Modoc County — Design Review

Last reviewed: July 6, 2026

Overview

In unincorporated Modoc County, “design review” is carried out through the county’s ministerial site plan review process under Title 18 Zoning. Every application tied to constructing, enlarging, relocating, or altering a building typically undergoes site plan review to verify consistency with zoning, the general plan, and any specific plan, with decisions issued administratively by the Planning Director.

The single most important rule: in unincorporated areas, every building-permit application requires site plan review, decided administratively and without a public hearing.

Design review also plugs into objective, zone- or use-specific standards (for example, multi-family housing design), overlay constraints (like flood or airport hazard), and special facility design criteria (e.g., communications towers).

How Modoc’s “Design Review” Works (Site Plan Review)

• Trigger and scope. Site plan review is required for “all land use entitlements requiring site plan review” and for every building-permit application to construct, reconstruct, relocate, place, enlarge, extend, or alter a building for a new or changed use. It is an administrative action—no public notice or hearing.
• Submittals and timing. A complete plan set must show existing/proposed uses, improvements, parking, setbacks, heights, yards, easements, and roads; completeness is checked within 30 days. The Planning Director then approves, conditionally approves, or denies the application within 20 days of deeming it complete. Conditions are limited to conforming the project to Title 18, the general plan, and any specific plan, plus recordation of notice terms.
• Appeals. Any interested person may appeal the Director’s decision to the Planning Commission.
• Effect and expiration. No building or mobilehome permit may issue until a site plan is approved; approvals expire in one year unless substantial commencement occurs or the applicant proves delays beyond their control.

What Is Evaluated

• Consistency with Title 18 development standards (yards, coverage, height, access, signage) and any applicable specific plan.
• Consistency with objective, use-specific standards—most notably for multi-family housing projects, which must meet objective design criteria (e.g., max 70% coverage; locate parking behind/screened; minimum 10% improved landscaping; façade articulation and roof forms).
• Any applicable overlay constraints (e.g., Overlay Districts like Flood Hazard or Airport Hazard) that influence site layout, height, and materials.
• Where a Use Permit is required (separate from site plan review), the Planning Commission may impose conditions and findings through a noticed public hearing.

Special Design-Heavy Processes and Topics

• Planned Development (PD) permits. PD submittals must include general elevations/representative architectural drawings; approvals can specify required architectural design plans/features and landscaping.
• Communications facilities/towers. Explicit design standards require blending with surroundings (e.g., colors, stealth structures), fencing/screening, vegetation protection, and shielded lighting—applied countywide in unincorporated areas.
• Housing objective standards. For multi-family and streamlined housing, design standards must remain objective and are limited by state law; Modoc’s standards codify those objective criteria. See also California housing laws.

District-by-District: What Design Review Looks For

The following zones are established in unincorporated Modoc County’s Title 18; site plan review ensures projects in each district meet applicable dimensional and design standards.

RH — Residential High Density

• Purpose/where used: Provides space for higher-density residential consistent with the general plan.
• Typical permitted uses: Single-family; two-family (when standards met); multi-family up to 13 du/acre with public water/sewer and subject to objective design standards.
• Key standards: Minimum lot size/width vary by utilities; front/side street yards 20 ft; rear/side 5 ft; max building height two stories not over 50 ft; max lot coverage 60%.
• Design review focus: Compliance with § 18.110.080 objective multi-family design (coverage, parking location, landscaping, articulation).

RL — Residential Low Density

• Purpose/where used: Lower-density residential in urban/residential/rural residential designations.
• Typical uses: Single-family; with a Use Permit, two-family and multi-family; hospitality (RVP/motel/hotel) in limited cases.
• Key standards: Lot size/width tied to utilities; front/side street 20 ft; rear/side 5 ft; max height 50 ft; max coverage 60%.
• Design review focus: Yards and transitions to nearby RH/RR; on-site parking layout.

RR — Rural Residential

• Purpose/where used: Rural living with larger lots (1–15 acres), maintaining rural character.
• Typical uses: Single-family and accessory uses; low-intensity recreation; limited agriculture; some public/quasi-public uses.
• Key standards: Minimum lot size/width per RR suffix (e.g., RR‑5); yards 20 ft front/side street and 30 ft rear/side.
• Design review focus: Rural siting, screening, and compatibility with larger setbacks and landscape character.

AG — Agricultural General

• Purpose/where used: General agriculture areas; broad agricultural support and rural services.
• Typical uses (by permit): From agricultural support to resource-based industries; some commercial and lodging uses by Use Permit.
• Key standards: Minimum lot size generally 3 acres (higher when adjacent to AE); yards 20 ft front/side street and 5 ft rear/side (with buffers near RH/RL/RR and AE); coverage 10% (excludes lots <5 acres).
• Design review focus: Buffers to residential zones, access for large vehicles, and on-site signage compliance.

AE — Agricultural Exclusive

• Purpose/where used: Exclusive agricultural production lands.
• Typical uses: Agriculture and associated uses; selected accessory dwellings/admin permit uses with siting limits; broader uses by Use Permit.
• Key standards: Yards 20 ft front/side street and 50 ft rear/side for dwellings; coverage 10% (not applied to parcels ≤5 acres).
• Design review focus: Siting to minimize land use conflicts; adherence to yard buffers from nearby residential zones.

C — Commercial

• Purpose/where used: Commercial services in community centers and corridors.
• Typical uses: Commercial and compatible mixed-use; residential uses trigger residential standards where applicable.
• Key standards: Yards 10 ft front/side street, 5 ft rear/side; when abutting RH/RL/RR/RT, increased yards and height transition; coverage up to 60% when dwellings on lot.
• Design review focus: Street-oriented site design; screened parking; transitions to nearby residential.

IL — Industrial Light

• Purpose/where used: Light industrial uses with performance standards.
• Typical uses: Fabrication, warehousing, service industrial.
• Key standards: Min lot 6,000 sf; yards 10 ft front/side street and 5 ft rear/side (greater buffers/height limits adjacent to RH/RL/RR/RT); on-site performance standards (odor, glare, etc.).
• Design review focus: Site plan review is mandatory for any building permit or change/extension of use; agency consultation may impose more restrictive design, storage, and fire protection measures to meet zone purposes.

I — Industrial

• Purpose/where used: Accommodates a wider range of industrial and heavy commercial activities; reserves industrial lands.
• Typical uses: Manufacturing, assembly, research, wholesale, storage (with noted exclusions).
• Key standards: Governed by Chapter 18.54 with cross-reference to general development standards in Chapter 18.110.
• Design review focus: Access and circulation for heavy vehicles, parking and screening per general standards.

Overlays That Influence Design Review

• Flood Hazard (FH). Construction standards mandate anchoring, flood-resistant materials, elevation or floodproofing, and drainage paths in special flood hazard areas; these requirements directly shape building siting and detailing.
• Airport Hazard (AH). Height and use restrictions near airports (e.g., Tulelake) limit glare, lighting, and obstructions; verify heights within approach, horizontal, conical, and transition zones.
• Environmental Protection (EP). May require modified densities/lot sizes and recordation of notice for protected or hazardous areas—affecting layout and feasible building envelopes.

Key Objective Design Standards (selected)

Use these frequently during site plan review alongside base zone standards and land use permissions.

Also remember general yards, access and Parking standards (e.g., minimum stall sizes, approach widths) in Chapter 18.110, which are common conditioning points in site plan approvals.

Checklist

• Confirm the parcel’s base zone and any overlay district on the county zoning map, and that the site is in unincorporated Modoc County.
• Prepare a complete site plan (all proposed improvements, setbacks, heights, yards, easements, circulation, parking).
• Match base zone dimensional standards (yards/height/coverage) and any objective design criteria applicable to your use (e.g., § 18.110.080 for multi-family).
• Check overlays (FH/AH/EP) and incorporate required siting/elevation/height limits and notices.
• If in IL, include materials list and be ready for interagency review for added safety/design conditions.
• If proposing a PD, include elevations/representative architectural drawings.
• Provide signage details meeting clearance/maintenance rules if signs are included.
• Consider nonconforming limits if altering an existing nonconforming structure.

Risks & Ambiguities

Plain-English Summary

In unincorporated Modoc County, design review happens as a quick, administrative “site plan review.” You submit a complete site plan; the Planning Director checks it for zoning, development standards, parking, objective design rules, and any overlays. There’s no public hearing for site plans, decisions come fast, and your approval expires if you don’t start work within a year.

Source References

• Title 18 Zoning: applicability to unincorporated areas; zones list; general yard/height provisions. § 18.02.060; § 18.02.030; § 18.02.050
• Site Plan Review: purpose, applicability, submittals, action, appeals, effect/expiration. §§ 18.120.010–18.120.060
• Multi-family objective design standards. § 18.110.080
• General development standards (yards, parking). § 18.110.050 and related parking provisions
• Planned Development (PD) design submittals/conditions. §§ 18.126.040(B)(7), 18.126.050(D)(4)
• Communications facilities design standards. § 18.166.050(C)
• Flood Hazard standards influencing design. § 18.71.170
• Airport Hazard overlay. §§ 18.90.120–18.90.140
• Zone-specific examples cited: RH (§§ 18.36.010–.030, .060), RL (§§ 18.32.010, .050–.060), RR (§ 18.30.060), AG (§§ 18.24.050–.060), AE (§§ 18.18.040–.060), C (18.40.060), IL (§§ 18.50.050–.070), I (§§ 18.54.010–.030)

Retrieved passages

• Modoc County Zoning Code (Chapter 18.144.) High relevance show source text
• Modoc County Zoning Code (Chapter 18.140) High relevance show source text
• Modoc County Zoning Code (§ 65940) Medium relevance show source text
• Modoc County Zoning Code (Chapter 18.128) Medium relevance show source text
• Modoc County Zoning Code (title for) Medium relevance show source text
• Modoc County Zoning Code (Chapter 18.126) Medium relevance show source text
• Modoc County Zoning Code (Chapter 18.144.) Medium relevance show source text
• Modoc County Zoning Code (chapter are) Medium relevance show source text
• Modoc County Zoning Code (Chapter 18.144.) Medium relevance show source text
• Modoc County Zoning Code (Title 18) Medium relevance show source text
• Modoc County Zoning Code (Section 65664) Medium relevance show source text
• Modoc County Zoning Code (Chapter 18.74) Medium relevance show source text
• Modoc County Zoning Code (§ 65595) Medium relevance show source text
• Modoc County Zoning Code (section 18.71.180.) Medium relevance show source text
• Modoc County Zoning Code (Chapter 18.36) Medium relevance show source text
• Modoc County Zoning Code (Chapter 12.04) Medium relevance show source text
• Modoc County Zoning Code (ARTICLE IV.) Medium relevance show source text
• Modoc County Zoning Code (title within) Medium relevance show source text
• Modoc County Zoning Code (Chapter 18.170) Medium relevance show source text
• Modoc County Zoning Code (chapter is) Medium relevance show source text
• Modoc County Zoning Code (chapter are) Medium relevance show source text
• Modoc County Zoning Code (section 18.71.150) Medium relevance show source text
• Modoc County Zoning Code (Chapter 18.20) Medium relevance show source text
• Modoc County Zoning Code (chapter shall) Medium relevance show source text
• Modoc County Zoning Code (Section 18.74.040.) Medium relevance show source text
• Modoc County Zoning Code (Chapter 18.110.) Medium relevance show source text
• Modoc County Zoning Code (Chapter 18.110.) Medium relevance show source text

Cited sections

• Title 18 Zoning: applicability to unincorporated areas; zones list; general yard/height provisions. § 18.02.060; § 18.02.030; § 18.02.050 (Title 18)
• Site Plan Review: purpose, applicability, submittals, action, appeals, effect/expiration. §§ 18.120.010–18.120.060 (§ 18.120.010)
• Multi-family objective design standards. § 18.110.080 (§ 18.110.080)
• General development standards (yards, parking). § 18.110.050 and related parking provisions (§ 18.110.050)
• Planned Development (PD) design submittals/conditions. §§ 18.126.040(B)(7), 18.126.050(D)(4) (§ 18.126.040)
• Communications facilities design standards. § 18.166.050(C) (§ 18.166.050)
• Flood Hazard standards influencing design. § 18.71.170 (§ 18.71.170)
• Airport Hazard overlay. §§ 18.90.120–18.90.140 (§ 18.90.120)
• Zone-specific examples cited: RH (§§ 18.36.010–.030, .060), RL (§§ 18.32.010, .050–.060), RR (§ 18.30.060), AG (§§ 18.24.050–.060), AE (§§ 18.18.040–.060), C (18.40.060), IL (§§ 18.50.050–.070), I (§§ 18.54.010–.030) (§ 18.36.010)
• ModocCounty_ZoningCode.md

• Official Modoc County code library