Norco — Overlay Districts

Last reviewed: July 2, 2026

Overview

Norco’s zoning ordinance (Title 18, Zoning) uses several overlay zones to add site‑specific rules on top of the city’s base zones. Overlays in Norco are legislative/special districts that either preserve local character (for example, the Historic Preservation Overlay Zone) or enable specific policy goals (for example, the Housing Development Overlay). Below I summarize each overlay actually defined in the Norco code, what it allows or limits, where it applies, and the most decision‑relevant standards and process triggers — with exact code citations for every requirement so you can verify on the official text.

(First time I mention related topics I’ve linked to Norco pages you’ll likely want while applying: see zoning & planning overview, zoning, land use, development standards, parking, design review, landscaping and screening, and ADUs.)

Which overlays exist in Norco (quick list)

• Animal‑Keeping Overlay (AKO) — Chapter 18.16.
• Planned Development Overlay (PD) — Chapter 18.27.
• Commercial Transition Overlay (CTO) — Chapter 18.61.
• Housing Development Overlay (HDO) — Chapter 18.64.
• Historic Preservation Overlay Zone (HPOZ) — Chapter 18.58.
• Pedestrian‑Equestrian Trails (P‑E) (listed as an overlay zone in the zone table) — Chapter 18.28.

Below is a district‑by‑district breakdown that is Norco‑specific (purpose, typical permitted uses, notable standards, and where it applies). Each item is grounded to the controlling section(s) of the code.

Animal‑Keeping Overlay (AKO)

• Purpose: The AKO is created to officially designate properties within the R‑1‑10 base zone that are to be used for animal‑keeping while retaining the underlying zoning’s uses; it is intended to protect existing uses while allowing and encouraging animal keeping where criteria are met (§ 18.16.10) .
• Typical permitted uses: All uses of the underlying R‑1‑10 remain (no change to underlying permitted uses); in addition, the property is allowed adult animal units up to the limits specified in the AKO standards (see animal‑unit table) (§ 18.16.30) .
• Key dimensional/operational standards:
  • Underlying zone development standards continue to apply; the AKO adds animal‑keeping standards (§ 18.16.40) .
  • Maximum adult animal units are tied to lot size (table in § 18.16.50). Examples: 10,001–12,500 sf = 1 adult animal unit, 20,001–25,000 sf = 5 adult animal units (see the code table in § 18.16.50) .
  • Minimum 500 sf of flat usable area required per adult animal unit; animals must be kept 35 ft from adjacent residences unless separated by a solid fence ≥ 6 ft (§ 18.16.50(4)–(5)) .
  • No commercial boarding on AKO properties; AKO properties must be adjacent to a horse trail (§ 18.16.50(6)–(7)) .
• Where it applies / how established: Applied by zone change and shown on the official map as a suffix (e.g., R‑1‑10 (AKO‑1)); AKO is established by Planning Commission or City Council or upon owner request (§ 18.16.20, 18.16.60) .

Practical note: AKO does not supersede base setbacks, parking, or lot coverage rules — those continue to come from the underlying zone and from the Development Standards and Parking chapters; check the underlying base zone §§ (e.g., R‑1 standards) for height, coverage and yard depths (§ 18.15.18–28) .

Planned Development Overlay (PD)

• Purpose: The PD overlay allows a site‑specific development plan enabling combinations of uses, departures from specific zone provisions where the adopted PD plan authorizes them, and a coordinated design approach (§ 18.27.02) .
• Typical permitted uses: Only those uses shown and approved on the PD development plan are permitted; PDs may include residential, commercial, public/semi‑public and integrated uses when consistent with the General Plan (§ 18.27.06 and § 18.27.08) .
• Key standards/process triggers:
  • A Preliminary Development Plan must be submitted and approved before land development in a PD (items required are enumerated in § 18.27.46) — the plan addresses uses, densities, circulation (vehicular, equestrian, pedestrian), open space, grading, utilities, and architectural concepts (§ 18.27.46) .
  • Final development plan must be substantially in conformance with the preliminary plan; the PD may specify maximum height, bulk, yards, parking and loading requirements for that PD (§ 18.27.14, 18.27.52) .
  • If the PD fails to reach construction milestones, the PD overlay can be terminated and the zoning revert to the base zone (§ 18.27.56–58) .
• Where it applies: PD zones are applied as a suffix (e.g., A‑1‑20 (PD‑1)) and must be numbered on the official zoning map (§ 18.27.04) .

Practical note: PDs frequently require coordinated review under Design Review and conditions addressing landscaping and screening; confirm required submittals with Planning.

Commercial Transition Overlay (CTO)

• Purpose: The CTO is intended to facilitate the transition of specific properties toward C‑G (Commercial General) while preserving rights of existing underlying uses; the CTO is superimposed on base zones and establishes additional regulations but does not change the underlying zoning category (§ 18.61.10) .
• Typical permitted uses: All permitted and conditionally permitted uses of the underlying zone remain permitted per § 18.61.30; the CTO itself does not create new base uses, it adds transitional controls (§ 18.61.30) .
• Key standards:
  • Underlying zone development standards continue to apply; where conflicts exist, CTO provisions control (§ 18.61.40–20) .
  • CTO areas get suffixes and are numbered on the zoning map (e.g., M‑1 (CTO‑1)) (§ 18.61.20) .
• Where it applies: Applied by zone change and depicted on the official map; used to protect existing uses while managing prospective commercial conversion (§ 18.61.10–20) .

Practical note: Because CTO preserves underlying uses, property owners should consult both the CTO chapter and the underlying zone standards (setbacks, parking, signage) when designing changes — see Signage and Parking rules.

Housing Development Overlay (HDO)

• Purpose: The HDO Zone facilitates and encourages affordable housing consistent with State Government Code Article 10.6 and Norco’s Housing Element; HDO applies to specific properties shown on the zoning map and requires an HDO site plan for each site (§ 18.64.02) .
• Typical permitted uses: Upon approval of an HDO site plan, residential development is the primary allowed use; the chapter anticipates mixed‑use contexts but development must follow the approved HDO site plan (§ 18.64.08) .
• Key standards/process triggers:
  • If applied via zone change, HDO is indicated on the zoning map with suffixes (e.g., HDO‑1 (C‑G)) (§ 18.64.04) .
  • Projects in an HDO must follow the requirements of Chapter 18.47 (Amendments and Zone Changes) and submit an HDO site plan; where conflict exists, the HDO chapter controls (§ 18.64.04–06) .
• Where it applies: Specific mapped sites only; HDO establishes a site plan requirement and may supersede conflicting local requirements for the designated area (§ 18.64.02–06) .

Practical note: HDO projects typically require coordination with Development Standards and site plan/architectural review chapters; HDOs are vehicle to implement affordable housing where the city and developer agree a site plan is appropriate.

Historic Preservation Overlay Zone (HPOZ)

• Purpose: The HPOZ aims to protect and enhance buildings, structures, landscaping and other features of historic significance and to promote public understanding of the city’s history (§ 18.58 intent list) .
• Typical permitted uses: Underlying permitted and conditionally permitted uses and development standards apply except where the HPOZ chapter specifies otherwise (§ 18.58.06) .
• Key standards/process triggers:
  • HPOZ designation requires a historic resources survey and context statement; the ordinance defines contributing vs noncontributing elements and assigns the Cultural Resources Administrator/Historic Preservation Commission roles for review and findings (§ 18.58.04 definitions; § 18.58.10 establishment) .
  • Specific plan amendments or specific plans affecting historic properties must be reviewed by the Historic Preservation Commission prior to Planning Commission/City Council action (§ 18.58.08) .
• Where it applies: To mapped historic areas designated by ordinance; HPOZ areas are subject to additional review procedures beyond the base zone (§ 18.58.10) .

Practical note: HPOZ changes often trigger review of exterior materials, signage and landscaping (coordinate early with the Historic Preservation Commission and see Design Review).

Pedestrian‑Equestrian Trails (P‑E)

• Purpose: The P‑E zone provides a regulatory framework for pedestrian and equestrian trails within rights‑of‑way, public easements and private access easements and reflects Norco’s community emphasis on equestrian activity (§ 18.28.02) .
• Typical permitted uses: Trail and trail‑related uses, tied to public and private easements; site development rules and review requirements are spelled out where the P‑E applies (§ 18.28.02–04) .
• Key standards: P‑E establishes trail compatibility requirements and is used to safeguard public safety and equestrian circulation; see Chapter 18.28 for applicability and development triggers (§ 18.28.02–04) .
• Where it applies: Mapped trail corridors, public easements and where rights‑of‑way include trail designations.

Practical note: P‑E overlay considerations should be checked early for any subdivision or site plan that abuts trails or proposes equestrian access; coordination with public works and the Planning Department is typical.

Quick reference table — decision‑relevant items

Checklist — what an applicant must satisfy (typical)

• Confirm the parcel’s overlay(s) and mapped suffix on the Official Zoning Map (Verify with the Planning Department) (§ 18.03.06) .
• For AKO: demonstrate lot size and calculate maximum adult animal units; show 500 sf usable area per adult animal unit and setbacks; include proof of adjacent trail if required (§ 18.16.50) .
• For PD: prepare and submit a Preliminary Development Plan with required elements (legal description, topo, uses, grading, circulation, open space, etc.) and follow with a Final Development Plan (§ 18.27.46, 18.27.52) .
• For HDO: prepare an HDO site plan demonstrating compliance with the HDO chapter and State affordable‑housing intent; follow zone change/site plan procedures in Chapter 18.47 (§ 18.64.02–06) .
• For HPOZ: if property is in HPOZ, provide documentation required by the historic resources survey/context statement; expect Historic Preservation Commission review (§ 18.58.04–08) .
• Show compliance with underlying zone development standards (setbacks, coverage, heights), and with related chapters (site plan review, architectural/design review, parking, signage, landscaping and screening). Where overlay conflicts exist, overlay rules control (§ 18.16.40, 18.61.40, 18.58.06) .
• Determine whether design review / architectural review is required (PDs, HPOZ, many HS projects trigger Design Review) (§ 18.27.14, 18.58.08, 18.26.26) .
• If a variance or exception is needed, pursue procedures in Chapter 18.47 or the Variances chapter (Verify with the jurisdiction) (§ 18.47 — see Variances and Exceptions).

Risks & Ambiguities

If a matter is parcel‑specific (for example, exact overlay boundary, legal vs. physical lot area used for AKO calculations, or whether a building is “contributing” in an HPOZ), note: Verify with the jurisdiction.

Plain‑English summary

Norco’s overlays are mapped add‑ons to the base zoning that either preserve things (Historic Preservation, Pedestrian‑Equestrian trails) or enable policy (Animal‑Keeping, Housing, Commercial Transition, Planned Developments). Overlays don’t generally replace the base zone — they add or modify rules — and most are applied by zone change and shown as suffixes on the official zoning map; follow the overlay chapter’s required submittals (HDO site plan, PD preliminary plan, AKO animal‑unit demonstration, etc.) to avoid surprises. Key controlling citations are included below so you can confirm specifics (§ 18.16, 18.27, 18.61, 18.64, 18.58, 18.28).

Source References

• Norco Municipal Code — Animal‑Keeping Overlay: § 18.16.10–60.
• Norco Municipal Code — Planned Development Overlay: § 18.27.02–58.
• Norco Municipal Code — Commercial Transition Overlay: § 18.61.10–50.
• Norco Municipal Code — Housing Development Overlay: § 18.64.02–08.
• Norco Municipal Code — Historic Preservation Overlay Zone: § 18.58.04–10.
• Norco Municipal Code — Pedestrian‑Equestrian Trails (P‑E): § 18.28.02–04.
• Official zone list / Official Zoning Map rules (zones & overlays): § 18.03.02–06.

(For related procedural and technical items you will almost always need to consult these Norco pages: Norco Zoning, Norco Land Use, Norco Development Standards, Norco Parking, Norco Design Review, Norco Landscaping and Screening, and Norco ADUs.)

Retrieved passages

• Norco Zoning Code (§ 18.27.42.) High relevance show source text
• Norco Zoning Code (chapter are) High relevance show source text
• Norco Zoning Code (Chapter 18.61.) High relevance show source text
• Norco Zoning Code (title report.) High relevance show source text
• Norco Zoning Code (§ 18.15.32.) Medium relevance show source text
• Norco Zoning Code (§ 18.15.18.) Medium relevance show source text
• Norco Zoning Code (Chapter 18.27.) Medium relevance show source text
• Norco Zoning Code (§ 18.17.10.) Medium relevance show source text

Cited sections

• Norco Municipal Code — **Animal‑Keeping Overlay**: § **18.16.10–60**.
• Norco Municipal Code — **Planned Development Overlay**: § **18.27.02–58**.
• Norco Municipal Code — **Commercial Transition Overlay**: § **18.61.10–50**.
• Norco Municipal Code — **Housing Development Overlay**: § **18.64.02–08**.
• Norco Municipal Code — **Historic Preservation Overlay Zone**: § **18.58.04–10**.
• Norco Municipal Code — **Pedestrian‑Equestrian Trails (P‑E)**: § **18.28.02–04**.
• Official zone list / Official Zoning Map rules (zones & overlays): § **18.03.02–06**.
• Norco_ZoningCode.md

• Official Norco code library