Local zoning · Sonoma County

Sonoma County — Signage

Signage under the Sonoma County local zoning and planning code, with the controlling citations.

Last reviewed: July 6, 2026

Overview

In unincorporated areas of Sonoma County, signs are governed by Article 84 of the Sonoma County Zoning Ordinance (Sonoma County Code Chapter 26). The rules apply countywide across all base zoning districts and are further shaped by district-specific allowances in a county “Figure A” matrix, as well as special rules for scenic corridors and the Industrial Park (MP) district. If a sign type is not expressly permitted or exempt, it is prohibited under the ordinance.

If a sign is not listed as permitted in § 26-84-030 or exempt, it is prohibited in unincorporated areas of Sonoma County. § 26-84-010(e)

How the sign code is organized

Purpose and applicability: The article’s purpose is community appearance and safety; the general provisions apply in all base districts and can be superseded by applicable plan policies and guidelines (§ 26-84-005; § 26-84-010(a)) .
Definitions: Key terms like “appurtenant sign,” “directional sign,” and “outdoor advertising sign/structure” are defined in § 26-84-020 .
Permitted sign types: § 26-84-030 lists permitted categories (on-site informational, directional, appurtenant, real estate, campaign/political, outdoor advertising) and ties each to permit types by base district in Figure A (§ 26-84-030(a)) .
Scenic corridors: Height, message content, color, and spacing for outdoor advertising along designated scenic corridors (including the Highway 101 Scenic Corridor) are restricted (§ 26-84-030(g)(4)) .
MP district: The Industrial Park (MP) district has its own additional sign limits (§ 26-12-050(G)) and is cross-referenced in § 26-84-030(d) .
Enforcement and nonconformities: Removal/abatement procedures and penalties appear in Article 92; amortization of certain nonconforming signs is in § 26-94-080 .

For overall code context, see the county’s zoning overview, Zoning, and Development Standards. Design approvals often involve Design Review and, in scenic or historic contexts, Overlay Districts and Historic Preservation. Structural/electrical sign construction is addressed separately under the California Building Standards Code.

Countywide sign standards you will use most

General provisions: Apply in all base districts; plan policies/guidelines may supersede (§ 26-84-010(a)) .
Prohibited signs: Includes banners/pennants, flashing/animated signs, overly bright illumination, and any sign blocking ingress/egress (§ 26-84-010(e)(1)–(4)) .
Exempt signs: Certain governmental and interior signs are exempt (§ 26-84-010(f)) .
On-site informational signs: Up to 6 sq ft and 6 ft high with no advertising message (or up to 2 sq ft for wayfinding) are allowed without prior permit (§ 26-84-030(b)) .
Directional signs: Typically require a Use Permit (UP) per Figure A; waiver possible for ≤8 sq ft with Design Review (DR) (§ 26-84-030(c)) .
Appurtenant (on-site business) signs: Generally require Design Review; maximum 32 sq ft; monument signs max 6 ft high; lighting must be low-intensity or shielded (§ 26-84-030(d)(1)–(5)) .
Real estate signs: On-site signs are allowed without prior permit if unlit, on the property, removed after close, and within size limits that scale by lot size; off-site real estate signs are limited and typically need a Zoning Permit (ZP) or UP, with stronger controls in scenic corridors (§ 26-84-030(e)) .
Campaign and political signs: Zoning Permit required; R1 parcels are limited to two single-faced 16 sq ft signs (or one double-faced of 16 sq ft/face); other districts allow up to two single-faced or one V-type double-faced 32 sq ft/face; timing, height (≤7 ft), and safety conditions apply (§ 26-84-030(f)) .
Outdoor advertising structures/signs (off-site): Allowed only in certain commercial/industrial districts with a UP; spacing, proximity to landmarks, and additional scenic-corridor restrictions apply (§ 26-84-030(g)) .
Viticultural area signs: Require a ZP in districts shown in Figure A; subject to detailed size/height/panel specs (§ 26-84-030(h)) .

Consider landscape integration at sign bases in scenic areas (§ 26-84-030(g)(4)(v)); also see Landscaping and Screening.

Key decision rules at a glance

Topic	Core Sonoma County rule (unincorporated areas)	Code Reference
If it’s not listed or exempt	Not permitted	§ 26-84-010(e)
On-site informational sign (by right)	Up to 6 sq ft and 6 ft tall; no advertising message	§ 26-84-030(b)(1)
Directional sign	UP required per Figure A; waiver to DR if ≤8 sq ft	§ 26-84-030(c)
Appurtenant sign basics	DR required; 32 sq ft max; monument ≤6 ft; lighting controlled	§ 26-84-030(d)
Real estate, on-site	Permit not required if unlit, on property, timely removal, size by lot area	§ 26-84-030(e)(1)–(v)
Real estate, off-site	Often ZP or UP per Figure A; scenic corridors = UP; ≤16 sq ft/face, ≤4 ft tall	§ 26-84-030(e)(2), (i)–(vii)
Campaign/political	ZP required; size/number/timing/height limits	§ 26-84-030(f)
Outdoor advertising	Only in select districts with UP; spacing/height/content rules	§ 26-84-030(g)
Scenic corridor caps	On-site only; ≤10 ft high on Hwy 101, ≤6 ft on other scenic corridors; landscape base; subdued colors	§ 26-84-030(g)(4)
Viticultural area signs	ZP; ≤20 ft height; up to 15 panels; specific header/panel sizes	§ 26-84-030(h)
MP district extra rules	District entrance sign (≤175 sq ft/≤6 ft); detached appurtenant (≤32 sq ft/≤4 ft) per frontage; attached total ≤3% wall area	§ 26-12-050(G)

District-by-district: what permits are needed for each sign type

Figure A in § 26-84-030 assigns permits by base district for Directional (DIR), Appurtenant (APP), Off-site Real Estate (RE Off), Campaign/Political (POL), Outdoor Advertising (OA), and Viticultural (VIT). “Not listed” means not permitted. All districts remain subject to the countywide dimensional rules above.

Note: DIR = Use Permit (UP) unless waived per § 26-84-030(c); APP = Design Review (DR) per § 26-84-030(d); RE Off = ZP or UP per Figure A; POL = ZP per § 26-84-030(f); OA = UP where allowed; VIT = ZP. Figure A, § 26-84-030(a)

LIA — Land Intensive Agriculture (unincorporated areas)

DIR: UP; APP: DR; RE Off: ZP; POL: ZP; OA: Not permitted; VIT: ZP (§ 26-84-030 Figure A) .
Dimensional notes: APP signs ≤32 sq ft; monument ≤6 ft (§ 26-84-030(d)) .

LEA — Land Extensive Agriculture

DIR: UP; APP: DR; RE Off: ZP; POL: ZP; OA: Not permitted; VIT: ZP (§ 26-84-030 Figure A) .

DA — Diverse Agriculture

DIR: UP; APP: DR; RE Off: ZP; POL: ZP; OA: Not permitted; VIT: ZP (§ 26-84-030 Figure A) .

RRD — Resources & Rural Development

DIR: UP; APP: DR; RE Off: ZP; POL: ZP; OA: Not permitted; VIT: ZP (§ 26-84-030 Figure A) .

RRDWA — Resources & Rural Development (Water Area)

DIR: UP; APP: DR; RE Off: ZP; POL: ZP; OA: Not permitted; VIT: ZP (§ 26-84-030 Figure A) .

TP — Timberland Production

DIR: Not listed; APP: DR; RE Off: ZP; POL: ZP; OA: Not permitted; VIT: ZP (§ 26-84-030 Figure A) .

AR — Agricultural & Residential

DIR: UP; APP: DR; RE Off: ZP; POL: ZP; OA: Not permitted; VIT: ZP (§ 26-84-030 Figure A) .

RR — Rural Residential

DIR: Not listed; APP: DR; RE Off: ZP; POL: ZP; OA: Not permitted; VIT: ZP (§ 26-84-030 Figure A) .

R1 — Single-Family Residential

DIR: Not listed; APP: DR; RE Off: UP; POL: ZP; OA: Not permitted; VIT: ZP (§ 26-84-030 Figure A; see special POL size caps in R1) .

R2 — Low-Density Multiple Residential

DIR: Not listed; APP: Not listed; RE Off: UP; POL: ZP; OA: Not permitted; VIT: ZP (§ 26-84-030 Figure A) .

R3 — Medium/High-Density Multiple Residential

DIR: Not listed; APP: Not listed; RE Off: UP; POL: ZP; OA: Not permitted; VIT: ZP (§ 26-84-030 Figure A) .

PC — Planned Community

DIR: Not listed; APP: DR; RE Off: UP; POL: ZP; OA: Not permitted; VIT: ZP (§ 26-84-030 Figure A) .

CO — Administrative/Professional Office

DIR: Not listed; APP: DR; RE Off: UP; POL: ZP; OA: Not permitted; VIT: ZP (§ 26-84-030 Figure A) .

C1 — Neighborhood Commercial

DIR: UP; APP: DR; RE Off: UP; POL: ZP; OA: UP; VIT: ZP (§ 26-84-030 Figure A) .

C2 — Retail Business & Service

DIR: UP; APP: DR; RE Off: UP; POL: ZP; OA: UP; VIT: ZP (§ 26-84-030 Figure A) .

C3 — Limited Highway Service

DIR: UP; APP: DR; RE Off: UP; POL: ZP; OA: UP; VIT: ZP (§ 26-84-030 Figure A) .

LC — Limited Commercial

DIR: UP; APP: DR; RE Off: UP; POL: ZP; OA: UP; VIT: ZP (§ 26-84-030 Figure A) .

RC — Retail Commercial

DIR: UP; APP: DR; RE Off: UP; POL: ZP; OA: UP; VIT: ZP (§ 26-84-030 Figure A) .

AS — Agricultural Services

DIR: UP; APP: DR; RE Off: UP; POL: ZP; OA: Not permitted; VIT: ZP (§ 26-84-030 Figure A) .

K — Recreation/Resource-related (K)

DIR: UP; APP: DR; RE Off: UP; POL: ZP; OA: Not permitted; VIT: ZP (§ 26-84-030 Figure A) .

MP — Industrial Park

DIR: Not listed; APP: See MP-specific standards; RE Off: UP; POL: ZP; OA: UP; VIT: ZP (§ 26-84-030(d), MP cross-ref; § 26-12-050(G)) .

M1 — Limited Urban Industrial

DIR: UP; APP: DR; RE Off: UP; POL: ZP; OA: UP; VIT: ZP (§ 26-84-030 Figure A) .

M2 — General Industrial

DIR: UP; APP: DR; RE Off: UP; POL: ZP; OA: UP; VIT: ZP (§ 26-84-030 Figure A) .

M3 — Intensive Industrial

DIR: UP; APP: DR; RE Off: UP; POL: ZP; OA: UP; VIT: ZP (§ 26-84-030 Figure A) .

PF — Public Facilities

DIR: Not listed; APP: DR; RE Off: UP; POL: ZP; OA: Not permitted; VIT: ZP (§ 26-84-030 Figure A) .

Scenic corridors and overlays

Outdoor advertising in scenic corridors is further limited to on-site identification only; height caps are lower (≤10 ft on Highway 101 Scenic Corridor; ≤6 ft elsewhere), with required landscaping at the base and subdued colors/materials (§ 26-84-030(g)(4)) . Confirm any applicable scenic or historic overlay standards during Design Review and consult Overlay Districts.

MP district details (Industrial Park)

In addition to § 26-84-030(d), MP parcels have:

One district entrance sign per entrance, ≤175 sq ft and ≤6 ft high, no advertising copy (§ 26-12-050(G)(1)) .
One detached appurtenant sign per street frontage, ≤32 sq ft and ≤4 ft high (additional signs allowed with long frontages and spacing) (§ 26-12-050(G)(2)) .
Total attached appurtenant sign area ≤3% of wall face; fascia/roof signs not permitted (§ 26-12-050(G)(3)) .

Enforcement, nonconforming, and adjustments

Nonconforming signs: Certain pre-existing outdoor advertising/appurtenant/directional signs are treated as nonconforming and may be amortized/removed consistent with state law (§ 26-94-080) . See Nonconforming Uses.
Abatement and penalties: Unlawful signs may be ordered removed after hearing; penalties can be misdemeanor-level and accrue daily (§ 26-92-230; § 26-92-260) .
Flexibility: Directional UPs can be waived for small signs; additional appurtenant sign area in MP can be allowed via Use Permit (or waiver) and Design Review (§ 26-84-030(c), (d)) . For out-of-the-box needs, consult Variances and Exceptions.

Checklist

Confirm parcel is in unincorporated Sonoma County and identify its base zoning district on the county map; note any scenic/historic overlays.
Identify your sign type(s): on-site informational, directional, appurtenant, real estate (on/off-site), campaign/political, outdoor advertising, viticultural (§ 26-84-030(a)) .
Use Figure A to determine the required entitlement by district (DR, ZP, UP) (§ 26-84-030(a)) .
Check countywide dimensional and lighting limits (size, height, illumination) and any MP-specific standards if applicable (§ 26-84-030(d); § 26-12-050(G)) .
For scenic corridors, ensure on-site-only messaging, reduced heights, landscaping, and subdued colors (§ 26-84-030(g)(4)) .
Verify prohibited sign features are avoided (banners/pennants; flashing; glare; obstruction of ingress/egress) (§ 26-84-010(e)) .
If applicable, prepare a coordinated sign program for multi-tenant sites (§ 26-84-030(d)(2)) .
Plan for removal timelines on temporary/campaign/real estate signs (§ 26-84-030(e)–(f)) .
Coordinate with Design Review and confirm any site impacts (e.g., sight distance, Parking circulation).
Structural/electrical compliance is addressed by the California Building Standards Code (handled separately from zoning).

Risks & Ambiguities

Issue	Why it matters	What to verify
Scenic corridor status	Triggers stricter height/content/landscape rules	Whether parcel frontage is within a designated scenic corridor (§ 26-84-030(g)(4))
District permit type	Wrong permit can delay projects	The correct Figure A entitlement (DR/ZP/UP) for your base district (§ 26-84-030(a))
R2/R3 appurtenant signs	Figure A shows blanks	If appurtenant signs are truly disallowed in R2/R3 or addressed via another entitlement. Verify with the jurisdiction. Figure A (§ 26-84-030)
MP sign program	MP has extra caps and formats	That your design follows § 26-12-050(G) in addition to § 26-84-030(d)
Political sign timing/removal	Common enforcement issue	90-day pre-election window; removal within 20 days after election; height ≤7 ft (§ 26-84-030(f))
Off-site real estate in scenic corridors	Different permit threshold	UP required in scenic corridors even if ZP elsewhere (§ 26-84-030(e)(2))
Outdoor advertising spacing	Affects billboard siting	Spacing near highways/business areas; distance from monuments (§ 26-84-030(g)(1)–(3))
Enforcement/abatement	Risk of removal and penalties	Abatement and misdemeanor penalties in Article 92 (§ 26-92-230; § 26-92-260)

Plain-English Summary

For unincorporated Sonoma County, start by matching your sign to a listed category in § 26-84-030 and then check Figure A for the permit type your zoning district requires. Most on-premise business signs need Design Review; off-site signs and billboards are tightly controlled and often need a Use Permit, with even stricter rules along scenic corridors. If a sign type isn’t listed—or looks like a banner, blinks, or causes glare—it’s almost certainly not allowed.

Source References

§ 26-84-005 (Purpose) and § 26-84-010 (General sign provisions)
§ 26-84-020 (Definitions)
§ 26-84-030(a)–(h) (Permitted signs; Figure A; standards for informational, directional, appurtenant, real estate, campaign/political, outdoor advertising; viticultural)
§ 26-12-050(G) (MP district sign standards)
§ 26-94-080 (Nonconforming signs)
§ 26-92-230; § 26-92-260 (Abatement; penalties)

Sources

Retrieved passages

Sonoma County Zoning Code (§ 1) High relevance
Sonoma County Zoning Code (§ 1) High relevance
Sonoma County Zoning Code (§ 1) High relevance
Sonoma County Zoning Code High relevance
Sonoma County Zoning Code (§ 2) High relevance
Sonoma County Zoning Code (chapter which) High relevance
Sonoma County Zoning Code (Section 26-44-030.) High relevance
Sonoma County Zoning Code High relevance
Sonoma County Zoning Code (Section 26-84-030) High relevance
Sonoma County Zoning Code (§ 1) High relevance
Sonoma County Zoning Code Medium relevance
Sonoma County Zoning Code (§ 1) Medium relevance

Cited sections

§ 26-84-005 (Purpose) and § 26-84-010 (General sign provisions) (§ 26-84-005)
§ 26-84-020 (Definitions) (§ 26-84-020)
§ 26-84-030(a)–(h) (Permitted signs; Figure A; standards for informational, directional, appurtenant, real estate, campaign/political, outdoor advertising; viticultural) (§ 26-84-030)
§ 26-12-050(G) (MP district sign standards) (§ 26-12-050)
§ 26-94-080 (Nonconforming signs) (§ 26-94-080)
§ 26-92-230; § 26-92-260 (Abatement; penalties) (§ 26-92-230)
SonomaCounty_ZoningCode.md

Official Sonoma County code library

Frequently asked questions

Are banners or flashing signs allowed in unincorporated Sonoma County?

No. Banners, pennants, promotional flags, and flashing/animated signs are listed among prohibited signs. Also prohibited are overly bright illuminated signs and any sign blocking ingress/egress. See § 26-84-010(e) for the full list of prohibited features .

Do I need Design Review for a business sign on my building?

Usually yes. Appurtenant (on-site business) signs generally require Design Review and must meet size, height, and lighting limits—32 sq ft maximum area and 6 ft maximum height for monument styles (§ 26-84-030(d)) .

What’s different if my property fronts the Highway 101 Scenic Corridor?

Outdoor advertising is more restricted: only on-site identification is allowed, height is capped at 10 ft on Highway 101 (6 ft on other scenic corridors), landscaped bases are required, and colors should be subdued (§ 26-84-030(g)(4)) .

How many political signs can I place and how big can they be?

With a Zoning Permit, R1 parcels may have up to two single-faced 16 sq ft signs (or one double-faced of 16 sq ft/face); all other districts may have up to two single-faced or one V-type double-faced 32 sq ft/face. Signs must be removed within 20 days after the election and may not exceed 7 ft in height (§ 26-84-030(f)) .

Are off-site real estate signs allowed without a permit?

Only if very limited: up to 3 days, ≤4 sq ft, ≤4 ft high, unlit, and not on a scenic corridor. Otherwise, they typically require a Zoning Permit or Use Permit per your base district, and a Use Permit is always required in scenic corridors (§ 26-84-030(e)(2)) .

Can the county require me to remove a noncompliant billboard?

Yes. The zoning administrator can order abatement and removal after a hearing, and violations can be charged as misdemeanors with daily penalties (§ 26-92-230; § 26-92-260) .

What special rules apply to signs in the MP (Industrial Park) district?

MP parcels may have a district entrance sign (≤175 sq ft/≤6 ft), one detached appurtenant sign per frontage (≤32 sq ft/≤4 ft), and total attached sign area ≤3% of the building face. Fascia/roof signs are not allowed (§ 26-12-050(G)) .

Are viticultural area signs allowed for wineries?

Yes, with a Zoning Permit in districts shown by Figure A. They have strict specs: ≤20 ft total height, up to 15 name panels of fixed sizes, and a standardized oval header (§ 26-84-030(h)) .

What if my zoning (e.g., R2 or R3) shows no appurtenant sign allowance in Figure A?

If a cell is blank in Figure A, that sign type isn’t permitted by the matrix. Where ambiguity exists (e.g., R2/R3), confirm with Permit Sonoma before applying. Figure A in § 26-84-030 governs .

Are building and electrical aspects of signage covered here?

No. This page covers zoning. Structural and electrical safety, illumination hardware, and similar issues are addressed under the California Building Standards Code (Title 24), separate from zoning approvals.

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