Lassen County Zoning, Planning & Building Codes

Last reviewed: July 6, 2026

Overview

Lassen County regulates land use in the unincorporated areas through Title 18 of the Lassen County Code, which sets districts, use permissions, and development controls. By default, all unincorporated land is placed in the agricultural family of zones, with more specific districts applied as needed by ordinance amendments and consistent with the County General Plan . The code is organized by base zoning districts, combining/overlay districts, and countywide procedures such as design review, planned development permits, and use permits. Many chapters explicitly apply “in addition to” the code’s general and special provisions, and numerous districts defer to the county’s off-street parking standards in Chapter 18.104 .

Core rule of thumb: the unincorporated area is classified A‑1 until rezoned; zoning is a tool to implement the General Plan, and amendments are made by ordinance of the Board of Supervisors (§ 18.06.020) .

How Lassen County’s code is organized

• Title 18 begins with the “Effect and Purpose” and district-designation framework. § 18.06.010–.030 explains application to unincorporated areas and links rezoning to an amendment procedure; § 18.08.010–.020 lists all base and combining districts .
• Base districts (for example, A‑1, A‑2, A‑3, R‑1, R‑2, R‑3, C‑G, M‑1, M‑L, B‑P, P‑C) each contain intent, allowed uses, and development standards; many chapters state that they are “subject to the general provisions” and “special provisions” of Title 18.102–18.108 (see § 18.22.020, § 18.33.020) .
• Countywide procedures include:
  • Design review: Chapter 18.118 authorizes design review and identifies the Architectural Review Committee (ARC) and review timelines (§ 18.118.010, § 18.118.040) .
  • Planned development permits (P.D.): Chapter 18.116 sets purpose, application contents, completeness review within 30 days, public hearing noticing, and findings (§ 18.116.010, § 18.116.030–.050, § 18.116.070–.080) .
  • Certificates of conditional use: Chapter 18.114 provides appeals and revocation mechanics (§ 18.114.050–.060) .
  • Development agreements: Chapter 18.117 provides application/eligibility and fee authority (§ 18.117.030–.050) .
• Airport-related review and overlays: the P‑S‑A district requires referral to the Airport Land Use Commission with stated timeframes (§ 18.97.040) and airport approach rules are codified in separate airport chapters (e.g., §§ 18.132.130–.160) .

Zoning district families

Lassen County’s zoning map uses these base families and combining districts (selected highlights).

• Agricultural and resource districts (samples):

  • A‑1 (General Agricultural): Countywide default district; A‑1’s applicability and use structure are stated at § 18.16.010–.050 .
  • A‑2 (Agricultural‑Residential): Typical standards include 35 ft height, 35% site coverage, and 20 ft front yard, with 10% of lot width (max 15 ft) side yards and 20 ft rear yards (§ 18.18.050) .
  • A‑3 (Agricultural): Emphasizes larger holdings with a minimum parcel size of 75 acres and base setbacks of 20 ft front, 10 ft side, 20 ft rear (§ 18.20.050) .
  • E‑A (Exclusive Agricultural): Applies general agricultural protections and is subject to general/special provisions (§§ 18.66.010–.020) .
  • Timber/forest/open space designations like T‑P‑Z, A‑F, O‑S, U‑C, U‑C‑2 are listed at § 18.08.010; O‑S includes special area controls (§ 18.64.050) .

• Residential districts:

  • R‑1 (Single‑Family): Key standards—height 25 ft (up to 35 ft with design review), 35% lot coverage, 20 ft front yard, side yard 10% of lot width (max 15 ft, can be reduced to 5 ft with design review), and 20 ft rear yard (§ 18.22.050) .
  • R‑2 (Limited Multiple‑Family): Similar core standards; 35% coverage, 20 ft front, side yard 10% of lot width (max 15 ft, may reduce to 5 ft with design review), 20 ft rear (§ 18.24.050) .

• Commercial and mixed-use:

  • C‑G (General Commercial): Special provisions require paved off‑street parking and landscaping, including one tree per eight spaces (§ 18.32.060) .
  • C‑R (Commercial‑Residential): Integrates commercial and residential uses subject to general and special provisions (§§ 18.33.010–.020) .
  • H district: Allows hospitality‑oriented uses like motels/RV parks and sets 35 ft height and a 30 ft front yard from any dwelling/hotel/motel (§ 18.92.050) .
  • Y‑C Airport Commercial: Sets 20 ft minimum front yard and 35 ft height, requires paving and design review and defers to Chapter 18.104 for parking (§ 18.76.050–.060) .

• Industrial:

  • M‑L (Limited Industrial): Typical parcel standards—minimum lot 6,000 sf; front yard 20 ft (and 50 ft from roadway centerline); side yard 15 ft (or 10% of lot width, 25 ft when adjacent to residential); rear yard 10 ft; maximum height 45 ft; paved parking at “2 spaces per 3 employees,” and design review required (§§ 18.40.050–.060) .
  • M‑1 (Light Industrial): States intent and applicability, with uses and standards administered alongside general/special provisions (§§ 18.42.010–.030) .

• Planned/mixed formats:

  • B‑P (Business Park): Mix of light industrial/office/lab uses, subject to general/special provisions (§§ 18.39.010–.030) .
  • P‑C (Planned Community): Requires a use‑permit‑backed plan package; ties height to underlying use types (e.g., 35 ft for R‑1/R‑2 uses, 45 ft for R‑3/C‑1 uses); includes its own parking ratios (§§ 18.50.030–.080) .

• Combining/overlay districts:

  • D (Design Combining): Triggers design review per § 18.86.030, with design intent in § 18.86.010 .
  • F (Floodplain): Adds flood-hazard controls in addition to companion zoning (§ 18.88.020) .
  • NH (Natural Habitat): Establishes average building‑site area and density management; references area‑plan‑specific wildlife measures and shows an example in the Richmond/Gold Run area (§ 18.94.020–.030) .
  • G (Geothermal): Requires specific findings and sets minimum parcel size and setback linkage (§§ 18.90.070–.080) .
  • Airport influence and approaches: P‑S‑A referral timelines (§ 18.97.040) and separate airport‑approach chapters with permitting/variance mechanisms (§§ 18.132.130–.160) .

Citywide development standards

Most districts carry their own numerical standards; several also defer to countywide development standards and Chapter 18.104 for parking and site design. Representative baselines:

• Residential anchors

  • R‑1: 25 ft height (up to 35 ft with design review), 35% coverage, 20 ft front; side yard 10% of lot width (max 15 ft, may reduce to 5 ft with design review), 20 ft rear (§ 18.22.050) .
  • R‑2: 35% coverage, 20 ft front; side yard 10% of lot width (max 15 ft, may reduce to 5 ft with design review), 20 ft rear (§ 18.24.050) .

• Agricultural/residential transitions

  • A‑2: 35 ft height, 35% coverage; 20 ft front; side yard 10% of lot width (max 15 ft, min 5 ft); 20 ft rear; special distances for accessory buildings (§ 18.18.050) .

• Commercial/industrial siting and landscape

  • C‑G and M‑L require paved off‑street parking, with tree‑per‑eight‑spaces landscaping and minimum space dimensions noted; M‑L adds a “2 spaces per 3 employees” rule and design review (§§ 18.32.060; 18.40.050–.060) .
  • Y‑C and other airport‑adjacent districts likewise defer to Chapter 18.104 for parking and require design review (§ 18.76.060) .

Note: FAR standards are not identified in the retrieved sections; verify with the County if an FAR applies in your district (Not found in retrieved materials).

Specific plans & overlays

• Planned Unit Development and Planned Development: Complex or innovative projects proceed via a Planned Development (P.D.) permit; in P.U.D. districts, a P.D. permit is required, and even outside P.U.D. zones the County may accept P.D. applications if consistent with the General Plan or an area plan (§ 18.116.010). A P.D. application has detailed mapping and design contents and can incorporate specific plans by reference (§ 18.116.030–.040) .
• Area plans and resource overlays: The NH overlay references area‑plan‑specific wildlife protections (e.g., Richmond/Gold Run) and imposes average building‑site area as a density tool (§ 18.94.030) .
• Combining districts add standards on top of base zoning: e.g., D requires design review (§ 18.86.030), F adds flood‑hazard criteria (§ 18.88.020), and G (Geothermal) imposes findings and minimum parcel size (§§ 18.90.070–.080) .

Building permits & review

• Step 1: Confirm the base zoning and any combining/overlay district on your parcel in the unincorporated areas via Lassen County Land Use and code districts listed in § 18.08.010–.020 .
• Step 2: Determine if design review is required by your district (e.g., D combining districts or where chapters say “all development shall be subject to design review”). The ARC composition and a 14‑day review window are in § 18.118.040(a), and triggers are in § 18.118.010 .
• Step 3: If your use requires a certificate of conditional use, follow Chapter 18.114’s procedures; decisions can be appealed to the Board within 10 days (§ 18.114.050), and certificates may be revoked if conditions are not met (§ 18.114.060) .
• Step 4: For multi‑phase or master‑planned projects, use the P.D. permit path; the County screens application completeness within 30 days, then holds public hearings with mailed and published notice before action (§§ 18.116.050, 18.116.070–.080) .
• Step 5: Building permits are reviewed for conformance with the California Building Standards Code after land‑use entitlements are in place; project‑type chapters often embed site/landscape/parking conditions your building plans must satisfy (e.g., § 18.32.060; § 18.40.060) .

State housing law in Lassen County

• California ADU law preempts local prohibitions and requires ministerial approval of at least one ADU per lot meeting state‑mandated development envelopes (e.g., the state requires allowance of an ADU of at least 800 sf with 4‑ft side/rear setbacks under Government Code § 66321(b)(3) and sets height allowances; see the 2025 ADU Handbook excerpts) . While local special‑use text in Title 18 addresses “second dwelling units,” state requirements control where conflicts exist (see Gov. Code §§ 66321–66323 summarized in the same handbook) .
• Other California housing laws such as SB 9 and density bonus may constrain local discretion in qualifying locations; a local implementation chapter was not found in the retrieved Title 18 materials (Not found in retrieved materials—verify applicability with the County).

Information Gaps

• Use Permits and Variances: The general “Use Permit” chapter (18.112) and any general variance chapter were referenced but not retrieved in detail here (Not found in retrieved materials).
• Parking Chapter 18.104: Repeatedly cross‑referenced, but specific §‑level standards were not retrieved (use the cross‑references in § 18.32.060; § 18.40.060; § 18.76.060 to orient) .
• P.U.D. Chapter 18.48: Referenced by the P.D. permit chapter but not retrieved (Not found in retrieved materials).

Source References

• Title 18 organization and effect/purpose: § 18.06.010–.030; § 18.08.010–.020
• Default agricultural classification and A‑1 applicability: § 18.16.010–.050
• Residential standards: R‑1 § 18.22.050; R‑2 § 18.24.050
• Agricultural standards: A‑2 § 18.18.050; A‑3 § 18.20.050; E‑A §§ 18.66.010–.020
• Commercial/Industrial examples: C‑G § 18.32.060; M‑L §§ 18.40.050–.060; M‑1 §§ 18.42.010–.030; H § 18.92.050; Y‑C § 18.76.050–.060
• Planned procedures: P.D. permits §§ 18.116.010, 18.116.030–.050, 18.116.070–.080; P‑C §§ 18.50.030–.080; B‑P §§ 18.39.010–.030; Development agreements §§ 18.117.030–.050
• Design review triggers and process: D §§ 18.86.010, 18.86.030; Design Review §§ 18.118.010, 18.118.040
• Airport & ALUC review: P‑S‑A § 18.97.040; airport approaches §§ 18.132.130–.160
• State ADU requirements (overview): 2025 California ADU Handbook (Gov. Code §§ 66321–66323)