Local zoning · Colusa

Colusa — Signage

Q: How large can a home address plaque be in Colusa?

A residential name or address sign may be up to 2 square feet and is allowed without a sign permit — one per residence. See § 31.03(a)(1) for this allowance .

Q: What temporary signs are allowed for private events?

Private event signs: individual signs ≤ 6 sq ft , total ≤ 24 sq ft for a parcel; time‑limits apply (event signs must be taken down within days stated in § 31.03(a)(6–8) ). See § 31.03(a)(6–8) for the time windows and rules .

Q: What happens to an illegal or nonconforming sign?

Illegal signs must be removed within one year from the effective date of the ordinance; the nonconforming sign section describes timelines and required remedies — see § 31.05 for removal and amortization rules .

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

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Last reviewed: July 1, 2026

Overview

Colusa regulates signs through the City Zoning Code in Title 17 Zoning, primarily in Article 31 — Outdoor Advertising and Sign Regulations. The Article sets citywide rules on what sign types are allowed without a permit, what needs a minor use permit or major use permit, and what is prohibited; it also cross-references district-level rules (for example in the C‑G and various combining districts). See the citywide purpose language in § 31.01 and permit requirement in § 31.02 for the controlling framework .

Note: this page focuses strictly on the Colusa zoning/signage rules (Title 17). For building-safety or structural permits consult the California Building Standards Code.

When you read this page you may also need local rules that interact with signs such as parking and development standards — see Colusa Parking and Colusa Development Standards. If your property sits inside a combining overlay (for example the F, FP, or H overlays) check Colusa Overlay Districts. For design or aesthetic review triggers also consult Colusa Design Review.

Governing text — quick pointers

Purpose and measurement rules: § 31.01 (Article 31) .
Permits and fees: § 31.02 — most non-exempt signs require a minor use permit or use permit .
Allowed sign types (no permit needed if they meet the listed limits): § 31.03(a) (detailed lists for residential, temporary signs, banners, portable signs, construction signs, flags, etc.) .
Exception signs that can be approved only with a major use permit (flashing signs, off‑site advertising, stationary vehicle advertising >120 hours, etc.) and required findings: § 31.03(c) .
Prohibited signs: § 31.04 (safety, obscene content, interference with traffic, illegible/dilapidated signs, certain painted signs except as allowed) .
Nonconforming signs: amortization/removal rules: § 31.05 .
Special operational signage restriction for cannabis businesses: § 21.5.08(a) (no exterior signs that evidence cannabis operations) .

District-by-district breakdown (Colusa-specific)

Note: Article 31 is the primary sign ruleset that applies citywide; district subsections modify or add requirements where the code explicitly does so. Below are the districts and the signage guidance shown in the Colusa zoning materials retrieved.

R (residential) — R‑1, R‑2, R‑3, R‑4

Purpose / typical uses: single‑ and multi‑family housing and accessory residential uses (see Title 17 district tables) .
Key signage standards that apply to residential uses (Article 31, universal list allowed without a sign permit):
- Residential name/address sign: one (1) per residence, up to 2 sq ft (flat against building) — § 31.03(a)(1) .
- Home occupation sign: up to 2 sq ft, flat against wall — § 31.03(a)(2) .
- For sale/rent sign: residential up to 6 sq ft (one per street frontage, under 6 ft high) — § 31.03(a)(3) .
- Temporary / noncommercial signs: individual signs ≤ 6 sq ft, total for parcel ≤ 24 sq ft; event signs and time limits also in § 31.03(a)(6–9) .
Where it applies: in all lots zoned R‑1 through R‑4; other uses in those districts are subject to Article 31 limits unless the district text states otherwise.

Practical note: some multifamily or institutional uses in R‑3/R‑4 may be subject to additional or different allowances — check the specific district provisions and consult the planning department for site-specific interpretation (Verify with the jurisdiction).

C‑N / C‑G — Neighborhood & General Commercial

Purpose / typical uses: retail, offices, services (see Article 9 and Article 10 for permitted uses) .
Key sign standards:
- For general commercial building signs, Colusa limits projecting and wall signs: exterior signs parallel to the building wall shall not project more than 2 feet, shall not exceed 50 sq ft total area, and shall not project above the roof ridge line — see § 9.02(f) and Article 31 for permitting rules .
- Outdoor advertising on/adjacent to commercial uses must not exceed 2 sq ft per lineal foot of lot frontage for all such signs on the property — Article 31 language applied to commercial frontage .
Where it applies: C‑N and C‑G zones and any parcels where a commercial use is present; major tenant/monument signs or freeway‑oriented signs may require discretionary review or a major use permit under § 31.03(c) .

Link: if your sign location implicates access, curb cuts, or parking counts, coordinate with Colusa Parking.

M‑1 — Light Industrial

Purpose / typical uses: light industrial and warehousing (Article 12) .
Key signage standards: Article 12 defers to the general sign rules; therefore Article 31 controls sign type, area, and permit triggers unless a specific industrial‑district clause modifies them (Not found in retrieved materials — verify with the jurisdiction). See § 31.01–31.03 for permitted types and permit thresholds .
Where it applies: in M‑1 zones across the city.

F (Floodplain combining), FP, H (height combining), P (parking combining), A‑O (adult‑oriented combining)

Purpose / typical uses: These are combining overlay districts that add conditions to the base zone (Articles 23–25, 27) .
Signage notes:
- In certain combining districts the code explicitly restricts or conditions outdoor advertising. For example, within an F combining context the code says no outdoor advertising signs except those that pertain directly to permitted commercial uses and must not exceed 2 sq ft per lineal foot of frontage; directional/informational signs may be allowed with a use permit — see the combining‑district language in the code text (Article 11 / F combining excerpts) .
- Adult‑oriented businesses must comply with Article 27 and Article 31 for signage; the A‑O regulations specifically state signage shall be in accordance with Article 31 (see § 27.03(e) and § 27.04 references) .
Where it applies: to parcels that show the combining symbol on the zoning map; check Colusa Overlay Districts.

Practical note: combining districts frequently add use‑permit requirements for directional or off‑site signs — plan for discretionary review where overlays are present.

Most decision‑relevant standards (at‑a‑glance)

Item	Standard (most common numeric limits)	Code Reference
Citywide sign purpose & measurement rules	See Article 31; sign area measured as entire face; noncommercial message substitution allowed	§ 31.01
Permit trigger	Most signs require a minor use permit or use permit unless specifically exempt	§ 31.02
Residential name/address sign	1 per residence, ≤ 2 sq ft	§ 31.03(a)(1)
Home occupation sign	≤ 2 sq ft, flat against wall	§ 31.03(a)(2)
For sale / rent sign	Residential ≤ 6 sq ft; Non‑residential ≤ 20 sq ft; 1 per street frontage, < 6 ft high (residential)	§ 31.03(a)(3)
Portable signs	Max 2 per business; ≤ 4 ft high; ≤ 10 sq ft per side	§ 31.03(a)(4)
Temporary business/banners	≤ 32 sq ft (temporary banner for new business)	§ 31.03(a)(5)
Temporary event signs (private)	Individual signs ≤ 6 sq ft; total ≤ 24 sq ft; event time limits apply	§ 31.03(a)(6–8)
Construction/project sign (site)	§ 31.03(a)(11): signs on property undergoing permitted construction ≤ 32 sq ft each side; max two sides 64 sq ft total; ≤ 8 ft height; ≥ 10 ft setback from property line; one per street frontage; removed within 30 days of final inspection/CO	§ 31.03(a)(11)
Major exceptions (discretionary)	Flashing/intermittent, off‑site advertising, stationary vehicle advertising >120 hours — allowed only with a major use permit and required findings	§ 31.03(c)
Prohibited signs (examples)	Signs causing traffic hazards, obstructing fire escapes, emitting sound (except permitted drive‑through/menu), obscene content, poorly maintained/illegible	§ 31.04(a)–(h)
Painted wall signs / murals	Painted commercial signs are generally prohibited; exceptions for artistic murals with major use permit or sole identification approved by Planning Director — see prohibited signs clause	§ 31.04(i)
Nonconforming signs	Illegal signs must be removed within 1 year from the effective date of the ordinance; conforming/nonconforming procedures in § 31.05	§ 31.05

Practical guidance & interpretation (plain‑English synthesis)

Start with § 31.03(a): many small, residential, and temporary signs are allowed without a formal sign permit if you meet the numeric limits (address, for‑sale, temporary event signs, portable signs) .
If your sign is larger, illuminated, projects above the roofline, is on a freestanding pole, or is intended to attract freeway traffic, plan on a discretionary process — either a minor use permit or a major use permit for the most unusual or potentially impactful signs (see § 31.02 and § 31.03(c)) .
Municipal code expressly allows substitution of noncommercial messages on authorized sign structures (message substitution) — this protects noncommercial speech rights while still requiring compliance with physical standards (§ 31.01) .
Painted wall signage is a common grey area: the code generally prohibits painted commercial wall signs except as an approved mural or specific planning‑director authorization — get written confirmation before painting logos or commercial text on a façade (§ 31.04(i)) .
Cannabis businesses face a more restrictive rule: no exterior signage that advertises or evidences cannabis operations (interior signs are permitted if not visible from outside) — this is contained in § 21.5.08(a) for cannabis uses, and signage for dispensaries is reviewed with their special use permit .

If you need help checking frontage calculations, building‑mounted area, or how the sign interacts with parking/loading, consult the Colusa Development Standards and the Colusa Parking pages; design or aesthetic triggers may require Colusa Design Review.

Checklist (what an applicant must satisfy before installing a sign)

Confirm sign type is either exempt or requires a minor use permit or major use permit per § 31.02 .
Measure sign area per § 31.01 rules (entire face; double‑faced exceptions) and confirm it meets the numeric limits in § 31.03(a) (or secure discretionary permit) .
Confirm sign position does not create traffic or visibility hazards or obstruct required fire egress (prohibited in § 31.04) .
If sign is illuminated, flashing, a moving image, off‑site advertising, or on a vehicle intended to advertise while stationary > 120 hours, prepare a major use permit submittal with the required findings (§ 31.03(c)) .
If the property is in a combining overlay (e.g., F, H, FP), confirm any overlay‑specific limitations and whether a use permit is required (see overlay articles and the district text) .
If the sign involves painting a mural or applied graphics to a masonry wall, obtain advance approval where required (see § 31.04(i)) .
Pay applicable fees and follow submittal requirements: plan elevations, site plan showing setbacks, and any supporting findings for discretionary approvals as required by the Planning Department and § 31.02 .

Risks & Ambiguities

Issue	Why it matters	What to verify
Conflicting construction sign text in the Article	The Article contains different numeric descriptions for construction/project signs (one clause lists 32 sq ft per side, 8 ft height; another clause references 50 sq ft per frontage and 10 ft height with renewals).	Verify which clause is effective for your permit with Planning staff (bring the property address, proposed sign dimensions, and cite § 31.03 language). If uncertain, treat the stricter limits as the working standard and request written clarification.
Painted murals vs. painted commercial identification	Paint on building façades may be treated as a prohibited painted sign unless approved as an artistic mural or as sole identification approved by the Planning Director (§ 31.04(i)).	Obtain written Planning Director confirmation (and a permit if a mural is treated as an exception). For historic buildings, also check Colusa Historic Preservation.
Stationary vehicle/trailer advertising	Signs on vehicles/trailers that remain stationary > 120 consecutive hours and are primarily for advertising may be allowed only by major use permit (§ 31.03(c)).	If you plan to use a vehicle or trailer for on‑site or long‑term advertising, prepare a major use permit submittal and evidence showing necessity and neighborhood compatibility.

Plain‑English summary

Colusa’s zoning code (Title 17, Article 31) lets small residential and temporary signs be installed without a permit if they meet the numeric limits (e.g., 2 sq ft name plaques, 6 sq ft for‑sale signs). Larger, illuminated, off‑site, or freeway‑oriented signs generally require a permit; particularly unusual signs (flashing signs, large billboards, or stationary vehicle advertising) need a major use permit and findings. Always confirm setbacks, frontage calculations, and overlay‑district limits with Planning before fabrication or installation — verify specifics for your parcel. See § 31.01–§ 31.05 for the controlling rules .

Source References

City of Colusa Zoning Code — Title 17 Zoning, Article 31 (Outdoor Advertising and Sign Regulations), § 31.01 – § 31.05 (purpose, permits, allowed sign types, prohibited signs, nonconforming signs) .
Colusa Zoning Code: detailed allowed sign types and temporary sign rules § 31.03(a) (residential, portable, temporary banners, construction signage) .
Major use permit exceptions and required findings for special signs § 31.03(c) (flashing signs, off‑site advertising, vehicle signs) .
Prohibited signs language including painted building exceptions § 31.04 (and § 31.04(i) re: painted signs/murals) .
Nonconforming sign removal/amortization rules § 31.05 .
District‑level sign condition for commercial building wall signs — C‑G district text (exterior sign projection/area limits) § 9.02(f) and related Article 31 cross‑references .
Cannabis business signage restriction § 21.5.08(a) (no exterior signs that evidence cannabis operations) .
Colusa Zoning — Title 17 introductory material (district list, plan) — Title page and Article listings, Title 17 Zoning .
For building‑code or structural permits related to sign mounting/attachments, consult the California Building Standards Code (state adoption and structural sign standards).

Sources

Retrieved passages

Colusa Zoning Code (section shall) High relevance
Colusa Zoning Code (section shall) High relevance
Colusa Zoning Code (§ 2) High relevance
Colusa Zoning Code (section shall) High relevance
California Building Code (Article 29.) Medium relevance
Colusa Zoning Code (article shall) Medium relevance
Colusa Zoning Code (section shall) Medium relevance
Colusa Zoning Code (§ 3) Medium relevance

Cited sections

Official Colusa code library

Frequently asked questions

How large can a home address plaque be in Colusa?

A residential name or address sign may be up to 2 square feet and is allowed without a sign permit — one per residence. See § 31.03(a)(1) for this allowance .

Do I need a permit for a business wall sign in Colusa?

Often yes. Many wall signs must comply with the numeric area limits in § 31.03 and the district text (for C‑G, exterior parallel signs must not exceed 50 sq ft and shall not project more than 2 ft) — check § 9.02(f) and § 31.02 for permit triggers and submission requirements .

What temporary signs are allowed for private events?

Private event signs: individual signs ≤ 6 sq ft, total ≤ 24 sq ft for a parcel; time‑limits apply (event signs must be taken down within days stated in § 31.03(a)(6–8)). See § 31.03(a)(6–8) for the time windows and rules .

Can I paint a mural that includes my business name on a commercial building?

Painted commercial signs on exterior walls are generally treated as prohibited unless they are approved as an artistic mural (major use permit) or the painted sign serves as the sole identification and is approved by the Planning Director — see § 31.04(i). Get written approval before painting .

What if I want an illuminated or flashing sign?

Illuminated or flashing signs (and moving images) are listed as the type of signs that may be allowed only with a major use permit and require specific findings (economic vitality, neighborhood character, consistency with the Article) — see § 31.03(c) for the list and required findings .

Are vehicle signs allowed if parked on my property?

Signs on vehicles, trailers, storage boxes, etc., that remain stationary for more than 120 consecutive hours and are primarily for advertising are treated as discretionary and require a major use permit (see the § that lists stationary vehicle advertising as an exception requiring the major use permit) — see § 31.03(c) .

What happens to an illegal or nonconforming sign?

Illegal signs must be removed within one year from the effective date of the ordinance; the nonconforming sign section describes timelines and required remedies — see § 31.05 for removal and amortization rules .

Does Colusa allow political/noncommercial messages on signs?

Yes. The code explicitly allows substitution of a noncommercial message on any authorized sign structure (message substitution language in the Article) — see § 31.01 for the policy that prevents favoring commercial over noncommercial speech .

Are there extra sign limits for cannabis businesses?

Yes. Cannabis businesses may not have exterior signage or markings that evidence cannabis operations; interior signs are allowed if they are not visible from outside. This is in the cannabis operations operational restrictions (§ 21.5.08(a)) and dispensary signage is reviewed with the cannabis special use permit .

Where can I confirm whether an overlay district changes signage rules for my parcel?

Check the combining district text that applies to your parcel (e.g., F, H, FP) and the zoning map; the combining district articles contain additional sign restrictions and use‑permit triggers — see the overlay language in the code and consult Planning (overlay examples referenced in Articles 23–25 and specific district articles) . ---

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