Carson — Overlay Districts

Last reviewed: July 1, 2026

Overview

Overlay districts in Carson are special notations on the City's zoning map that add targeted rules or permissions on top of an underlying zone. They are created by CMC Title 9 (the Zoning Chapter) and used for site-specific policy (for example freeway signage, campus sites, design review areas, and mixed-use corridors). See the City’s mapping and the base Carson Zoning rules to locate overlays on a parcel; overlay rules interact with the City's development standards, parking, and design review procedures. The overlay program and the list of overlays are established at § 9113.2 of the Carson Municipal Code.

How this page is scoped

This page summarizes only what the Carson zoning/planning ordinance (Article/Chapter cited below) says about overlay districts — purpose, where the ordinance gives numeric or procedural standards, and what the code does not specify. For matters outside zoning (e.g., Title 24 building code technical rules), consult the California Building Standards Code.

Citywide list (what the code creates)

The ordinance explicitly creates the following overlay designations that may be shown on the Zoning Map and combined with any zoning district: BP – Blimp Port, CEM – Cemetery, COL – College, D – Design Overlay, EMS – Electronic Marquee Signage, MUR – Mixed-Use Residential, ORL – Organic Refuse Landfill, and MHP – Mobilehome Parks. These appear in § 9113.2.

Below is a district-by-district breakdown based on the Carson code text.

BP — Blimp Port

• Purpose: Provide for development and operation of blimp ports; allow the City to require site requirements and development standards tailored to such operations. § 9113.2.
• Typical permitted uses: The code does not list specific permitted uses for BP beyond the general purpose (development and operation of blimp ports). Not found in retrieved materials: detailed permitted-use table or numeric dimensional standards for BP. Verify with the jurisdiction and the Zoning Map. § 9113.2.
• Key dimensional / approval notes: The ordinance says properties "will be required to meet certain site requirements and development standards" but does not print those standards in § 9113.2. Not found in retrieved materials: the numeric site standards. § 9113.2.
• Where it applies: By notation on the Zoning Map only; see the official Zoning Map on file in the City Clerk’s office (CMC § 9114.1) and confirm parcel designation.

CEM — Cemetery

• Purpose: Permit and regulate cemeteries and related uses. § 9113.2.
• Typical permitted uses: Cemetery uses and related functions; details of screening, parking, landscaping and signage are required as part of development standards but the overlay text itself is descriptive. § 9113.2.
• Key dimensional / approval notes: Code requires adequate setbacks, screening, parking, landscaping, and signage — but does not give page-length numeric tables in § 9113.2. Project-specific standards are handled through development plan or other implementing sections. § 9113.2.
• Where it applies: Only where the Zoning Map shows CEM. Check the map and the specific implementing development sections referenced during project review.

COL — College

• Purpose: Provide for higher-education campuses with classrooms, administrative offices and accessory uses. § 9113.2.
• Typical permitted uses and standards: The overlay recognizes state preemption for certain campus facilities and states that site development standards "will not be required for properties preempted under State law." Academic uses are also subject to applicable State/regent rules. § 9113.2.
• Where it applies: Only where noted on the Zoning Map. Verify state-vs-local jurisdictional rules for specific campus facilities. § 9113.2.

D — Design Overlay (Design Review)

• Purpose: Ensure architectural quality, compatibility, landscape treatment, and functional integration via Site Plan and Design Review. § 9113.2.
• Procedure & effect: Within any D (Design Overlay) area, subsequent development must conform with approved development plans and receive Site Plan and Design Review per the city procedure. The ordinance states no permit shall be issued for grading or construction involving significant exterior changes that conflict with approved plans; see § 9136.9 and the cross-reference to the Site Plan and Design Review procedure § 9172.23.
• Typical permitted uses: Uses remain those of the underlying zone; the overlay adds mandatory design review and possible special design standards. § 9113.2 and § 9136.9.
• Where it applies: Only where D is mapped; design-review standards are implemented through the Planning Division procedures. See the City's design review page for procedural context. Verify with the Planning Division whether a proposed activity qualifies as "significant exterior changes." § 9136.9.

EMS — Electronic Marquee Signage

• Purpose: Allow two freeway-oriented electronic marquee signs (off-site advertising) at identified parcels. § 9113.2; implementing rules in § 9138.71.
• Permitted uses: Off-site outdoor advertising signs limited to the EMS overlay parcels. § 9138.71.
• Dimensional / development standards (decision-relevant): The ordinance sets maximum sign dimensions: height up to 95 ft above freeway grade and width up to 46 ft, requires an approved development plan and Site Plan and Design Review (though the EMS development-plan approval procedure modifies the general Site Plan review rules). § 9138.71.
• Where it applies: Only the four parcels identified in the code and on the Zoning Map; the EMS text explicitly limits eligibility to those parcels associated with the referenced EIR. § 9113.2 and § 9138.71.

MUR — Mixed-Use Residential Overlay

• Purpose: Encourage pedestrian-oriented mixed-use and high-density residential development along specified commercial corridors, providing flexibility for mixed-use projects while managing scale and parking. § 9113.2 and § 9138.7.
• Typical permitted uses: Mixture of office, retail, food service, education, health services, multiple-family residential, senior housing; projects can include market-rate and affordable units. § 9138.7(A).
• Key numeric standards (decision-critical):
  • Minimum lot size for mixed-use: 20,000 sq ft; for exclusively residential: 30,000 sq ft. § 9138.7(B).
  • Minimum street frontage: 100 ft. § 9138.7(C).
  • Floor Area Ratio (FAR): maximum 1.5 overall; where commercial area is included, commercial FAR minimum 0.15 and maximum 0.7; subterranean parking generally excluded from FAR. § 9138.7(D).
  • Setbacks in MUR: front- and side-yard setbacks differ by use/level (e.g., first-floor commercial 10 ft front; first-floor residential 20 ft; subterranean garage 1 ft). See the setback table in the code (front-yard table reproduced in the code). § 9136.24 and related text.
  • Parking and access: Must follow applicable parking provisions of the zoning chapter; residential parking should be secured and separate from commercial parking in mixed-use schemes. § 9138.7(E) and cross-references to parking.
• Where it applies: Only where the Zoning Map shows MUR. Because MUR modifies setbacks and FAR in specific terms, confirm whether a lot is mapped MUR before assuming base-zone standards. § 9113.2 and § 9138.7.

ORL — Organic Refuse Landfill

• Purpose: Regulate land uses on or near organic refuse landfills to protect public health and the environment. § 9113.2.
• Typical permitted uses and standards: The overlay authorizes mitigation measures and special controls (e.g., controls addressing toxicity, fire, explosion, subsidence) but does not list a simple permitted-use table in § 9113.2. For operational specifics the ordinance references conditional-use processes and mitigation requirements elsewhere. § 9113.2 and related conditional-use provisions (e.g., landfill conditional use permit rules in Division 8). Not found in retrieved materials: concrete numeric setback/operational thresholds inside § 9113.2.

MHP — Mobilehome Park Overlay

• Purpose: Maintain, preserve and promote mobilehome parks as affordable rental housing. § 9113.2.
• Key rule (unique and high-priority): The MHP overlay is created over, and automatically applies to, all existing mobilehome parks that were improved or operating as mobilehome parks as of a specified General Plan amendment date; existing mobilehome parks are automatically permitted and need not obtain a CUP. Newly proposed mobilehome park uses are conditionally permitted (CUP required). See § 9113.4 and § 9113.2.
• Where it applies: Applies automatically to mapped/existing parks described in the ordinance; newly proposed parks require CUP (see § 9121.1 and § 9131.1 references for CUP process). § 9113.4.

Quick decision table (most-used overlay standards)

Notes: The table pulls the overlay-level numeric standards the code prints. For many overlays (BP, CEM, COL, ORL) the ordinance gives purpose and directs project-specific standards to later implementing sections or to the CUP/development-plan process; where numeric standards are absent the City expects project-level review. Verify with the Planning Division.

Checklist — what an applicant must satisfy (overlay-related)

• Confirm whether the parcel is mapped with an overlay on the City Zoning Map (Zoning Map on file — CMC § 9114.1).
• For D (Design Overlay) parcels: prepare and submit a Site Plan and Design Review application consistent with the procedure in § 9172.23; demonstrate compliance with approved development plans (see § 9136.9).
• For MUR projects: demonstrate minimum lot size (20,000 sq ft for mixed-use; 30,000 sq ft for residential), 100 ft frontage, and FAR calculations (max 1.5, with commercial FAR 0.15–0.7) in the development plan; show separate, secured residential parking where required. § 9138.7.
• For EMS parcels: submit a development plan and sign design per § 9138.71 showing compliance with the 95 ft × 46 ft sign limit and the EMS parcel eligibility rules.
• For MHP overlay properties: if existing mobilehome park as of the ordinance date, confirm the status under § 9113.4; for new parks, prepare a CUP per § 9121.1 and § 9131.1.
• If proposing ADUs on overlay-mapped lots: follow ADU-specific standards (ministerial approval if standards met) and ensure compliance with overlay-specific rules where the overlay imposes objective standards. See § 9122.1 for ADU procedural and dimensional rules.

Risks & Ambiguities

Plain-English Summary

Carson's overlay districts are map-based tags that layer special purposes and rules onto whatever base zone sits on your lot — some overlays (like MUR and EMS) spell out numeric standards (lot size, FAR, sign size), others (like BP, CEM, ORL) state purposes and rely on project-level conditions; always check the Zoning Map and the specific code section for that overlay (see § 9113.2 and the individual sections cited above) before designing a project.

Information Gaps

• Exact mapped parcel lists / graphic boundaries for each overlay are not printed in the ordinance text snippets; the Zoning Map (on file) controls actual extent. See § 9114.1.
• Numeric development standards for overlays BP, CEM, and ORL are not printed in § 9113.2; the code indicates site-specific requirements will apply, but the ordinance text does not provide them. Verify with the Planning Division.
• Detailed step-by-step forms, filing fees, and submittal checklists for overlay-specific development plans/CUPs are administrative and not contained in these code excerpts. Verify with the Planning Division.

Source References

• Carson Municipal Code, Article 9 (Planning and Zoning), Division 3 — Overlay Districts: § 9113.2 (list and purposes of overlays).
• Carson Municipal Code — Mixed-Use Residential overlay standards: § 9138.7 (minimum lot size, frontage, FAR, parking/access rules).
• Carson Municipal Code — D (Design Overlay) site-plan/design-review requirements: § 9136.9 (conformance with approved development plans; reference to Site Plan and Design Review § 9172.23).
• Carson Municipal Code — EMS overlay and sign standards: § 9138.71 (EMS purpose, permitted use, sign dimensions).
• Carson Municipal Code — MHP overlay rules and conditional-permit guidance: § 9113.4 (MHP automatic application to existing mobilehome parks; new parks require CUP).
• Carson Municipal Code — Accessory Dwelling Units (ADU) rules (ministerial approval, setbacks, sizes, parking): § 9122.1 and related ADU subsections (setback 4 ft, detached ADU max 1,200 sq ft, attached limits).
• Carson Municipal Code — Zoning Map and interpretation: § 9114.1 (map is part of the code).

Retrieved passages

• CMC § 9 (§ 9) High relevance show source text
• CMC § 9 (§ 9) High relevance show source text
• CMC § 9402 (§ 9402) Medium relevance show source text
• CMC § 6 (§ 6) Medium relevance show source text
• CBC § 10 (§ 10) Medium relevance show source text
• CMC § 1 (§ 1) Medium relevance show source text
• CMC § 9138.2 Medium relevance show source text
• CMC § 9172.21 (Chapter 8) Medium relevance show source text
• CMC § 4 (§ 4) Medium relevance show source text
• Carson Zoning Code (Article IX) Medium relevance show source text
• CMC § 9 (§ 9) Medium relevance show source text
• CMC § 2 (Chapter relating) Medium relevance show source text
• Carson Zoning Code (Article IX) Medium relevance show source text
• Carson Zoning Code (Article VIII) Medium relevance show source text
• Carson Zoning Code (Section shall) Medium relevance show source text
• Carson Zoning Code Medium relevance show source text
• Carson Zoning Code (title to) Medium relevance show source text
• CMC § 9126.91 Medium relevance show source text
• Carson Zoning Code (Section shall) Medium relevance show source text

Cited sections

• Carson Municipal Code, Article 9 (Planning and Zoning), Division 3 — Overlay Districts: **§ 9113.2** (list and purposes of overlays). (Article 9)
• Carson Municipal Code — Mixed-Use Residential overlay standards: **§ 9138.7** (minimum lot size, frontage, FAR, parking/access rules). (§ 9138.7)
• Carson Municipal Code — D (Design Overlay) site-plan/design-review requirements: **§ 9136.9** (conformance with approved development plans; reference to Site Plan and Design Review **§ 9172.23**). (§ 9136.9)
• Carson Municipal Code — EMS overlay and sign standards: **§ 9138.71** (EMS purpose, permitted use, sign dimensions). (§ 9138.71)
• Carson Municipal Code — MHP overlay rules and conditional-permit guidance: **§ 9113.4** (MHP automatic application to existing mobilehome parks; new parks require CUP). (§ 9113.4)
• Carson Municipal Code — Accessory Dwelling Units (ADU) rules (ministerial approval, setbacks, sizes, parking): **§ 9122.1** and related ADU subsections (setback **4 ft**, detached ADU max **1,200 sq ft**, attached limits). (§ 9122.1)
• Carson Municipal Code — Zoning Map and interpretation: **§ 9114.1** (map is part of the code). (§ 9114.1)
• Carson_ZoningCode.md

• Official Carson code library