Local zoning · Union City

Union City — Signage

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

Ask a question free See coverage

Last reviewed: July 2, 2026

Overview

This page summarizes Union City’s local sign regulations as codified in Title 18 (Chapter 18.30 — Sign Regulations). It explains key definitions, what signs are exempt or prohibited, how total permitted sign area and height are computed, and the review procedures and district‑specific limits you must follow when planning signs in Union City. The legal text controlling signs is Chapter 18.30 (range § 18.30.010 – § 18.30.110) of the Union City Zoning Code; details referenced below identify the exact sections to verify.

Note: this page stays inside the zoning/planning/signage rules (Title 18). For building code (Title 24) or electrical permits, consult the California Building Standards Code. [/us/california/building-codes]

How the Sign rules fit into other local rules

  • Sign design and placement must be consistent with the city's sign plan and site review procedures in Chapter 18.76; signage is also tied into district rules in Chapter 18.36 (commercial) and other district chapters.
  • Signs interact with off‑street parking rules and driveway sight‑lines; check the city's parking rules before finalizing freestanding sign placement. [/us/california/union-city/parking]
  • When design guidance or review is needed, the city's design‑review and site development procedures apply. [/us/california/union-city/design-review]

Key legal points (plain-English, ordinance citations)

  • Purpose and scope: Chapter 18.30 sets the purposes (effective communication, aesthetics, safety, enforceable review process) and covers definitions, computation rules, exemptions, prohibitions, district standards, design criteria, and review procedures. See § 18.30.010 – § 18.30.110.

  • Exempt signs: A set of small, temporary, or governmental signs are exempt from sign‑plan procedures (for example, official notices, certain directional/regulatory signs, interior mall signs, holiday decorations, limited real‑estate signs, open house signs, flags, temporary political signs subject to rules). These are listed as exempt under § 18.30.040 (exemptions) and discussed in the chapter text.

  • Prohibited signs: The code explicitly prohibits moving/animated/flashing signs, pennants (wind signs), roof signs, most portable signs (with limited exceptions), traffic‑hazardous signs, signs on public property (with limited exceptions), billboards/off‑premises signs (except as allowed by specific subsections), multi‑tenant freestanding signs with more than two tenant names (unless a use permit for a planned sign program is approved), window signs over 25% of the window, and abandoned signs. See § 18.30.050 (prohibitions).

  • Computation (area & height): The code defines sign area and provides specific measurement rules for multi‑faced signs and freestanding sign height. The maximum total permitted sign area for a lot or tenant is computed using the formula in § 18.30.080; freestanding sign height is measured from normal grade to the top of the sign (with limited carve‑outs for non‑text design elements). See the definitions and computation rules inside Chapter 18.30.

  • District controls and design criteria: General design criteria and district regulations (including additional limits for commercial, industrial, and freeway‑oriented signs) appear in subsections of Chapter 18.30 and are cross‑referenced from district chapters (for example, commercial districts are governed by Chapter 18.36 and the sign area formulas in § 18.30.080).

  • Review & approvals: Unless exempt under § 18.30.040, sign plan approval is required prior to erection/placement/modification. Sign plans must contain a plot plan, elevations, sign dimensions, computation of total sign area, lighting and material specifications, etc. Routine sign plan review is administered by the Economic & Community Development Department (Director); some applications (proposed developments or freeway signs) require site development review under Chapter 18.76. See § 18.30.100 for procedures.

  • Freestanding freeway‑oriented signs: Special rules apply (minimum/maximum distance from freeway, one sign per lot, height cap, sign area formula up to a maximum, design criteria that preclude pole signs). See § 18.30.090.

District‑by‑district breakdown

Note: the code ties sign standards to zoning districts defined in other chapters (for example Chapter 18.12 and Chapter 18.36). For each district below I cite the controlling sign rules in Chapter 18.30 and point to the district chapter where the district is defined.

Residential districts (examples: R-5000, RS-6000, RM‑1500)

  • Purpose / typical uses: single‑family and multifamily residential uses (see Chapter 18.32 for permitted uses). Sign rules for residential lots are restrictive: only small, incidental signs are generally allowed without a sign plan.
  • Key dimensional / content limits: real estate signs for a single residential parcel (max 7 sq ft) and home‑occupation signs (max 1.5 sq ft) are specifically permitted as exemptions; window signs are limited to 25% of window area. Larger or non‑exempt signs require sign plan approval. See § 18.30.040 and § 18.30.050.
  • Where it applies: All single‑family and multi‑family residential districts; cross‑refer Chapter 18.32. Verify exact R‑zone name on the parcel. [/us/california/union-city]

Commercial districts (examples: CSMU, CPA, CN, CC, CMU, CUL, CMU, MMU, SEE)

  • Purpose / typical uses: office, retail, visitor services and mixed‑use commercial activities (see Chapter 18.36 for the list).
  • Key dimensional standards (decision‑relevant):
    • Building sign area is tied to lineal feet of building/tenant frontage with a lookup by setback (example: setbacks 0–50 ft = 1.00 sq ft per lineal foot; 51–130 ft = 1.25; 131–250 ft = 1.45; 251+ ft = 1.80). See § 18.30.080 and the commercial subsection in Chapter 18.30.
    • Freestanding signs in commercial districts: typical maximum area 64 sq ft, maximum height 6 ft (and limited to sign area for up to two tenants unless a planned sign program is approved). See § 18.30.080.
  • Where it applies: all C (commercial) zoning districts as listed in Chapter 18.36; project sign plans must conform to design criteria in § 18.30.070 and area rules in § 18.30.080. [/us/california/union-city/zoning]

Industrial districts (examples: ML, MG, MS, RDC)

  • Purpose / typical uses: light and general industrial activities and associated services (see Chapter 18.12 for district definitions).
  • Key standards:
    • Building signs: in ML/MG, maximum of 0.25 sq ft per lineal foot of building/tenant frontage (capped at 200 sq ft in ML/MG). In MS and RDC the max may be 0.5 sq ft per lineal foot.
    • Freestanding signs: typical maximum sign area 64 sq ft and maximum height 6 ft in industrial districts; may identify up to two businesses unless a planned program is approved. Freestanding signs must display street addresses and have contrasting background.
  • Where it applies: industrial zoning districts defined in Chapter 18.12; special screening and compatibility standards may apply in project review. Verify frontage measurements used for computing allowable area.

Station‑area and mixed‑use districts (examples: SEE — Station East Employment; CMUE — Corridor Mixed‑Use Employment)

  • Purpose / typical uses: employment, mixed‑use, transit‑oriented development. Signage must be designed as integral to building architecture and pedestrian‑oriented features (blade signs encouraged). Blade signs projecting over sidewalks require an encroachment permit from Public Works. See Chapter 18.41 and cross‑references to Chapter 18.30. [/us/california/union-city/overlay-districts]
  • Key limits: sign plans required with development; follow building‑sign area formulas in § 18.30.080 and design criteria in § 18.30.070; blade/awning signs are specifically mentioned as allowed subject to encroachment permissions.

Civic Center Design Control District (CCDCD)

  • Purpose: high‑quality urban design standards around the Civic Center; all district regulations apply with additional design requirements. Signs in CCDCD must comply with the sign plan and design criteria and are evaluated under the CCDCD rules in addition to Chapter 18.30. See the CCDCD chapter and § 18.30.100 for sign plan integration into site development review.

Private Institutional (PI) and other special districts

  • Signs for institutions (schools, churches, etc.) are regulated by Chapter 18.51 but still subject to Chapter 18.30; typical institutional signage that exceeds normal district allowances will require a sign plan and may be reviewed under site development procedures.

Quick reference table — common numeric limits

Type of sign / topic Typical limit Where set / Code reference
Building sign area (commercial, by setback) 0–50 ft: 1.00 sq ft per lineal ft; 51–130 ft: 1.25; 131–250 ft: 1.45; 251+ ft: 1.80 § 18.30.080; commercial subsection
Freestanding sign (commercial/industrial) 64 sq ft max; 6 ft max height (typical) § 18.30.080; commercial/industrial text
Window signs ≤ 25% of window area § 18.30.040 / prohibited list referencing limits
Real estate sign (single residential parcel) ≤ 7 sq ft Exempt list § 18.30.040
Freestanding freeway‑oriented signs Max 55 ft height; sign area up to 200 sq ft (0.40 sq ft per lineal ft setback; min 100 sq ft allowed) § 18.30.090 (freeway sign rules)
Multi‑tenant freestanding signs Max for two tenants; >2 tenant names requires a planned sign program/use permit § 18.30.080 & planned sign program rules § 18.30.100(E)

Checklist

  • Confirm whether the sign is exempt under § 18.30.040 (exempt signs) — if so, follow the exemption limits.
  • Measure tenant/building frontage and compute total permitted sign area per § 18.30.080.
  • Prepare a sign plan with plot plan, elevations, sign dimensions, lighting, materials, area calculations, and street address info as required by § 18.30.100.
  • Check district‑specific limits (commercial, industrial, station area) in the applicable district chapter (e.g., Chapter 18.36, Chapter 18.12, Chapter 18.41) and apply § 18.30.070/080 design criteria. [/us/california/union-city/development-standards]
  • For blade/awning signs projecting into the public right‑of‑way, secure an encroachment permit from Public Works.
  • If the proposed sign exceeds height/area limits, consider a variance (Chapter 18.60) or a planned sign program use permit (Planning Commission) per § 18.30.100(E).
  • Coordinate with parking and driveway sight‑line requirements when placing freestanding signs. [/us/california/union-city/parking]

Risks & Ambiguities

Issue Why it matters What to verify
Exempt vs. non‑exempt classification Exempt signs avoid full sign‑plan procedures; misclassification can result in removal/enforcement. Verify the exact exemption clause (for example residential real‑estate signs, political signs) in § 18.30.040.
Which district controls a parcel District determines applicable numeric limits and whether special overlays or CCDCD rules apply. Confirm the parcel's zoning designation on the city's zoning map and consult the district chapter (e.g., Chapter 18.36, 18.12). [/us/california/union-city/zoning]
How to measure frontage and sign area Frontage measurement affects allowable sign area; multi‑frontage buildings get area per frontage but per‑street caps apply. Apply the computation rules and frontage definitions in Chapter 18.30 and § 18.30.080.
Freestanding freeway sign formulas Freeway signs use a different area formula and strict setbacks/heights; miscalculations can cause denial. Confirm setback to freeway centerline and apply § 18.30.090 precisely.
Multi‑tenant sign rules Multi‑tenant freestanding signs are limited to two tenant names unless a planned sign program is approved. If you need >2 tenant names, pursue a planned sign program/use permit per § 18.30.100(E).
Interaction with public right‑of‑way Signs that project over sidewalks or are located near public property may need encroachment permits. Verify requirement for an encroachment permit with Public Works and review § 18.30 references to public property signs.

Plain‑English Summary

Union City’s sign rules live in Chapter 18.30 of Title 18; small residential signs and certain temporary or governmental signs are exempt, but most commercial and freestanding signs require a sign plan. The code sets formulas for allowable sign area tied to frontage, caps freestanding signs (typical commercial/industrial freestanding sign: 64 sq ft, 6 ft high), bans animated/flashing and many off‑premises signs, and requires plan review and sometimes site development review for larger sign programs. Always compute area using § 18.30.080 and submit a sign plan per § 18.30.100.

Source References

  • Chapter 18.30, SIGN REGULATIONS (range § 18.30.010 – § 18.30.110) — ordinance purpose, definitions, exemptions, prohibitions.
  • Exempt sign types and small residential sign rules — § 18.30.040 (exemptions).
  • Prohibited signs and limits (moving/animated, roof signs, portable signs, window limits, abandoned signs) — § 18.30.050.
  • Computation of sign area, sign area formula reference § 18.30.080, and definitions — computation and measurement rules.
  • Sign plan contents and review procedures — § 18.30.100 (sign plan, Director review, site development review triggers).
  • Freestanding freeway‑oriented sign rules — § 18.30.090 (location, height, area, design).
  • Industrial district sign limits (ML, MG, MS, RDC) — industrial subsection of Chapter 18.30.
  • Cross‑references to district chapters (commercial rules and where sign rules apply) — Chapter 18.36 and other district chapters referenced within Title 18.

External/internal pages (link to the city's GoCodebook menu pages mentioned earlier):

  • Union City zoning & planning overview: [/us/california/union-city]
  • Union City Zoning: [/us/california/union-city/zoning]
  • Union City Land Use: [/us/california/union-city/land-use]
  • Union City Development Standards: [/us/california/union-city/development-standards]
  • Union City Parking: [/us/california/union-city/parking]
  • Union City Design Review: [/us/california/union-city/design-review]
  • Union City Overlay Districts: [/us/california/union-city/overlay-districts]
  • Union City Historic Preservation: [/us/california/union-city/historic-preservation]
  • Union City Nonconforming Uses: [/us/california/union-city/nonconforming-uses]
  • Union City Variances and Exceptions: [/us/california/union-city/variances-and-exceptions]
  • Union City Landscaping and Screening: [/us/california/union-city/landscaping-and-screening]
  • Union City ADUs: [/us/california/union-city/adu]
  • California Building Standards Code (Title 24): [/us/california/building-codes]

Sources

Retrieved passages

  • CBC § 3 (§ 3) High relevance
  • Union City Zoning Code (§ 2) High relevance
  • CBC § 2 (§ 2) High relevance
  • Union City Zoning Code (Section 18.30.080) High relevance
  • Union City Zoning Code (Chapter 18.12) High relevance
  • Union City Zoning Code (§ 4) High relevance
  • Union City Zoning Code (Chapter 18.30.) Medium relevance
  • Union City Zoning Code (Chapter 7.13) Medium relevance
  • Union City Zoning Code (Chapter 18.30) High relevance
  • Union City Zoning Code (Section 18.30.060.) High relevance
  • Union City Zoning Code (Section 18.30.040) High relevance
  • Union City Zoning Code (Chapter 7.13) High relevance
  • Union City Zoning Code (Chapter 18.76.) High relevance
  • Union City Zoning Code (Section 18.30.070) High relevance

Cited sections

Frequently asked questions

What chapter of Union City's code controls signs?

The sign regulations are in Title 18, Chapter 18.30 (Sign Regulations, § 18.30.010 – § 18.30.110) of the Union City Zoning Code; that chapter contains purposes, definitions, exemptions, prohibitions, computation rules, district standards, and review procedures.

Which signs are exempt from the sign‑plan permit process?

A set of small or governmental signs are exempt under § 18.30.040 — examples include official notices, interior mall signs not visible from the public right‑of‑way, limited real‑estate signs (residential ≤ 7 sq ft), holiday decorations, certain political signs (with time limits), and flags. Verify the specific exemption criteria in § 18.30.040.

Are animated or digital changeable‑copy signs allowed in Union City?

No — animated, moving, flashing, or changeable copy signs are generally prohibited throughout the city unless specifically excluded by other subsections (the prohibition list is in § 18.30.050). Time/temperature signs, movie marquee signs, and gasoline price signs may be excepted where the chapter allows.

How do I compute permitted sign area for a storefront in Union City?

Total permitted sign area is computed per the formula in § 18.30.080 (apply the allowed square feet per lineal foot of building or tenant frontage, with values that vary by setback), and multi‑frontage buildings may be allowed area for each frontage but with per‑street caps; see the computation rules in Chapter 18.30.

What are the typical freestanding sign limits for commercial sites?

For many commercial districts the typical freestanding sign limit is 64 sq ft area and 6 ft height, each freestanding sign can serve up to two tenants unless a planned sign program is approved; check the commercial subsection of Chapter 18.30 for exact application to your district and frontage.

Do freeway‑oriented signs have special rules?

Yes. Freestanding freeway‑oriented signs have special location, setback, area, and height rules (minimum distance from freeway right‑of‑way, max 55 ft height, area computed as 0.40 sq ft per lineal foot of sign setback with minimum/maximum caps). They require site development review and the full sign‑plan application detailed in § 18.30.090 and § 18.30.100.

If my property is in the CCDCD or a design overlay, do I follow Chapter 18.30?

Yes. Signs inside the Civic Center Design Control District (CCDCD) and overlay districts must meet Chapter 18.30 rules plus the overlay's design standards; the CCDCD specifically requires sign details as part of the district review submittal. Verify overlay‑specific additions and any stricter rules.

Can a freestanding multi‑tenant sign list more than two businesses?

Not by right — multi‑tenant freestanding signs may provide area for up to two businesses. Listing more than two tenant names requires approval of a planned sign program (a use permit) under § 18.30.100(E).

Do blade signs need extra permits if they project over the sidewalk?

Yes — blade signs that project into the public right‑of‑way typically require an encroachment permit from Public Works in addition to sign‑plan approval; the SEE/station districts call this out specifically. [/us/california/union-city/overlay-districts]

Who approves sign plans and can I appeal a denial?

The Director (Economic & Community Development) handles administrative sign plan approvals; decisions may be appealed to the Planning Commission and then to City Council per the appeal procedures in Chapter 18.52. For major projects sign plans are reviewed under site development review (Chapter 18.76). See § 18.30.100 for process details. ---

More in Union City code

Ask about any Union City property

Get a cited, plain-English answer on Union City zoning, setbacks, FAR, ADUs and permits — for any address.

Start Free Trial

More Union City zoning topics

Union City Zoning

Union City Land Use

Union City Development Standards

Union City Parking

Union City Design Review

Union City Overlay Districts

Union City Historic Preservation

Union City Nonconforming Uses

Union City Variances and Exceptions

Union City Landscaping and Screening

Union City overview