Norco — Historic Preservation

Last reviewed: July 2, 2026

Overview

This page summarizes how Norco regulates historic resources through its Historic Preservation Overlay Zone (HPOZ) and related review processes. It is grounded in Norco’s zoning ordinance; the overlay does not replace underlying zone rules but adds procedures (surveys, designation, certificates of appropriateness, appeals) that you must follow for properties inside an HPOZ. See how HPOZ interacts with underlying zones like R-1, A‑E, C‑4, and CG, and what design/plan material you will need. Parking, design review, development standards, and exemptions for registered historic sites are specifically addressed. (§ 18.58.02, § 18.58.06)

How Norco structures historic preservation (high level)

• The city creates a Historic Preservation Overlay Zone (HPOZ) to protect areas with historic, architectural, cultural or aesthetic significance. The HPOZ’s purposes include protecting historic fabric, stabilizing neighborhoods, encouraging economic benefits, and ensuring CEQA compliance. § 18.58.02
• The HPOZ is an overlay only: “all permitted and conditionally permitted uses and all development standards shall be in accordance with the underlying zone,” except where the HPOZ chapter explicitly adds procedures or standards. § 18.58.06
• Key mandatory steps for establishing and administering an HPOZ include a certified historic resources survey, public notice/hearings, designation by ordinance, and recordation with County offices. § 18.58.10, § 18.58.12, § 18.58.12.I

(First time each related topic appears it is linked: Norco zoning, development standards, design review, parking, overlay districts, land use, ADUs, and the California Building Standards Code.)

District-by-district breakdown

Note: an HPOZ sits on top of the underlying zone; the HPOZ requires additional approvals but does not automatically change the underlying zone’s permitted uses or dimensional standards (see § 18.58.06) .

Historic Preservation Overlay Zone (HPOZ)

• Purpose: Protect and enhance buildings, structures, landscaping, natural features and areas of significance; protect settings; promote public education and economic benefits; ensure CEQA compliance. § 18.58.02
• Typical permitted uses: Uses follow the underlying zoning district; HPOZ does not create new use categories except procedural controls (designation, review). § 18.58.06
• Key procedural standards:
  • Historic resources survey prepared by a professional meeting Secretary of the Interior qualifications; the survey identifies contributing and noncontributing elements and establishes a period of significance. § 18.58.04; § 18.58.10.B
  • Concentration requirement: at least 50% of buildings in the proposed area must be certified as contributing for the HPOZ to qualify. § 18.58.10.C
  • Establishment can be initiated by the City or by a petition signed by 75% of property owners in the proposed area. § 18.58.10.A
  • Certificate of Appropriateness (COA) required for alterations to contributing elements and for new construction inside HPOZ—procedures reference Chapter 20.30 and include Historic Preservation Commission review (and in some cases the Planning Commission’s Architecture Review Subcommittee). § 18.58.14; § 18.58.16
  • Public hearings: Historic Preservation Commission recommendation → Planning Commission → City Council ordinance to designate HPOZ; designation recorded with the County Recorder and reflected on the City zoning map. § 18.58.12; § 18.58.12.H–I
• Where it applies: Any area determined to meet the HPOZ criteria and adopted by City Council ordinance; boundaries must reflect a concentration of contributing resources. § 18.58.10.D; § 18.58.12.H

R-1 (Single-family residential sub‑zones, e.g., R-1-10, R-1-15)

• Purpose: Stabilize and maintain residential character; subzones designate minimum lot sizes (numerical suffix equals thousands of square feet). § 18.15.02; § 18.15.04
• Typical permitted uses: Single‑family detached dwellings, parks, accessory buildings, home occupations, certain small-scale care uses. § 18.15.06
• Key dimensional standards (examples): Minimum lot sizes per numeric suffix (e.g., R-1-10 = 10,000 sq ft), front-yard/setbacks and other lot standards are specified in the R-1 chapter and Chapter 18.68 for accessory buildings — consult the underlying zone for specifics when an HPOZ applies. § 18.15.04; § 18.15.06
• Where HPOZ affects R‑1: Any COA or new-construction review required by HPOZ is applied in addition to R‑1 standards. § 18.58.06; § 18.58.14

A‑E (Agricultural‑Estate)

• Purpose: Maintain rural/equestrian character, agricultural estate living. § 18.12.02
• Typical permitted uses: Single‑family dwellings, accessory structures, agricultural uses (nurseries, orchards, etc.). § 18.12.06
• Key dimensional standards: Minimum lot area 1 acre or more for many areas; lot width/depth and coverage rules appear in the A‑E chapter (see Chapter 18.12). § 18.11.10–26 (related lot rules referenced)
• HPOZ interplay: HPOZ procedures (surveys, COAs) overlay A‑E rules; uses remain those in A‑E unless amended by ordinance. § 18.58.06

C‑4 and CG (Commercial districts — example development standards shown)

• Purpose and permitted uses: Each commercial zone chapter lists permitted commercial uses; where an HPOZ covers commercial blocks the COA and architectural review processes become critical. (See Chapter 18.23 for C‑4 and Chapter 18.29 for CG.) § 18.23.14; § 18.29.30
• Typical dimensional highlights (examples from code):
  • C‑4 front yard minimum 30 ft (modifiable under circumstances). § 18.23.14.A
  • CG minimum lot size 13,125 sq ft, building setback 25 ft, max height 35 ft (with CUP exceptions). See Table 2 in § 18.29.30.
• HPOZ interplay: New construction or façade changes to contributing commercial buildings require COA and follow architectural/site-plan review rules in Chapters 20.30 and 18.41. § 18.58.16; § 18.41.02

Most decision-relevant standards (quick reference table)

Checklist (what an applicant must submit / expect when working with a site in a proposed or adopted HPOZ)

• Engage a consultant who meets Secretary of the Interior professional qualifications to prepare a historic resources survey. § 18.58.10.B
• Prepare DPR inventory forms and a context statement establishing period of significance and identifying contributing elements. § 18.58.10.B.1–2
• If pursuing HPOZ formation, assemble owner petition evidence (if using petition route: 75% of property owners). § 18.58.10.A
• Apply for HPOZ designation on city forms, pay fees established by Council, and submit survey for certification by the Cultural Resources Administrator. § 18.58.12.A–B
• Expect public noticing and multiple public hearings (Historic Preservation Commission → Planning Commission → City Council). § 18.58.12.C–G
• For any work on a contributing element or new construction inside an HPOZ: obtain a Certificate of Appropriateness per Chapter 20.30 and follow architectural/site plan review content requirements. § 18.58.14; § 18.58.16; § 18.41.06
• Check whether the property is a registered historic resource (which affects landscaping and other exemptions). § 18.55.02.B.1

Risks & Ambiguities

Information Gaps

• Text of Chapter 20.30 (procedures/standards for Certificates of Appropriateness) — Not found in retrieved materials. Verify with City.
• Full text of Chapter 20.35 (preservation incentives) and Chapter 20.40 (enforcement/penalties) — Not found in retrieved materials. Verify with City.
• Parcel-level application of existing HPOZ boundaries (which blocks/addresses are currently designated) — Not found in retrieved materials; Verify with the jurisdiction and the City zoning map.

Plain-English Summary

If your property is inside a Norco Historic Preservation Overlay Zone (HPOZ) you must follow the overlay’s process: a certified historic survey defines which buildings are “contributing,” you will generally need a Certificate of Appropriateness for changes to contributing buildings or for new construction, and the underlying zone’s uses and dimensional rules still apply — but HPOZ review adds an approval step administered by the Historic Preservation Commission and the Cultural Resources Administrator. § 18.58.10–18.58.16

Source References

• Norco Municipal Code — Chapter 18.58: Historic Preservation Overlay Zone, including § 18.58.02, § 18.58.04, § 18.58.06, § 18.58.10, § 18.58.12, § 18.58.14, § 18.58.16, § 18.58.24–28, § 18.58.30.
• Norco Municipal Code — Chapter 18.41: Architectural Review (applicability, plan content, procedure). § 18.41.02; § 18.41.06; § 18.41.08; § 18.41.12.
• Norco Municipal Code — Exemptions for landscaping and registered historical sites, § 18.55.02.B.1.
• Representative underlying zone references (R‑1, A‑E, C‑4, CG) as cited in Chapters 18.11, 18.12, 18.15, 18.23, 18.29 for permitted uses and dimensional examples.

Retrieved passages

• Norco Zoning Code (§ 18.58.06.) High relevance show source text
• Norco Zoning Code (§ 18.58.12.) High relevance show source text
• Norco Zoning Code (§ 18.58.12.) High relevance show source text
• Norco Zoning Code (§ 18.58.04.) High relevance show source text
• Norco Zoning Code Medium relevance show source text
• Norco Zoning Code (§ 18.57.140.) Medium relevance show source text
• Norco Zoning Code (chapter and) Medium relevance show source text
• Norco Zoning Code (Chapter 18.41.) Medium relevance show source text

Cited sections

• Norco Municipal Code — **Chapter 18.58: Historic Preservation Overlay Zone**, including **§ 18.58.02**, **§ 18.58.04**, **§ 18.58.06**, **§ 18.58.10**, **§ 18.58.12**, **§ 18.58.14**, **§ 18.58.16**, **§ 18.58.24–28**, **§ 18.58.30**. (Chapter 18.58)
• Norco Municipal Code — **Chapter 18.41: Architectural Review** (applicability, plan content, procedure). **§ 18.41.02; § 18.41.06; § 18.41.08; § 18.41.12**. (Chapter 18.41)
• Norco Municipal Code — Exemptions for landscaping and registered historical sites, **§ 18.55.02.B.1**. (§ 18.55.02.B.1)
• Representative underlying zone references (R‑1, A‑E, C‑4, CG) as cited in Chapters **18.11**, **18.12**, **18.15**, **18.23**, **18.29** for permitted uses and dimensional examples.
• Norco_ZoningCode.md

• Official Norco code library