Glenn County — Signage

Last reviewed: July 3, 2026

Overview

This page summarizes what the Glenn County Unified Development Code requires for signs in the unincorporated areas of Glenn County. The rules are concentrated in Chapter 15.62 — Sign Standards and applied across zoning districts; specific allowances and exceptions appear elsewhere (for example home occupations, planned developments, and encroachment rules). Read this as county-level rules that control signs on unincorporated parcels only; incorporated cities inside Glenn County have their own codes. See the county's Development Standards for related dimensional rules and check California Building Standards Code for the state construction standards that may affect illuminated or structural sign work.

Key takeaways (short)

• Countywide sign chapter: § 15.62.010–080 sets purpose, general provisions, exemptions, prohibitions, directional sign specs, allowed sign area by use type, off‑premises rules, and maintenance; the chapter applies to all unincorporated zones unless a different district rule is explicit (§ 15.62.010–080 ).
• Commercial vs industrial sign area: commercial = 1 sf per linear foot of building frontage (max 250 sf); industrial = 2 sf per linear foot (max 500 sf) (§ 15.62.060 ).
• Directional signs, many temporary/exempt signs, and prohibited sign types are spelled out; off‑premises advertising structures require a conditional use permit and are allowed only in certain zones (§ 15.62.030–070 ).

How the rules work, district by district

Below each district I summarize the district purpose and the sign-specific implications the code contains for that district (what the code directly says; where the code is silent I flag it).

Note: the sign chapter itself applies countywide; where the district chapters add or limit signage, those are shown.

All zones (general / countywide)

• Purpose and baseline rules for signs: § 15.62.010 (purpose) and § 15.62.020 (general provisions) apply in the unincorporated areas. County requires property‑owner consent for a sign, forbids signs in county streets/rights‑of‑way without a variance (or encroachment permit), and requires compliance with state electrical/clearance laws (§ 15.62.010–020 ). See Glenn County Variances and Exceptions for procedures if you need relief.
• Exemptions (do not count toward permitted area): agricultural signs, construction signs, directory signs, hazard signs, internal signs, limited informational signs, official signs, political signs (with size/time limits), real estate signs, and window signs are listed in § 15.62.030 .
• Prohibited signs: anything that imitates traffic control, obscene signs, moving/flashing/rotating signs (with limited exceptions), sound‑emitting signs, and signs identifying uses that have not occupied the site for > six months are prohibited (§ 15.62.040 ).
• Directional signs: allowed in all zones but strictly dimensioned and limited in number (§ 15.62.050 ).
• Maintenance: signs must be kept safe and legible; signs for discontinued uses must be removed within six months (§ 15.62.080 ).

AE — Exclusive Agricultural Zone (and AP / AT / FA agricultural districts)

• Purpose: protect agricultural production (see district headers such as 15.33 AE, 15.46 AP, 15.32 FA) and apply agricultural site standards (front setbacks, heights) (§ 15.33, § 15.46, § 15.32 ).
• Sign specifics:
  • Agricultural signs: two signs with a total aggregate area not exceeding 32 sq ft per lot are explicitly exempt (do not count against standard limit) (§ 15.62.030.1 ).
  • Off‑premises advertising structures: the sign chapter states such structures may be permitted only in RZ, AE, AP C, and M zones with a conditional use permit — so AE is listed as an allowable zone for off‑premises advertising only by CUP (§ 15.62.070 ). (See Risks & Ambiguities about the literal phrasing "AP C".)
• If you develop a farm business with customer access, remember site plan review standards tie into parking and setbacks — consult the county Parking and Development Standards pages.

RZ — Recreation / Resource Zones

• Purpose and typical uses: recreation, low‑density dwellings, light agriculture — see § 15.31 RZ for full scope and restrictions (§ 15.31.010–080 ).
• Sign specifics:
  • The sign chapter applies; off‑premises advertising is listed as potentially allowed in RZ via CUP (§ 15.62.070 ).
  • Directional and temporary signs follow the countywide rules (directional signs permitted in all zones — § 15.62.050 ).

R-1 — Single‑Family Residential Zone

• Purpose and typical uses: low‑density single family housing; see § 15.37 for placement, yards, and permitted uses (§ 15.37.010–110 ).
• Sign specifics:
  • Residential identification and home occupation signs: the code allows small residence identification signs and home‑occupation signage limits. A home occupation may display one on‑site sign up to 2 sq ft (no lighted signs) under Chapter 15.78 (home occupation rules) — see § 15.78.020.16 for the sign limit and related conditions .
  • Political and for‑sale signs have residential size/time limits in § 15.62.030 . Note ADU applicants should consult California ADU law for separate state rules California ADU law.

C / LC / CC / SC / HVC — Commercial Districts

• Purpose and typical uses: local, community, service, highway/visitor commercial activities; see § 15.39–15.43 for district details (§ 15.39–15.43 ).
• Sign specifics (most decision‑relevant):
  • Aggregate sign area for a commercial establishment is 1 sq ft per ft of building site frontage, up to 250 sq ft total (§ 15.62.060.3.1 ).
  • Wall signs must be mounted flat and cannot project above cornice/roofline; monument, wall, or pole signs are allowed forms (§ 15.62.060.3–4 ).
  • Lighting: illumination must be arranged to avoid glare on adjacent properties or public streets (§ 15.62.060.6 ). See the county adoption of state codes for technical lighting rules California Building Standards Code (§ 15.72.120–137 ).

M / MP — Industrial / Industrial Park

• Purpose and typical uses: industrial sites, manufacturing, warehouses, clustered industrial parks (§ 15.44 and § 15.51) file.
• Sign specifics:
  • Industrial sign area: 2 sq ft per ft of building site frontage, to a maximum of 500 sq ft (§ 15.62.060.3.2 ).
  • Off‑premises advertising structures may be permitted in M only with a conditional use permit (§ 15.62.070 ).
  • Freestanding pole signs up to 50 ft height are allowed where the sign‑area standard is met (§ 15.62.060.5 ).

AV / AVH — Airport / Airport Hazard Zones

• The airport‑related chapters (e.g., § 15.53 AV and § 15.55 AVH) impose height, lighting, and safety restrictions that can affect sign height/placement and require additional coordination with airport managers; the general zoning code states more stringent rules govern where conflicts arise (§ 15.53, § 15.55 file). Nonconforming signs near airports may be required to accept marking/lighting for aviation safety (§ 15.55.060 ).

Planned Developments / Mobilehome Parks / RPM etc.

• Planned developments and special plan districts require a unified sign theme: the county requires a “common theme” for signs as part of the development plan; signs in the development must conform to that theme (§ 15.52.120 ).
• Mobilehome parks: the park must provide bulletin boards and directional signage for internal circulation (see § 15.50.030 for sign requirements in mobilehome parks) .

Quick Standards Table (most decision‑relevant)

Practical guidance & interpretation notes

• Always start from § 15.62 — it is the primary signage chapter for unincorporated Glenn County (see § 15.62.010–080 ). If your parcel is in a special district (airport hazard, planned development, mobilehome park, etc.) check the district chapter after § 15.62 because district chapters can add conditions (e.g., planned developments require a sign theme — § 15.52.120 ).
• Lighting: the county requires illumination to avoid glare (§ 15.62.060.6 ) and the county has adopted the state building/green/energy codes that affect internally/externally illuminated signs (see §§ 15.72.120–137 and the state code references) . Consult the county building office and the state California Building Standards Code before ordering an illuminated sign.
• Right‑of‑way: the county forbids installing signs in county streets/road rights‑of‑way unless you obtain a variance or an encroachment permit; separately the Public Works encroachment chapter requires an encroachment permit for advertising in the ROW (§ 15.62.020.4; 15.12.010) file. Do not place a sign in the ROW without approvals.
• Off‑premises and billboards: these are restricted and need a CUP; the code text literally lists “RZ, AE, AP C, and M” as the only zones where off‑premises advertising structures may be permitted by CUP — read that language closely and verify zone names with staff before assuming applicability (§ 15.62.070 . See Risks & Ambiguities below.)

Checklist — what an applicant must satisfy (pre‑installation)

• Confirm parcel is in unincorporated Glenn County and identify the zoning district (check the official zone maps) (§ 15.01.030 ).
• Ensure written consent of the property owner is on file with the planning authority (required for any regulated sign) (§ 15.62.020.1 ).
• Determine whether your sign is exempt (agricultural, political, temporary real estate, etc.) (§ 15.62.030 ).
• For directional signs: prepare plans (location and copy) and submit to the director for approval before installation; after installation file for a certificate of zoning compliance and provide a photo (§ 15.62.050.7–8 ).
• If sign is part of a new development or requires site plan review, include signs in the site plan submittal; signs are one of the items the planning director reviews under site plan review (§ 15.13.020–050; § 15.13.050 findings) . Also check the county Design Review rules if your development is subject to design review.
• If you propose off‑premises advertising/billboards, prepare an application for a conditional use permit — § 15.62.070 limits where these may be allowed and CUP is required .
• If the sign or supports would encroach on county ROW, contact Public Works and obtain an encroachment permit before placing signs in or over the ROW (§ 15.12.010) .
• For illuminated signs, confirm lighting complies with county glare rules (§ 15.62.060.6) and applicable state technical standards in the adopted California codes (§ 15.72.120–137) file.
• Verify if a building permit is needed for structural supports or electrical work; county has adopted the state building code — check with the Building Department and California Building Standards Code (§ 15.72.120–137) .

Risks & Ambiguities

Plain‑English summary

In unincorporated Glenn County, signs are regulated primarily by Chapter 15.62: there are exemptions (agricultural, real estate, political, etc.), strict prohibitions (flashing/moving lights, sound signs, traffic‑confusing signs), and clear numeric limits (commercial/industrial sign area, monument/pole heights, directional sign sizes). Off‑premises billboards are tightly restricted and usually require a conditional use permit; signs cannot be placed in county road rights‑of‑way without permits. Always check the exact zone rules, file the necessary site plan/permit materials, and coordinate with Planning and Public Works before installing a sign (§ 15.62.010–080, § 15.12.010) file.

Source References

• § 15.62.010–080 (Sign Standards: purpose, general provisions, exempt signs, prohibited signs, directional signs, permitted appurtenant sign area, off‑premises advertising, maintenance) — § 15.62.010–080 .
• § 15.62.050 (Directional signs) — § 15.62.050 .
• § 15.62.060 (Permitted appurtenant sign area; commercial/industrial aggregate area; monument/pole signs; illumination rules) — § 15.62.060 .
• § 15.62.070 (Off‑premises advertising structures; CUP requirement) — § 15.62.070 .
• § 15.62.080 (Sign maintenance requirement) — § 15.62.080 .
• Sign definitions (monument sign, directional sign, off‑premises, etc.) — § 15.02 definitions (see “Sign, monument”, “Sign, directional”, “Sign, off‑premises”) .
• § 15.78.010–020 (Home Occupation — one on‑site sign up to 2 sq ft; other home‑occupation rules) — § 15.78.020.16 .
• § 15.13 (Site Plan Review applicability and findings which include signs) — § 15.13.020–050 .
• § 15.52.120 (Planned development sign theme requirement) — § 15.52.120 .
• § 15.12.010 (Encroachment permits — advertising signs in county ROW) — § 15.12.010 .
• County adoption of state building standards (Title 24 references adopted) — § 15.72.120–137 (California codes adopted) .
• Glenn County Unified Development Code (full title and divisions) — Title (Unified Development Code, Division 15) .

Retrieved passages

• Glenn County Zoning Code (§ 2) High relevance show source text
• Glenn County Zoning Code (§ 2) High relevance show source text
• Glenn County Zoning Code (chapter shall) High relevance show source text
• Glenn County Zoning Code (§ 2) Medium relevance show source text
• Glenn County Zoning Code (§ 2) Medium relevance show source text
• Glenn County Zoning Code (§ 2) Medium relevance show source text
• Glenn County Zoning Code (title but) Medium relevance show source text
• Glenn County Zoning Code (title but) Medium relevance show source text
• Glenn County Zoning Code (§ 2) High relevance show source text
• Glenn County Zoning Code (section without) Medium relevance show source text
• Glenn County Zoning Code (chapter shall) Medium relevance show source text
• Glenn County Zoning Code (chapter and) Medium relevance show source text
• Glenn County Zoning Code Medium relevance show source text
• Glenn County Zoning Code (section in) Medium relevance show source text
• Glenn County Zoning Code (§ 2) Medium relevance show source text
• CFC § 2 (§ 2) Medium relevance show source text
• CFC § 15 (§ 15) Medium relevance show source text
• Glenn County Zoning Code (§ 2) Medium relevance show source text
• Glenn County Zoning Code (§ 2) Medium relevance show source text
• Glenn County Zoning Code (§ 2) Medium relevance show source text

Cited sections

• § **15.62.010–080** (Sign Standards: purpose, general provisions, exempt signs, prohibited signs, directional signs, permitted appurtenant sign area, off‑premises advertising, maintenance) — § **15.62.010–080** .
• § **15.62.050** (Directional signs) — § **15.62.050** .
• § **15.62.060** (Permitted appurtenant sign area; commercial/industrial aggregate area; monument/pole signs; illumination rules) — § **15.62.060** .
• § **15.62.070** (Off‑premises advertising structures; CUP requirement) — § **15.62.070** .
• § **15.62.080** (Sign maintenance requirement) — § **15.62.080** .
• Sign definitions (monument sign, directional sign, off‑premises, etc.) — § **15.02** definitions (see “Sign, monument”, “Sign, directional”, “Sign, off‑premises”) .
• § **15.78.010–020** (Home Occupation — one on‑site sign up to 2 sq ft; other home‑occupation rules) — § **15.78.020.16** .
• § **15.13** (Site Plan Review applicability and findings which include signs) — § **15.13.020–050** .
• § **15.52.120** (Planned development sign theme requirement) — § **15.52.120** .
• § **15.12.010** (Encroachment permits — advertising signs in county ROW) — § **15.12.010** .
• County adoption of state building standards (Title 24 references adopted) — § **15.72.120–137** (California codes adopted) . (Title 24)
• Glenn County Unified Development Code (full title and divisions) — Title (Unified Development Code, Division 15) . (title and)
• GlennCounty_ZoningCode.md