Norco — Nonconforming Uses

Last reviewed: July 2, 2026

Overview

This page summarizes how the City of Norco treats nonconforming uses, nonconforming structures, and nonconforming lots under the local zoning ordinance (Title 18 use chapters and related zone chapters). It synthesizes the rules on continuation, repair, enlargement, abandonment, restoration after damage, and amortization periods, and shows where those rules interact with specific districts such as A-1, A-2, the HDO (Housing Development Overlay), and the Hospitality (HD) zone. All rules below are grounded in the Norco Zoning Code; see the cited § references for the controlling text.

What Norco's ordinance says (core rules)

• Definition and purpose: A non‑conforming use is one that was lawful before the current ordinance but is no longer permitted; the ordinance treats these as incompatible with current permitted uses and limits their expansion. § 18.39.06.

• Continuation and maintenance:

  • A lawful non‑conforming use or structure may be continued and maintained subject to limits. § 18.39.04(1)–(2).
  • Ordinary repairs are allowed, but repairs requiring a building permit that exceed 10% of current replacement cost are not allowed for nonconforming structures. § 18.39.04(3).
  • If a non‑conforming structure becomes unsafe and is declared unsafe by an authorized official, it cannot be restored except in conformity with current zone requirements. § 18.39.04(4).
  • Exception for parking: a single‑family residence that is nonconforming only because of parking may be enlarged or moved on the lot without being required to add a garage provided adequate on‑site parking remains. § 18.39.04(5).

• Enlargement, relocation, and discontinuance:

  • A non‑conforming use shall not be enlarged, altered, or moved to another portion of the lot unless approved by a conditional use permit. § 18.39.06(1).
  • If a non‑conforming use is discontinued for 180 days or more, it loses its legal non‑conforming status (i.e., it cannot be resumed as a nonconforming use). § 18.39.06(2).

• Non‑conforming structures:

  • A non‑conforming structure is a lawfully existing building that no longer complies with current area, height, setback, parking or similar structure rules; it may remain in the same use but any enlargement/alteration/move must comply with the current zone regulations. § 18.39.08.

• Restoration after damage:

  • If a non‑conforming structure or use is damaged/destroyed to 50% or less of value, it may be rebuilt and the nonconformity can be resumed (rebuilt work must be started within one year). § 18.39.10 (A and general rule).
  • If damage exceeds 50%, rebuilding and resumption of a nonconforming use is generally prohibited unless a set of criteria are met (including building permit timing, type of zone/use, size limits, proof of prior lawful construction, and compliance with current building code standards). § 18.39.10 (A–E).

• Amortization (time limits to phase out uses/conditions):

  • The City sets specific amortization periods depending on replacement value and the condition at issue (examples: under $2,000 — 1 year; more than $2,000 but no single structure > $2,000 — 5 years). There are special rules for service stations, signs, and certain driveway surfacing in the A‑1 zone. § 18.39.12.

• Cross‑references and zone application:

  • When a new overlay or zone (for example HDO or HD) is adopted, pre‑existing lawful uses, lots and structures that do not meet the new standards are expressly declared nonconforming and are governed by Chapter 18.39. § 18.64.12 (HDO) and § 18.63.10 (HD).

District-by-district (how nonconformity plays out in specific Norco zones)

Note: below each district heading names the actual Norco zone designation in bold. Where the city code text for permitted uses, dimensional standards, or intent is present in retrieved materials, I cite the controlling §; where a specific numeric standard or explicit list was not found in the retrieved excerpts, I state "Not found in retrieved materials" so you can Verify with the jurisdiction.

A-1 (Agricultural Zone)

• Purpose / where to look: standards and permitted/agricultural uses are in Chapter 18.14 (A‑1 zone). § 18.14.x passages include lot size, yards, heights and coverage. § 18.14.10, § 18.14.16, § 18.14.18, § 18.14.20 are the key dimensional rules quoted in the code excerpts.
• Typical permitted uses: agricultural production, commercial riding/training/boarding stables, accessory agricultural structures, limited farm‑product stands, and other similar agricultural uses (numerous enumerated uses appear within the A‑1 chapter). See the A‑1 use listings in Chapter 18.14.
• Key dimensional standards (from retrieved text): minimum lot area generally at least 5 acres (see § 18.14.10); front yard 25 ft, side yard 20 ft, rear yard 30 ft (§ 18.14.16); maximum height 35 ft (generally 2.5 stories) (§ 18.14.18); maximum lot coverage 40% (§ 18.14.20).
• Nonconforming specifics: existing agricultural uses/lots/structures that do not meet A‑1 standards are subject to Chapter 18.39 nonconforming rules (continuation, amortization, restoration rules). For example, special amortization rules apply to certain driveway surfacing in A‑1; see § 18.39.12(e).

A-2 (Agricultural‑Residential / equestrian‑oriented zone)

• Purpose / where to look: see Chapter 18.13 for A‑2 rules; the code includes lot/pad minimums and equestrian/animal keeping requirements. § 18.13.10, § 18.13.11.
• Typical permitted uses: residential with accessory animal‑keeping and equestrian facilities (detailed animal unit tables and PAKA requirements are in the chapter).
• Key dimensional standards: minimum lot area and pad area rules are in § 18.13.10–12; PAKA sizing and setbacks are specified (PAKA minimum sizes and 35‑ft setback from adjacent habitable structures, etc.). § 18.13.11 (A–D).
• Nonconforming specifics: mobile homes and other pre‑existing conditions can be treated as nonconforming per Chapter 18.39; animal‑keeping rules in commercial/industrial zones reference nonconforming residential or agricultural uses as the basis to allow animal keeping in otherwise non‑permitted zones. § 18.35.08, § 18.35.10 refer to this cross‑link.

HDO (Housing Development Overlay Zone)

• Purpose: the HDO is intended to encourage affordable housing while respecting Norco’s equestrian character. § 18.64.02.
• Typical permitted uses: residential development at specified densities and supportive housing types; non‑residential uses are allowed only after required residential density is met (see § 18.64.06–12).
• Key dimensional standards / where to look: HDO site plans and density bonus rules are in § 18.64.10 and associated HDO sections; existing development inconsistent with HDO standards is explicitly declared nonconforming and governed by Chapter 18.39 (§ 18.64.12).

Hospitality Development Zone (HD or “Hospitality Development Zone” / Chapter 18.63)

• Purpose: coordinated commercial/tourist development with buffering and equestrian sensitivity. § 18.63.02.
• Typical permitted uses: hotels, motels, full‑service restaurants, mixed commercial/recreational projects — permitted subject to a specific plan. § 18.63.06.
• Key dimensional standards: where a specific plan is not adopted, HD uses C‑G (Chapter 18.29) standards by reference (§ 18.63.08). Existing development inconsistent with HD standards is nonconforming and governed by Chapter 18.39 (§ 18.63.10).

C‑G (Commercial – General) and Manufacturing / Industrial zones

• Purpose and standards: C‑G standards are collected in Chapter 18.29 (not fully reproduced in the retrieved excerpts). Hospitality zones default to C‑G standards when the specific plan does not address an item. § 18.63.08.
• Nonconforming specifics: rules in Chapter 18.39 apply to pre‑existing uses/structures/lots when the current C‑G/manufacturing standards would otherwise make them nonconforming (see cross references in Chapters 18.35, 18.29 and Chapter 18.39). § 18.35.10 notes animal‑keeping in manufacturing zones may be permitted only in connection with legally nonconforming agricultural or residential uses.

Residential zones (general)

• Where to look: general rules that apply across residential zones include recorded‑lot rules and continuation/repair rules. § 18.30.16 (lots recorded) lets previously recorded nonconforming lots be used as building sites, subject to development standards; continuation and repair rules for nonconforming structures apply under § 18.39.04.
• ADUs interaction: Norco’s nonconforming zoning rules are silent on ADU‑specific preemption in the retrieved materials; consult state ADU law for limits on conditioning ADUs based on nonconforming zoning conditions. Verify with the jurisdiction; see State ADU guidance. Not found in retrieved materials for municipal ADU‑nonconformance specifics.

Quick reference table — Most decision‑relevant nonconforming standards

Practical guidance (plain‑English synthesis and interactions)

• If you believe your property or use is nonconforming, start by documenting the prior lawful status (permits, recorded deeds, historical use). The code requires evidence to determine legal nonconforming status in some restoration cases. § 18.39.10(E).
• Don't assume you can rebuild after a major fire — the 50% threshold is decisive: if damage exceeds 50% of the structure's value, special criteria apply before the nonconforming use or structure can be resumed. § 18.39.10.
• Small repairs are allowed, but once repairs requiring a permit exceed 10% of current replacement cost you run into limitations (you may be required to bring the work into conformance). § 18.39.04(3).
• If you intend to expand or move a nonconforming use on the lot, plan on applying for a conditional use permit; the Planning Commission’s discretionary review is the path the code requires. § 18.39.06(1).
• For residential projects involving ADUs, Norco’s nonconforming rules in the retrieved materials do not explicitly override state ADU protections. Verify with planning staff because California law restricts conditioning ADUs on the correction of nonconforming zoning conditions in many cases. See state guidance. Not found in retrieved materials for local ADU‑specific limits.

Inline links to related Norco topics you will commonly need while dealing with nonconforming situations:

• For vehicle and visitor space implications, check parking rules.
• For literal yard and setback figures, consult Norco Development Standards.
• If change or design questions are involved, see design review procedures.
• Overlays can create new nonconformities — review Norco Overlay Districts.
• ADU proposals may touch nonconforming zoning — read Norco ADUs and the state ruleset California ADU law.
• Where building permits are required or restoration is considered, the California Building Standards Code is applicable for construction standards (this page does not replace Title 24 review).

Checklist (what an applicant should prepare before contacting Norco Planning)

• Confirm whether the use or structure was lawful when established (collect prior permits, deeds, tax records) — required for many restoration tests (§ 18.39.10(E)).
• Determine whether the nonconforming use has been discontinued for 180 days (if so, status lost) — check occupancy/operation records (§ 18.39.06(2)).
• Estimate current replacement cost of the structure to test the 10% repair threshold and the 50% damage rebuild threshold; obtain a Building Official estimate if necessary (§ 18.39.04(3); § 18.39.10).
• If enlarging/changing a nonconforming use, prepare a Conditional Use Permit application and neighborhood compatibility materials (§ 18.39.06(1)).
• Check whether a zone change or overlay (HDO, HD) has been applied to the parcel; if so, identify how Chapter 18.39 treats existing development (§ 18.64.12, § 18.63.10).
• For projects involving housing or accessory units, verify applicable state ADU provisions and whether local nonconforming zoning conditions can be required to be corrected (state law interaction). Not found in retrieved materials for local ADU limits — verify with Norco planning.

Risks & Ambiguities

Plain‑English summary

If your Norco property was legal under older rules but now fails a current zoning rule, it is a "nonconforming" use/structure/lot and can usually remain, but there are strict limits: you generally cannot expand or move the use without a conditional use permit, major repairs and rebuilding after heavy damage are limited, abandonment for 180 days ends the status, and some nonconformities must be removed by amortization deadlines — see Chapter 18.39 for the controlling rules. § 18.39.04–12.

Source References

• § 18.39.02 Intent and Purpose — General provisions on nonconforming uses/structures/lots.
• § 18.39.04 Continuation and Maintenance (repairs, 10% rule, unsafe structure).
• § 18.39.06 Non‑Conforming Uses (no enlargement without CUP; 180‑day discontinuance).
• § 18.39.08 Non‑Conforming Structures (definition and limits).
• § 18.39.10 Restoration of a Damaged Structure (≤50% and >50% rules; rebuild criteria).
• § 18.39.12 Amortization of Non‑Conforming Uses (timelines and special cases).
• § 18.14.10, § 18.14.16, § 18.14.18, § 18.14.20 — A‑1 zone lot area, yards, heights, coverage (A‑1 standards referenced above).
• § 18.13.10–12, § 18.13.11 — A‑2 zone lot/pad area and Primary Animal Keeping Area (PAKA) rules.
• § 18.64.12 — HDO existing development declared nonconforming and governed by Chapter 18.39.
• § 18.63.10 — Hospitality (HD) existing development declared nonconforming and governed by Chapter 18.39.
• § 18.35.08, § 18.35.10 — Animal‑keeping in commercial/manufacturing zones allowed only when tied to legally nonconforming agricultural/residential uses.
• Norco Zoning & planning overview (site pages referenced for internal navigation and related topic pages): use the in‑text links to access Norco’s pages on parking, development standards, design review, overlay districts, ADUs, and California Building Standards Code. (Internal links supplied in the body.)

Retrieved passages

• CBC § 18.39.06 (§ 18.39.06.) High relevance show source text
• CBC § 18.39.10 (§ 18.39.10.) High relevance show source text
• Norco Zoning Code (§ 18.38.30.) High relevance show source text
• Norco Zoning Code (Section 18.39.18) High relevance show source text
• Norco Zoning Code (§ 18.64.10.) High relevance show source text
• Norco Zoning Code (§ 18.14.08.) Medium relevance show source text
• Norco Zoning Code (§ 18.30.08.) Medium relevance show source text
• Norco Zoning Code (Chapter 18.63.) Medium relevance show source text

Cited sections

• **§ 18.39.02** Intent and Purpose — General provisions on nonconforming uses/structures/lots. (§ 18.39.02)
• **§ 18.39.04** Continuation and Maintenance (repairs, 10% rule, unsafe structure). (§ 18.39.04)
• **§ 18.39.06** Non‑Conforming Uses (no enlargement without CUP; 180‑day discontinuance). (§ 18.39.06)
• **§ 18.39.08** Non‑Conforming Structures (definition and limits). (§ 18.39.08)
• **§ 18.39.10** Restoration of a Damaged Structure (≤50% and >50% rules; rebuild criteria). (§ 18.39.10)
• **§ 18.39.12** Amortization of Non‑Conforming Uses (timelines and special cases). (§ 18.39.12)
• **§ 18.14.10**, **§ 18.14.16**, **§ 18.14.18**, **§ 18.14.20** — A‑1 zone lot area, yards, heights, coverage (A‑1 standards referenced above). (§ 18.14.10)
• **§ 18.13.10–12**, **§ 18.13.11** — A‑2 zone lot/pad area and Primary Animal Keeping Area (PAKA) rules. (§ 18.13.10)
• **§ 18.64.12** — HDO existing development declared nonconforming and governed by Chapter **18.39**. (§ 18.64.12)
• **§ 18.63.10** — Hospitality (HD) existing development declared nonconforming and governed by Chapter **18.39**. (§ 18.63.10)
• **§ 18.35.08**, **§ 18.35.10** — Animal‑keeping in commercial/manufacturing zones allowed only when tied to legally nonconforming agricultural/residential uses. (§ 18.35.08)
• Norco Zoning & planning overview (site pages referenced for internal navigation and related topic pages): use the in‑text links to access Norco’s pages on **parking**, **development standards**, **design review**, **overlay districts**, **ADUs**, and **California Building Standards Code**. (Internal links supplied in the body.)
• Norco_ZoningCode.md
• 2025 California ADU handbook.md

• Official Norco code library