Local zoning · Irwindale

Irwindale — Signage

Q: How large can a freestanding sign be in an M‑2 zone?

Under the base M‑2 rules freestanding signs may be up to 150 sq ft gross sign face (§ 17.56.050(A) ). However, certain overlay provisions (for specific M‑2 overlays) may impose smaller limits (e.g., 12 ft tall and 50 sq ft in the M‑2 overlay at § 17.100.060(A) ), so apply the most restrictive rule.

Q: If I want a digital display on a billboard, what limits apply?

Digital billboard faces are permitted only under Chapter 17.72 conditions — conversions/replacements have strict buffer rules, require development agreements, have face-size and height caps and technical limits (e.g., image change interval not more often than every 8 seconds ) and detailed illumination/appearance controls in the development agreement (§ 17.72.050 ).

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

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Last reviewed: July 2, 2026

Overview

This page summarizes what the Irwindale Zoning Code (Title 17) and related chapters actually require for signs in Irwindale: who can put what kind of sign where, the numeric size/height limits that matter, prohibited sign types, submittal/plan requirements, and special rules for billboards and quarry-overlay parcels. Use this as a reference to interpret the code; always verify parcel-specific questions with the city. Key code provisions cited below are drawn from the Irwindale Zoning Code (Title 17) and the City's billboard chapter.

Note on related topics: sign approvals interact with site-level rules such as parking (/us/california/irwindale/parking), setbacks and development standards (/us/california/irwindale/development-standards), design review (/us/california/irwindale/design-review), overlay districts (/us/california/irwindale/overlay-districts), rules for ADUs (/us/california/irwindale/adu), and building-code construction and safety requirements in the California Building Standards Code (/us/california/building-codes). Linkage: when you prepare a sign submittal expect to reference those topics.

How the Irwindale code treats signs — district by district (practical breakdown)

Below are the code provisions that directly control signage for the most common zones. Each district subsection states the purpose, typical permitted sign types and the most decision-relevant numeric limits; all requirements are quoted as code citations (the governing § is shown) and the file search citation for that text is provided.

C-P (Commercial‑Professional)

Purpose / context: office and professional commercial uses that are lower intensity than general commercial; sign rules are specific to identity and leasing notices.
Typical permitted signs and limits:
- Nameplates up to 2 sq ft (§ 17.32.090(A))
- Identification signs: up to 50 sq ft per face, two allowed, or one sign up to 100 sq ft per face for permitted uses (§ 17.32.090(B))
- For-sale/lease signs: 12 sq ft per face (§ 17.32.090(C))

Practical note: C-P draws heavily on site plan submittal standards (see § 17.70.x) when projects require design/site review; a detailed sign plan is part of the site-plan package. (§ 17.70 — required information includes detailed sign plan)

C-1 and C-2 (Neighborhood and Heavy Commercial)

C-1 generally follows the C-P limits and uses; see § 17.36.010 and cross-reference to § 17.32 for limitations.
C-2 special sign rules:
- Signs that advertise goods/services on the premises allowed at 1 sq ft per 200 sq ft of lot area, but no single sign > 100 sq ft (§ 17.40.080(A))
- Marquees and signs may encroach up to 5 ft into the front setback (§ 17.40.060(A))

Practical note: calculate allowable sign area from lot area in C-2; if you need sign projection into a required yard, the code expressly allows limited encroachment for marquees/signs. (§ 17.40.060(A))

C-3 and C-M (Heavy commercial‑residential and Commercial‑Manufacturing)

C-3: same formula as C-2 — 1 sq ft per 200 sq ft of lot area and no individual sign > 100 sq ft; legally-established uses may have one extra sign not exceeding 50 sq ft (§ 17.44.080(A–B))
C-M follows many C-2/C-3 standards by cross-reference; check the chapter text for use-specific limits. (§ 17.48 cross-references C-2 standards)

M-1 (Light Manufacturing)

Freestanding signs: ≤ 150 sq ft gross sign face (§ 17.52.050(A))
Wall/building signs: maximum based on building area — 1 sq ft per 100 sq ft of gross floor area (§ 17.52.050(B))

M-2 (Heavy Manufacturing) and the M-2 overlay (automobile dismantling / recycling overlays)

Base M-2 rules:
- Freestanding signs: ≤ 150 sq ft gross face (§ 17.56.050(A))
- Building signs: 1 sq ft per 100 sq ft of gross floor area (§ 17.56.050(B))
Special M-2 overlay (Chapter 17.100 — overlay regulations for specific uses)
- For the overlay’s permitted operations, freestanding signs ≤ 12 ft tall and ≤ 50 sq ft (§ 17.100.060(A)) and building/wall signs ≤ 30 sq ft (§ 17.100.060(B))
- Prohibitions in the overlay: A-frames, banners, painted-on signs, animated/flashing signs (§ 17.100.060(C))
- Sign permit submittal requirements (site plan, construction/attachment/footing details, landlord approval) are explicit for overlay permits (§ 17.100.060(D))

Practical note: overlay rules can be stricter than base-zone rules — always apply the most restrictive sign rule that governs a parcel. The overlay explicitly limits portable and attention-getting signs. (§ 17.100.060; § 17.56.050).

Q — Quarry overlay zone

All signs on parcels in the Q overlay must comply with the general zoning code, with some overlay-specific guidance allowing signs within front-yard accessory allowances but otherwise deferring to Title 17 (§ 17.60.100 and § 17.60.080(B)(3–4))

Billboards (Chapter 17.72 — separate billboard regime)

Off-site commercial advertising (billboards) is regulated by Chapter 17.72; major points:
- Billboards are limited geographically: only adjacent to I‑605 and I‑210 in commercial, quarry, or industrial zones; not in public rights-of-way (§ 17.72.050.D.1–2).
- Sign face ≤ 675 sq ft, structure height ≤ 65 ft, max poles = 2, noncombustible structure design (§ 17.72.050.A–C).
- Buffer rules: new billboards not within 2,500 ft of another billboard on same side of ROW; replacements and digital-conversion buffers have narrower, complex rules (existing replacement prohibited unless outside 500 ft buffer; development agreements may reduce some buffers but not below 1,500 ft in some cases) (§ 17.72.050.D–G).
- Animated/moving/flashing/inflatable signs are generally prohibited on billboards; digital displays are allowed only under strict development-agreement standards and with limits on message change interval (images may not change more often than every 8 seconds) (§ 17.72.050.E–F; § 17.72.030).
- New static or digital billboards or conversions require a development agreement approved by the city (§ 17.72.030(B))

Practical note: billboard proposals are treated like major corridor infrastructure — expect development agreements, design standards, landscape mitigation and close coordination with CalTrans approvals. (§ 17.72.030 — .050/ .040)

Quick reference table — most decision-relevant sign standards

Zone / Sign type	Key limits (practical)	Code Reference
C-P (identification/sales)	Nameplate ≤ 2 sq ft; ID signs ≤ 50 sq ft each (or 1 × 100 sq ft) ; lease/sale sign ≤ 12 sq ft (§ 17.32.090)	§ 17.32.090
C-2 / C-3 (onsite ads)	1 sq ft per 200 sq ft lot area; no single sign > 100 sq ft; marquee/sign encroachment ≤ 5 ft into front yard (§ 17.40.080; 17.40.060; 17.44.080)	§§ 17.40.080, 17.40.060, 17.44.080
M-1	Freestanding ≤ 150 sq ft; building signs 1 sq ft per 100 sq ft Bldg. (§ 17.52.050)	§ 17.52.050
M-2	Freestanding ≤ 150 sq ft (base § 17.56.050) ; overlay: freestanding ≤ 12 ft tall & ≤ 50 sq ft; building/wall ≤ 30 sq ft; A-frames, banners, painted-on, animated/flashing prohibited (§ 17.56.050; 17.100.060)	§§ 17.56.050, 17.100.060
Q overlay	Signs must comply with Title 17; overlay grants accessory sign allowance in certain front‑setback accessory locations (§ 17.60.100; 17.60.080(B)(3–4))	§§ 17.60.100, 17.60.080
Billboards	Face ≤ 675 sq ft; height ≤ 65 ft; location limited to I‑605/I‑210 corridors; buffers between billboards; digital conversions restricted; dev. agreement required for new/converted billboards (§ 17.72.050 and 17.72.030)	Chap. 17.72 (§§ 17.72.030, 17.72.050)

Submittal, entitlements and review — what the code requires

Sign permit and site/plan review connection:
- Many sign allowances are “accessory” (i.e., allowed as part of a use) but still require a sign permit or are subject to site-plan/design-review. The city’s site-plan / design-review submittal checklist explicitly requires a detailed sign plan (location, dimensions, materials, lighting, mounting) as part of the package. (§ 17.70 — required info including sign plan)
Building-code and safety:
- Structural, electric, and construction rules for signs are governed by the building official and the California building code; building permits will not be issued unless the work complies with building-code requirements (§ 17.70.080(D)) and Appendix H of the California Building Standards Code addresses sign construction, loads, and mounting. (§ 17.70.080; Cal. Bldg. Code Appendix H)
Billboards require development agreements or other negotiated entitlements; the billboard chapter sets specific standards that override general provisions where applicable (§ 17.72.030, § 17.72.050)

Checklist — what an applicant must satisfy before the city will approve a sign permit or a sign-related entitlement

Confirm the parcel’s zoning and any overlay designations (R-1/R-2/R-3/A-1/C-P/C-1/C-2/C-3/C-M/M-1/M-2/Q) — zoning list: § 17.12.010.
Check the zone-specific sign limits (area, height, wall vs freestanding) — see applicable zone sections (examples: § 17.32.090, § 17.40.080, § 17.56.050, § 17.100.060).
For billboards or off-site advertising, confirm corridor eligibility (I‑605/I‑210) and prepare a development-agreement application — Chapter 17.72 (§ 17.72.030).
Prepare a sign plan with location, dimensions, area, height, materials, lighting and mounting details — required in site-plan packages (§ 17.70 submittal requirements).
If in an overlay (e.g., Q or any special overlay), confirm overlay-specific limits (some overlays are stricter) — e.g., § 17.60.100 and § 17.100.060.
Verify no prohibited sign types apply to your zone or use (many zones and the overlay expressly ban A-frames, banners, painted-on signs, animated/flashing displays) — see §§ 17.100.060(C) and billboard prohibitions in 17.72.050(E).
Coordinate building/structural/electrical approval with the building official; comply with the California Building Standards Code where construction/illumination/structural design applies. (§ 17.70.080(D); Cal. Bldg. Code Appendix H)

Risks & Ambiguities

Issue	Why it matters	What to verify
Overlay vs base-zone conflict	Overlay chapters (e.g., 17.100 overlay, 17.60 Q) may be more restrictive than base-zone sign rules; applying the wrong standard can lead to denial or enforcement action	Confirm which ordinance text controls the parcel (apply the more restrictive rule). Check § 17.100.060 and § 17.60.100.
Billboards and digital conversions	Billboards are governed by a separate chapter and often require development agreements, special buffers, and CalTrans approvals; digital displays face explicit timing/illumination limits	Early coordination required; review Chapter 17.72 (development agreement requirement, face area, height, buffer rules, image-change interval).
Where numeric limits come from (lot area vs. building area)	Some zones calculate allowed sign area from lot area (C-2/C-3) while others use building area (M-1/M-2) — miscalculation can produce an oversize sign	Confirm whether the limit cites lot area (§ 17.40.080) or building/gross floor area (§ 17.52.050, § 17.56.050).
Temporary/portable signs (A-frames, banners)	Several zones and the M-2 overlay expressly prohibit A-frames and banners; portable sign rules may be handled separately	If you plan to use temporary signage, verify local prohibitions: § 17.100.060(C) bans A-frames and banners in that overlay; billboard chapter prohibits inflatables/flashing for billboards (§ 17.72.050(E)).
Sign permit vs building permit	Sign permits and building permits are different processes; structural/electrical aspects must comply with building code and may require separate submittals	Provide a sign permit application and, where structural/electrical work is involved, obtain the building permit; see § 17.70.080 and Cal. Bldg. Code Appendix H.

Plain‑English summary

Irwindale’s zoning code sets zone-specific sign area and height limits (for example, C‑2 uses a lot-area formula and caps individual signs at 100 sq ft (§ 17.40.080), while many manufacturing zones allow 150 sq ft freestanding signs (§ 17.56.050)). The heavy-manufacturing overlay and the quarry overlay often impose stricter limits (for example the M‑2 overlay limits freestanding signs to 12 ft tall and 50 sq ft and forbids A-frames, banners and flashing signs — § 17.100.060). Off-site billboards are separately regulated and generally require a development agreement plus large buffers and construction/illumination standards (Chapter 17.72). Always submit a detailed sign plan with your site plan; structural/electrical work must meet the California building code.

Source References

Irwindale Zoning Code — Chapter authorizations and zone list: § 17.12.010.
C-P signs: § 17.32.090 (nameplates / identification / lease signs).
C-2 signs and encroachment rule for marquees/signs: § 17.40.060(A) and § 17.40.080.
C-3 signs: § 17.44.080.
M-1 signs: § 17.52.050.
General M-zone limits and recycling facility sign limits: § 17.56.050 and § 17.56.080 / 17.56.090.
M-2 overlay (overlay signage, prohibitions, submittal requirements): § 17.100.060.
Quarry overlay sign direction: § 17.60.100 and overlay accessory allowances: § 17.60.080(B)(3–4).
Billboards (Chapter 17.72): requirements on face area, height, buffers, digital display rules and development‑agreement requirement: § 17.72.010 — .050 (see especially § 17.72.030 and § 17.72.050).
Site-plan / design-review submittal requirements including a detailed sign plan: § 17.70 (required information / findings and review standards / building permit prerequisites § 17.70.080).
California Building Standards code (relevant sign construction and safety standards — Appendix H): California Building Code Appendix H (see sign definitions, construction, loads and mounting).

Sources

Retrieved passages

CBC § 2 (§ 2) High relevance
Irwindale Zoning Code (§ 1) High relevance
Irwindale Zoning Code Medium relevance
Irwindale Zoning Code (section or) Medium relevance
Irwindale Zoning Code (Section 17.70.070) Medium relevance
Irwindale Zoning Code (§ 1) Medium relevance
Irwindale Zoning Code (Section through) Medium relevance
Irwindale Zoning Code (Chapter 17.12) Medium relevance
Irwindale Zoning Code (§ 4) High relevance
Irwindale Zoning Code High relevance
Irwindale Zoning Code (Chapter 17.72) High relevance
Irwindale Zoning Code (chapter are) Medium relevance
Irwindale Zoning Code (Chapter 17.56) Medium relevance
Irwindale Zoning Code (§ 1) Medium relevance
Irwindale Zoning Code (§ 4) Medium relevance
CBC § 2 (Chapter 12.04) Medium relevance
Irwindale Zoning Code (§ 2) Medium relevance

Cited sections

Official Irwindale code library

Frequently asked questions

What counts as a sign under Irwindale's zoning code?

A "sign" is treated per the zoning definitions and includes wall signs, freestanding signs, billboards, projecting/marquee signs and digital faces. The code uses zone-specific allowances; see the definitions in the code and the zone sign articles for numeric limits (example definitions and sign construction references are in Chapter 17 and Appendix H of the California Building Code) — see § 17.08.445 and Appendix H references.

How large can a freestanding sign be in an M‑2 zone?

Under the base M‑2 rules freestanding signs may be up to 150 sq ft gross sign face (§ 17.56.050(A)). However, certain overlay provisions (for specific M‑2 overlays) may impose smaller limits (e.g., 12 ft tall and 50 sq ft in the M‑2 overlay at § 17.100.060(A)), so apply the most restrictive rule.

Can I put an A‑frame or banner on my commercial parcel in Irwindale?

Check the specific zone first. Some areas and overlays explicitly prohibit A‑frames and banners (for example the M‑2 overlay prohibits A‑frames and banners — § 17.100.060(C)). Billboards and other corridors have their own prohibitions (Chapter 17.72). Where the code does not expressly prohibit a temporary sign, other local rules or permit conditions may apply; verify with the planning department.

What do I need to include with a sign permit application?

A sign application tied to site-plan or design-review submittal must include a site plan and detailed sign plan showing dimensions, materials, mounting/footings and lighting, and landlord/property-owner approval where applicable (§ 17.70 and § 17.100.060(D)). If structural/electrical work is required, a building permit submittal per the California Building Standards Code (Appendix H and relevant chapters) will also be needed.

Do billboards require a special process in Irwindale?

Yes. Billboards (off‑site outdoor advertising) are governed by Chapter 17.72; new static/digital billboards or conversions generally require a development agreement, are geographically limited to corridors adjacent to I‑605 and I‑210, and must meet size, height, buffer and landscaping standards (see § 17.72.030, § 17.72.050).

Can a sign be in the public right‑of‑way?

The zoning code expressly prohibits signs in the public right‑of‑way in multiple places (for example § 17.100.060(E) for the M‑2 overlay and the billboard chapter prohibits structures in the right‑of‑way). Always confirm clearance with Public Works for any encroachment. (§ 17.100.060(E); Chapter 17.72)

If I want a digital display on a billboard, what limits apply?

Digital billboard faces are permitted only under Chapter 17.72 conditions — conversions/replacements have strict buffer rules, require development agreements, have face-size and height caps and technical limits (e.g., image change interval not more often than every 8 seconds) and detailed illumination/appearance controls in the development agreement (§ 17.72.050).

Does the quarry (Q) overlay change signage rules?

Parcels in the Q overlay must comply with Title 17 generally, but the overlay adds its own front-yard accessory allowances and states that signs in the Q overlay "shall comply with the provisions of this zoning code" and lists when signs may be located in front‑setback accessory areas (§ 17.60.100; 17.60.080(B)). Verify both the overlay and the underlying zone.

What if my existing sign doesn't meet current code?

Irwindale treats nonconforming signs under the nonconforming uses chapter and specific amortization rules where relevant. For billboards, the chapter contains provisions about legal nonconforming signs and when replacement is allowed; other illegal signs must be removed (§ 17.72.030, Chapter 17.76). Verify nonconforming status with planning.

Who enforces sign maintenance and visual-compatibility standards?

The city manager or their designee has authority to review sign appearance and maintenance for safety and compatibility (see billboard appearance/maintenance standards), and violations can be abated as nuisances per the code (§ 17.72.050(F); § 17.66.060 for nuisances/enforcement).

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