Costa Mesa — Signage

Last reviewed: July 1, 2026

Overview

This page summarizes what the City of Costa Mesa’s Zoning Code says specifically about signage — where signs are allowed, size/height limits, prohibited sign types, permit triggers, and enforcement. The rules are in the City’s Planning, Zoning and Development Code (Title 13). Key sign provisions and the master sign table are found in § 13-112, § 13-113, § 13-114, and § 13-115.

Note: this page covers only the local zoning/planning rules about signs (Title 13). Structural, electrical or accessibility requirements for signs come from the California Building Standards Code and are outside the scope of this summary.

How the code is organized (short)

• General sign prohibitions and definitions: § 13-112 and § 13-6.
• General permitting and applicability: § 13-113, § 13-114, and § 13-115 (Table 13-115 is the primary sign standards table).
• Temporary / public property signs: § 13-118.1 and § 13-118.2.
• Portable signs in the public right-of-way (detailed rules): § 13-123.5 (and companion provisions in § 13-123).
• Enforcement and penalties: § 13-128.

I link other related development topics when they naturally appear below (for example, parking, development standards, design review, overlays and variances) so you can cross-reference how signs interact with other requirements: Costa Mesa Parking, Costa Mesa Development Standards, Costa Mesa Design Review, Costa Mesa Overlay Districts, Costa Mesa Variances and Exceptions, Costa Mesa Landscaping and Screening.

District-by-district breakdown (how the sign rules differ by zone)

The Zoning Code organizes districts into the standard city groups; the district labels used across the City are listed in § 13-30 (e.g., R1, R2‑MD, R2‑HD, R3, AP, CL, C1, C2, C1‑S, TC, MG, MP, and institutional zones I & R, I & R‑S, I & R‑MLT) — those names are the ones you must use on applications.

Below I summarize sign-purpose, typical allowed sign types and the most relevant dimensional rules pulled from Table 13-115 and associated text (§ 13-115, and related subsections). Where a table cell applies to multiple base districts I show the group name (Residential, Commercial, Industrial, Institutional) and reference the district list in § 13-30.

Residential zones — R1, R2‑MD, R2‑HD, R3

Purpose and typical uses

• Primarily single‑ and multi‑family housing; small residential common‑interest developments; accessory uses. See § 13-30 for the district list.

Sign rules (high‑priority points)

• Total sign area per street frontage for residential uses is 1.0 sq. ft. per dwelling unit, not to exceed 90 sq. ft. (minimum 25 sq. ft. for sites with ≥4 units). § 13-115 / Table 13-115.
• Freestanding (ground) signs: max 30 sq. ft. area, 7 ft. max height; must sit in landscaped planter equal to twice the sign area and not obstruct visibility. § 13-115 / Table 13-115.
• Real estate / open house / for-sale signs: small, limited — for single-family typical maxs are 5 sq. ft. / 6 ft height and 3 sq. ft. / 5 ft height for open house signs; check Table 13-115 for specifics. § 13-115.

Where this applies

• Any property zoned R1, R2‑MD, R2‑HD, R3; see the Land Use Matrix and Table 13‑115 for per-site calculations.

Commercial zones — AP, CL, C1, C2, C1‑S, TC

Purpose and typical uses

• Retail, office, auto‑service, mixed commercial activity (see § 13-30 Land Use Matrix).

Sign rules (high‑priority points)

• Total sign area per street frontage: Table 13-115 provides formulas/limits that depend on site area and frontage (see Table 13‑115). § 13-115 / Table 13-115.
• Building wall signs: single‑tenant buildings typically allowed 1.5 sq. ft. per lineal foot of building frontage (special cap if frontage < 25 ft). Multi‑tenant rules limit number of wall signs per frontage (one/two/three depending on size) — see § 13-115.
• Freestanding signs: non‑residential freestanding signs often limited to 12 ft. height and area tied to the total allowed sign area; freeway‑oriented freestanding signs are allowed for qualifying commercial sites of ≥1 acre within 300 ft. of an exit (subject to a large max such as 230 sq. ft. and 32 ft. height in the code language). § 13-115 / Table 13-115.
• Window signs: temporary window signs = 20% of contiguous window area; total permanent + temporary window signage cannot exceed 50% contiguous window area; temporary limit typically 60 days without a permit. § 13-115 / Table 13-115.

Special notes

• Planned Signing Program: the C1‑S zone requires a planned signing program (see development standards references / Table 13‑44). This is a required alternative to the general sign rules in that zone. § 13-28 and Table 13‑44 reference this.

Where this applies

• All listed commercial zones; for projects inside an urban plan / mixed‑use overlay double‑check the overlay rules as they may modify sign standards. See Costa Mesa Overlay Districts.

Industrial zones — MG, MP

Purpose and typical uses

• Manufacturing, warehouse, light industrial uses; signs intended for identification and wayfinding. See § 13-30.

Sign rules (high‑priority points)

• Freestanding signs: industrial zones allow modest freestanding signs (e.g., 15 sq. ft. max listed in Table 13‑115 for some institutional/industrial rows) — consult Table 13‑115 for exact per-site allowances. § 13-115 / Table 13-115.
• Illumination: exterior or interior with opaque background allowed — no flashing/blinking lighting anywhere. § 13-112 and § 13-115.

Where this applies

• MG and MP sites as listed in Table 13‑30 and Table 13‑115.

Institutional / Recreational zones — I & R, I & R‑S, I & R‑MLT

Purpose and typical uses

• Public facilities, parks, schools, hospitals; signage usually oriented to identification of public uses and wayfinding.

Sign rules (high‑priority points)

• Table 13‑115 contains specific rows for Institutional Zones (permitted freestanding and building signs, often with lower height/area limits and additional review requirements). § 13-115 / Table 13-115.
• Temporary banners and signs on public property (city-owned fields, parks) are separately regulated under § 13-118.1 and § 13-118.2.

Where this applies

• Public parcels and facilities; for banners on city baseball/softball fields see § 13-118.2.

Quick reference table — most decision‑relevant standards

(For the complete matrix and all numeric cells consult Table 13‑115 in the Zoning Code; the table contains the full per-zone breakdown.)

Practical guidance / interpretation (plain-English, actionable)

• If your project is in a commercial zone and you need a new wall sign or freestanding sign, start with Table 13‑115 and confirm the total sign area per street frontage for your site; that numeric cap controls most other allowances (building wall area, freestanding allowances). See § 13-115.
• Portable/sandwich‑board style displays in the public right‑of‑way are tightly regulated: the city allows commercial portable signs in designated landscaped parkways under precise size (≤5 sq. ft.) and placement rules and limited days/hours (§ 13-123.5). Don’t assume sidewalks or medians are available; the code forbids signs in certain locations like medians and within 15 ft. of hydrants/driveways.
• Murals or large "super graphics" are treated as signs only when they advertise a product/service; in many circumstances a mural permit or review is required — check the mural/super‑graphic note in Table 13‑115 and the painted‑wall / mural provisions. Permit review is frequently discretionary.
• If your site is inside a specific plan, mixed‑use overlay or the C1‑S zone, additional or alternative sign rules (like a required planned signing program) may apply — review the overlay/specific plan text and the planned signing program requirement. See Costa Mesa Overlay Districts and § 13‑28 / Table 13‑44.

Checklist — what an applicant must satisfy before sign installation

• Verify zoning district for the parcel (e.g., C1, CL, R1) per the Land Use Matrix § 13-30.
• Confirm total allowable sign area per street frontage for the site from Table 13‑115 (start with § 13-115).
• Determine whether the proposed sign type needs a permit (§ 13-114) — permits are required for many permanent and temporary signs.
• For signs projecting into a right‑of‑way or portable signs in the ROW, confirm compliance with § 13-123 / § 13-123.5 placement, size and time limits.
• Ensure the design does not include prohibited features (flashing, inflatable >24", pennants, material that mimics traffic signs): § 13-112.
• If illumination is planned, confirm illumination type (interior with opaque background or exterior) and no flashing/blinking: § 13-112 and § 13-115.
• If the site is in C1‑S or an overlay, prepare a planned signing program if required (see § 13‑28 and Table 13‑44).
• Coordinate sign location and landscaping to meet freestanding sign planter requirements and sight‑distance rules (see Table 13‑115 and Costa Mesa Landscaping and Screening).
• Submit sign permit application and pay fees per administrative rules referenced in § 13‑114 and the Administration articles.

Risks & Ambiguities

Plain-English Summary

Costa Mesa’s zoning rules limit the size, number, and type of signs by zoning group (residential, commercial, industrial, institutional). Major rules and numeric caps are in Table 13‑115 and you usually need a sign permit for anything other than sign maintenance or small temporary window/real‑estate signs; portable signs in the public right‑of‑way and banners on city property have their own special rules. Start by checking § 13‑115 and the portable sign rules in § 13‑123.5.

Information Gaps

• Exact complete numeric formula for total sign area per street frontage for all commercial/industrial table cells is partially truncated in the retrieved excerpts — see Table 13‑115 directly for full cells. Not all table cells were fully extracted from the provided file. Verify the full Table 13‑115 in the official code.
• Application fee schedule, submittal checklist specifics and processing times for sign permits: Not found in retrieved materials (check City fee resolution/Development Services).
• Whether temporary event banner exceptions exist beyond those in § 13‑118.1/118.2 for specific city programs: partial details provided; verify with Recreation Manager.

Source References

• Costa Mesa Zoning Code, Article 3 (Sign Regulations): § 13‑113, § 13‑114, § 13‑115 (Table 13‑115).
• Costa Mesa Zoning Code, Prohibited signs and definitions: § 13‑112, § 13‑6 (definitions including “sign”, “freestanding sign”, “permanent window sign”, “nonconforming sign”).
• Costa Mesa Zoning Code, Temporary signs on public property and banners on baseball/softball fields: § 13‑118.1, § 13‑118.2.
• Costa Mesa Zoning Code, Commercial portable signs within public right‑of‑way: § 13‑123.5 (size, location, time window, owner identification, exceptions).
• Costa Mesa Zoning Code, Enforcement (illegal signs, removal, costs): § 13‑128.
• Zoning district list and Land Use Matrix: § 13‑30 (district names such as R1, C1, MG, etc.).
• California Building Standards Code (for building/electrical/accessibility requirements that apply after zoning sign approval): 2025 CBC excerpts.

Retrieved passages

• Costa Mesa Zoning Code High relevance show source text
• Costa Mesa Zoning Code (section 13-123) High relevance show source text
• Costa Mesa Zoning Code High relevance show source text
• Costa Mesa Zoning Code (section 13-123) High relevance show source text
• Costa Mesa Zoning Code (section shall) High relevance show source text
• Costa Mesa Zoning Code Medium relevance show source text
• Costa Mesa Zoning Code Medium relevance show source text
• Costa Mesa Zoning Code (§ 2) Medium relevance show source text
• CEC § 2 (Chapter II) High relevance show source text
• Costa Mesa Zoning Code High relevance show source text
• Costa Mesa Zoning Code High relevance show source text
• Costa Mesa Zoning Code (§ 2) Medium relevance show source text
• Costa Mesa Zoning Code (Chapter XV) Medium relevance show source text
• Costa Mesa Zoning Code (§ 2) Medium relevance show source text

Cited sections

• Costa Mesa Zoning Code, Article 3 (Sign Regulations): **§ 13‑113**, **§ 13‑114**, **§ 13‑115** (Table 13‑115). (Article 3)
• Costa Mesa Zoning Code, Prohibited signs and definitions: **§ 13‑112**, **§ 13‑6** (definitions including “sign”, “freestanding sign”, “permanent window sign”, “nonconforming sign”). (§ 13)
• Costa Mesa Zoning Code, Temporary signs on public property and banners on baseball/softball fields: **§ 13‑118.1**, **§ 13‑118.2**. (§ 13)
• Costa Mesa Zoning Code, Commercial portable signs within public right‑of‑way: **§ 13‑123.5** (size, location, time window, owner identification, exceptions). (§ 13)
• Costa Mesa Zoning Code, Enforcement (illegal signs, removal, costs): **§ 13‑128**. (§ 13)
• Zoning district list and Land Use Matrix: **§ 13‑30** (district names such as **R1**, **C1**, **MG**, etc.). (§ 13)
• California Building Standards Code (for building/electrical/accessibility requirements that apply after zoning sign approval): 2025 CBC excerpts.
• CostaMesa_ZoningCode.md
• 2025 California Building Code.md

• Official Costa Mesa code library