Local zoning · Signal Hill

Signal Hill — Overlay Districts

Overlay Districts under the Signal Hill local zoning and planning code, with the controlling citations.

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Last reviewed: July 2, 2026

Overview

Signal Hill treats overlays and specific-plan districts as layers that sit on top of base zoning: they add place-specific standards, override the underlying zoning where they conflict, and often require a compliance or site-plan process. The municipal code contains a dedicated overlay (the Orange Avenue Overlay District) and multiple Specific Plan (SP) districts (e.g., SP-7, SP-8, SP-9, SP-13, SP-21, SP-23, SP-24) whose provisions apply to mapped parcels and prevail over other zoning rules. See the city's Signal Hill Zoning and Signal Hill Development Standards pages for related program context. § 20.21.010

How Signal Hill defines and applies overlays

  • An overlay for Orange Avenue is established as a zoning layer that is "superimposed upon existing zoning districts" and requires properties "to be developed and maintained in accordance with the provisions of the underlying zoning district as well as this overlay zone." Where there is a conflict, the overlay controls. § 20.21.010
  • Specific plans (SP districts) function in the same operational way: they are applied to parcels on the Official Zoning Map, set site-specific permitted uses and design/development standards, and state that the specific plan prevails in any inconsistency with other city regulations. See example language in § 20.41.010 (SP-7) and parallel language in other SP chapters.

Note: many SP chapters explicitly tie project approval to the city's site-plan and design-review process (Chapter 20.52) — see discussion under each district below and the city's Signal Hill Design Review information. § 20.20.130

District-by-district breakdown

Each subsection below summarizes the ordinance purpose, typical permitted uses, key dimensional standards, and where the overlay/specific-plan applies. Bolded names and numeric standards are used for quick scanning, and the controlling code citation (with the Signal Hill file preview marker) is provided for each factual point.

Orange Avenue Overlay District (Chapter 20.21)

  • Purpose: Improve appearance and encourage redevelopment along Orange Avenue between Willow and Hill Streets by superimposing new property maintenance, landscaping, fencing, and setback rules on existing underlying zones. § 20.21.010
  • Typical permitted uses: Underlying zoning uses remain in force; the overlay does not list new permitted uses but requires compliance with overlay standards in addition to underlying uses. § 20.21.010
  • Key dimensional/development standards:
    • Front building setback: 10 ft (from established future R/W) § 20.21.030(A)
    • Parking lot setback: 5 ft § 20.21.030(A)
    • Outdoor storage setback: 5 ft; Rear and side setbacks: 0 ft § 20.21.030(A)
    • Fencing at existing storage yards must meet specific screening, maintenance, and setback rules; replacements are required if nonconforming (see § 20.21.050).
    • Landscaping minimums for storage yards and parking lots are required (trees, groundcover, irrigation); see § 20.21.060.
  • Compliance mechanism: property owners must submit and implement a compliance plan referenced in the overlay (see § 20.21.010). Content of the compliance-plan procedure is described by reference to § 20.21.090 (text of that section not located in retrieved snippets).

Practical note: Orange Avenue Overlay language explicitly overrides the underlying zone where conflicts arise — applicants should compare both the base zone rules and Chapter 20.21 when designing projects. § 20.21.010

SP-7 — Special Purpose Housing Specific Plan (Chapter 20.41, multiple Area subparts)

  • Purpose: Create site-specific controls to enable affordable and special-needs multi‑family housing for mapped Area(s) (Areas One, Two, Four, Five, Seven, Eight, etc.). See § 20.41.010 and adoption/area-specific sections.
  • Typical permitted uses:
    • Multi-family dwelling units (permitted where listed); accessory uses are specifically enumerated (management offices, community rooms, laundry, open space). See area-specific lists (e.g., § 20.41.030, 20.41.1115, 20.41.820).
  • Key dimensional/development standards (varies by Area):
    • Heights examples: max 48 ft / 4 stories for certain Area provisions; others limit 25 ft / 2 stories or 40–48 ft depending on Area — consult the Area-specific height section (e.g., § 20.41.850, 20.41.220, 20.41.955).
    • Setbacks: many SP Areas require conformance to the approved site plan; specific setback rules are contained in each Area's development-standards subsection (e.g., "setbacks shall substantially conform to the approved site plan" in § 20.41.860/ 20.41.955).
    • Landscaping/hardscape limits: front setback hardscape caps and turf/replacement guidance (e.g., § 20.41.865) apply to certain Areas.
  • Where it applies: to properties shown as SP‑7 on the Official Zoning Map; each Area lists APNs or map exhibits (e.g., Area 7 boundary language and adoption clause § 20.41.1005).

Process note: SP-7 projects require review under the city's site-plan and design-review procedures (Chapter 20.52) and often planning-commission action for substantive changes. § 20.41.1010(B)

SP-8 — Signal Hill Village Specific Plan (Chapter 20.43)

  • Purpose: Guide development of the village area to achieve pedestrian-scale streetscapes and affordable housing goals. § 20.43.010
  • Typical permitted uses: single‑family detached dwellings (including units with affordability restrictions) and enumerated accessory uses (garages, open space). § 20.43.010 – 20.43.020
  • Key standards: maximum height 25 ft / 2 stories (Area-specific; see § 20.33.230 and SP-8 provisions); parking and parking-stall dimensions are specified in SP text (e.g., § 20.41.965 for a different SP but similar approach).
  • Where it applies: parcels designated SP‑8 on the Official Zoning Map. § 20.43.020

SP-9 — Bixby Ridge Specific Plan (Chapter 20.44)

  • Purpose: Guide hillside development, preserve natural appearance, and regulate building form near the hill flank. § 20.44.010
  • Typical permitted uses: SP-9 defines permitted uses in its specific-plan text incorporated by reference; development standards and plan text are incorporated into the chapter. § 20.44.020
  • Key standards: site-specific design and infrastructure requirements; see the Bixby Ridge plan text incorporated into the chapter. § 20.44.020
  • Where it applies: property shown as SP‑9 on the Official Zoning Map. § 20.44.020

SP-13 — Cherry Avenue Corridor Residential Specific Plan (Chapter 20.33)

  • Purpose: Provide detailed development guidance for the Cherry Avenue corridor (pedestrian scale, design diversity). § 20.33.190–.230
  • Uses and standards: permits transitional/supportive housing, detached single‑family, and sets a max building height 25 ft and max 2 stories for certain Areas; density and building-height provisions appear in § 20.33.220–.230.
  • Where it applies: mapped SP‑13 parcels on the Official Zoning Map. § 20.33.190

SP-21 — The Courtyard Specific Plan (Chapter 20.27 / 20.28)

  • Purpose: Site-specific small lot single-family development standards and design requirements. § 20.27.030; 20.28.050–.060
  • Uses: detached single-family dwellings and associated accessory uses listed in § 20.27.030.
  • Key standards: specific dwelling counts/densities, height limits by lot (e.g., 22'‑9" and 23' maximum listed), and site-plan conformance requirements. § 20.28.060; 20.28.040
  • Where it applies: property mapped SP‑21 on the Official Zoning Map. § 20.27.030

SP-23 — Heritage Square Central Business District Specific Plan (Chapter 20.26)

  • Purpose: Create a mixed‑use central business district with urban building forms, pedestrian emphasis, and integrated housing. § 20.26.010–.040
  • Uses: allows mixed‑use commercial and residential development as permitted uses; unlisted uses prohibited without authorization. § 20.26.040
  • Process and standards: SP-23 establishes urban design standards and requires Planning Commission site-plan and design-review pursuant to Chapter 20.52 for project approval. § 20.26.030(B)
  • Where it applies: mapped SP‑23 areas on Official Zoning Map. § 20.26.020

SP-24 — Town Center Northwest Specific Plan (Chapter 20.46)

  • Purpose: Guide mixed‑use town-center development for pedestrian activity and integrated housing. § 20.46.010
  • Uses: allows mixed‑use commercial and residential development and establishes specific building-form standards; project approvals typically require Planning Commission site-plan and design review. § 20.46.030(B)
  • Where it applies: parcels shown SP‑24 on Official Zoning Map. § 20.46.020

Quick-reference table — decision‑relevant standards and uses

District Key permitted uses / decision points Code reference
Orange Avenue Overlay Apply overlay standards in addition to base zone; Front setback 10 ft, Parking setback 5 ft, fence screening/maintenance, required landscaping and a compliance plan § 20.21.010–.060
SP‑7 Multi‑family and accessory uses for mapped Areas; area-specific heights (examples: 48 ft/4 stories in some Areas, 25 ft/2 stories in others); site-plan conformance required § 20.41.010; 20.41.850; 20.41.860; 20.41.1115
SP‑8 Signal Hill Village standards; single‑family detached, max heights ~25 ft (Area-dependent); site-plan/design-review required § 20.43.010–.020; 20.41.965 (parking example)
SP‑9 Bixby Ridge specific plan controls (hillside protection, streetscape, utilities) § 20.44.010–.020
SP‑13 Cherry Corridor: transitional/supportive housing, detached single‑family; max height 25 ft for specified Areas § 20.33.190–.230
SP‑21 The Courtyard: small-lot single‑family; lot-specific height limits (22'‑9"/23'); site-plan conformity § 20.27.030; 20.28.050–.060
SP‑23 Heritage Square mixed‑use standards; Planning Commission review required § 20.26.010–.040
SP‑24 Town Center Northwest mixed‑use standards; Planning Commission review required § 20.46.010–.030

Practical guidance and cross‑references

  • Design and approvals: most SP and overlay projects require design review under Chapter 20.52; verify whether Director-level administrative review or Planning Commission resolution is required per the SP chapter (many SPs specify the reviewer). § 20.20.130; SP chapters
  • Parking: follow the off‑street parking standards referenced in SP text or general parking chapter (Chapter 20.70); SPs often modify or supplement Chapter 20.70 requirements — check the SP parking subsection. See Signal Hill Parking. § 20.41.965; 20.49.070
  • Development standards & setbacks: SPs frequently state that "setback lines shall substantially conform to the approved site plan" rather than a single numeric setback — confirm the approved site plan and any SP numeric standards in the Area section. See Signal Hill Development Standards. § 20.41.860; 20.41.955
  • Landscaping and screening: overlays and SPs include parcel- or area-specific landscaping rules (e.g., Orange Avenue § 20.21.060; SP-7 § 20.41.865) — consult the Signal Hill Landscaping and Screening guidance.
  • Signs and mechanical equipment: some SP chapters restrict signage and require screening of rooftop/mechanical equipment (see SP-8/SP-7 signage and mechanical rules). Link to Signal Hill Signage for citywide rules.
  • Building code interface: overlay/SP standards are zoning controls — construction-level compliance still follows the California Building Standards Code (Title 24) and permit processes. The zoning provisions do not replace Title 24 requirements. Not a substitute for permit-level code checks. (Verify with the jurisdiction.)

Checklist (what an applicant must satisfy)

  • Confirm the property is mapped within an overlay or Specific Plan (SP) district on the Official Zoning Map (example: SP‑7, SP‑23, Orange Avenue Overlay). See the relevant SP chapter adoption clause.
  • Compare the overlay/SP provisions with the underlying base zone; where inconsistent, follow the overlay/SP mandatory provisions (Orange Ave: § 20.21.010).
  • Prepare site plans showing conformance to SP area-specific height, setback, landscaping, parking, and fencing/screening rules cited in the SP or overlay (see applicable Area sections).
  • Submit materials required for Site Plan & Design Review under Chapter 20.52; identify whether Director or Planning Commission review is specified in the SP chapter.
  • For Orange Avenue Overlay properties, prepare the compliance plan described by the overlay and be ready to implement it per the timeline in the ordinance (see § 20.21.010 and reference to § 20.21.090).
  • Confirm off‑street parking counts and stall dimensions — follow SP parking subsections or Chapter 20.70 where referenced.
  • Confirm signage, trash enclosure, and mechanical screening requirements listed in the SP chapter.

Risks & Ambiguities

Issue Why it matters What to verify
Conflict between overlay/SP text and underlying zone Overlays/SPs may alter setbacks, uses, or development rules; relying only on base zone can lead to noncompliance Verify the project against the overlay/SP provisions and the Official Zoning Map; overlays state they govern in conflicts § 20.21.010
Content of Orange Avenue compliance plan procedure The overlay mandates a compliance plan but the full procedural text for § 20.21.090 was not found in retrieved snippets Review § 20.21.090 text with the City (not found in retrieved materials)
Area‑specific variations inside SPs Heights, setbacks, uses differ by SP Area; quoting a single SP headline can be misleading Check the exact Area section (e.g., SP‑7 Area One vs. Area Eight) for numeric standards § 20.41.xxx
Whether administrative vs. commission review applies SP chapters alternatively assign Director-level administrative review or Planning Commission review Verify reviewer and submittal requirements in the specific SP chapter (e.g., § 20.26.030(B) for SP‑23)
Parcel‑specific mapping / official map updates The Official Zoning Map controls where an overlay/SP applies; map changes or ordinances can reassign parcels Confirm current Official Zoning Map with the City (Verify with the jurisdiction)

Information Gaps

  • Full text of § 20.21.090 (the Orange Avenue Overlay "compliance plan" procedures) was referenced but its detailed procedural text was not present in the retrieved snippets. Verify the full language with the City. Not found in retrieved materials.
  • Complete, consolidated table of all overlays beyond Orange Avenue (if other minor overlay chapters exist) was not found in the retrieved excerpts; the code contains many SP chapters that function like overlays but a single "overlay" chapter list was not located. Verify via the Official Zoning Map and Code index. Not found in retrieved materials.

Plain-English Summary

Signal Hill uses one mapped overlay (the Orange Avenue Overlay) and several mapped Specific Plan districts (SP‑7, SP‑8, SP‑9, SP‑13, SP‑21, SP‑23, SP‑24, etc.) to apply place-specific rules that override the base zoning when they conflict; each mapped area lists permitted uses, heights, setbacks, landscaping, and review steps that you must follow when planning work on a parcel within those maps. See the specific chapter for your parcel to know exact numeric standards (e.g., Orange Ave front setback 10 ft) and whether a compliance plan or design-review application is required. § 20.21.010; SP chapters

Source References

  • Signal Hill Municipal Code, Chapter 20.21, Orange Avenue Overlay District — § 20.21.010–.060.
  • Signal Hill Municipal Code, Chapter 20.41, SP‑7 Special Purpose Housing Specific Plan — (adoption, use classifications, Area standards) § 20.41.010; 20.41.1005; 20.41.1115; 20.41.850; 20.41.865.
  • Signal Hill Municipal Code, Chapter 20.43, SP‑8 Signal Hill Village Specific Plan — § 20.43.010–.020; 20.41.965 (parking example).
  • Signal Hill Municipal Code, Chapter 20.44, SP‑9 Bixby Ridge Specific Plan — § 20.44.010–.020.
  • Signal Hill Municipal Code, Chapter 20.33, SP‑13 Cherry Avenue Corridor — § 20.33.190–.230.
  • Signal Hill Municipal Code, Chapter 20.27 / 20.28, SP‑21 The Courtyard Specific Plan — § 20.27.030; 20.28.040–.060.
  • Signal Hill Municipal Code, Chapter 20.26, SP‑23 Heritage Square Central Business District Specific Plan — § 20.26.010–.040.
  • Signal Hill Municipal Code, Chapter 20.46, SP‑24 Town Center Northwest Specific Plan — § 20.46.010–.030.
  • Site-plan/design-review reference (Chapter 20.52) and general commercial/industrial project review rules — § 20.20.130.

Sources

Retrieved passages

  • Signal Hill Zoning Code (chapter by) High relevance
  • Signal Hill Zoning Code (Chapter 20.52) High relevance
  • Signal Hill Zoning Code (§ 6) Medium relevance
  • Signal Hill Zoning Code (§ 65450) Medium relevance
  • Signal Hill Zoning Code (chapter is) Medium relevance
  • Signal Hill Zoning Code (§ 2) Medium relevance
  • Signal Hill Zoning Code (§ 9) Medium relevance

Cited sections

Frequently asked questions

What does the Orange Avenue Overlay require that the base zone does not?

The Orange Avenue Overlay requires property-maintenance upgrades, new landscaping and irrigation, fenced-storage screening, and specific reduced/setback rules for frontage improvements (for example 10 ft front setback for buildings and 5 ft for parking) and requires a compliance plan; the overlay governs in any conflict with the underlying zone. § 20.21.010–.030

How do I know whether my lot is in an SP overlay like SP‑7 or SP‑23?

Check the Official Zoning Map for parcels labeled SP‑7, SP‑23, etc.; each SP chapter also contains an "Adoption" clause stating that the chapter applies to property shown on the Official Zoning Map (for example § 20.41.1005 for SP‑7 and § 20.26.020 for SP‑23). Verify the map with the City for current boundaries.

If the SP and the underlying zoning differ, which rules control?

The SP or overlay controls where there is an inconsistency — SP chapters and the Orange Avenue Overlay explicitly state that their provisions prevail over conflicting ordinances or regulations. § 20.21.010; SP adoption clauses

Do overlays change permitted uses?

Some SP chapters list permitted principal and accessory uses for the mapped area (e.g., SP‑7 lists multifamily and accessory services in Area sections); the Orange Avenue Overlay does not create new principal uses but imposes maintenance, setback, and screening standards on existing uses. Always consult the SP or overlay chapter for the allowed uses for that mapped area. § 20.41.030; 20.21.010

Will I need design review for a project in an SP or overlay?

Yes — most SPs and the commercial/industrial development rules tie project approval to the city's Site Plan and Design Review procedures (Chapter 20.52). Some SPs require Planning Commission review for substantive changes; others allow Director-level administrative review. Confirm the reviewer in the SP chapter. § 20.20.130; SP chapters

What are typical height limits in SP districts?

Height limits vary by SP and by Area within an SP: examples in the code include 25 ft / 2 stories for some SP Areas and 48 ft / 4 stories for others — always read the Area-specific "Building height" subsection applicable to your parcel (e.g., § 20.41.850 for one SP height rule).

Does the overlay affect parking counts and stall sizes?

SPs typically either reference Chapter 20.70 or provide SP‑specific parking ratios and stall-dimension rules. Confirm whether the SP modifies Chapter 20.70 requirements; some SPs set their own stall sizes and ratios. § 20.41.965; 20.49.070

Where can I find the compliance plan requirements for Orange Avenue?

The overlay references a compliance plan (see § 20.21.010) and cross‑references § 20.21.090 for details; the detailed text of § 20.21.090 was not present in the retrieved excerpts, so obtain the full text from the City clerk or online municipal code. Not found in retrieved materials.

Can an SP prohibit uses that otherwise would be allowed by the base zone?

Yes. SP chapters often state "Unlisted uses shall be prohibited" or otherwise limit permissible uses to those expressly listed in the SP; the SP therefore can be more restrictive than the underlying zoning. See the use-classification language in SP chapters (e.g., § 20.26.040 and SP‑7 use lists).

Who enforces overlay compliance and maintenance obligations?

The municipal code indicates the Community Development/Planning Department enforces compliance (the Orange Avenue Overlay requires implementation of a compliance plan and allows city oversight); enforcement mechanics may be described elsewhere in the code or the compliance-plan section. Check the overlay's compliance-plan clause and contact the Community Development Department to confirm enforcement steps. § 20.21.010

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