4‑ft side/rear setbacks and require ministerial processing timelines); see the 2025 ADU summary for those state constraints (referenced in the County’s practice) . (See GoCodebook’s California ADU law and California housing laws.)
• Density bonus and incentives: Humboldt County has a local Density Bonus chapter that implements state density bonus law and ties to California Government Code § 65915; the County’s Density Bonus chapter is codified at § 112.1 and explicitly folds in state law where there’s conflict (§ 112.1.1) .
• SB9 / lot‑splitting / ministerial “by‑right” rules: the uploaded local code materials reviewed here document the County’s zoning framework and state‑law‑linked density bonus rules, but explicit local implementing language for SB9 (ministerial urban lot splits / duplex allowances) was not found in the retrieved materials. Verify with the County Planning Division for the current local SB9 implementation or any discretionary objective standards that the County applies (Not found in retrieved materials).

Practical notes & red flags

• Always check the specific zoning section that covers your parcel: the per‑zone tables contain the controlling minimum lot sizes, setbacks, and whether a use is principal or requires a special permit (examples: § 313‑7.1 for AE, § 314‑6.1 for RS) .
• Combining zones commonly change numeric standards (e.g., airport approach density or floodway prohibitions); consult the combining section (table § 15.3 and the combining section itself such as § 16.3) for those modified standards .
• Cannabis and specialized land‑use chapters: the County has detailed local cannabis land‑use rules (siting, buffers, and coastal caps by local coastal area plan at § 313‑55.4 et seq.) that add special setbacks, buffer distances, and permit caps — these are examples of subject‑specific local rules that can supersede simple zone permissions for particular uses (§ 313‑55.4.6.4.4 and § 313‑55.4.6.8) .

Information Gaps

• A few topic‑specific local sections were not returned in the uploaded materials (for example a clearly tagged “Nonconforming Uses” chapter or the County’s present SB9‑specific implementing text). If you need detailed step‑by‑step procedures for appeals, variances, or nonconforming use amortization, request those specific code sections or consult Planning staff for the most recent ordinance updates (some of these topics are referenced but the full text was not found in the retrieved excerpts) .

Source References

• Humboldt County zoning code excerpts and zone tables (examples cited above, see zone text such as § 313‑7.1 (AE), § 314‑6.1 (RS)) .
• Combining/Overlay zones table and combining cross‑references (Special Area Combining Zones, § 15.3) .
• Airport Safety Review combining zone (§ 16.3 and AP matrix) .
• Design Review rules (§ 19.1) .
• Plot plan/Building permit coordination (§ 110.2) and Density Bonus chapter (§ 112.1) .
• Zoning clearance certificate and related procedures (zoning clearance revocation, § 61.05.7) .
• Cannabis land‑use rules and buffers (§ 313‑55.4 et seq.; setbacks and caps) .
• State ADU summary that explains ministerial ADU constraints on local rules (2025 ADU summary) .