Local zoning · Arcadia

Arcadia — Nonconforming Uses

Nonconforming Uses under the Arcadia local zoning and planning code, with the controlling citations.

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Last reviewed: July 3, 2026

Overview

This page explains how the City of Arcadia's Development Code treats nonconforming uses, nonconforming structures, and nonconforming lots. It summarizes the rules that determine when a pre‑existing use or building keeps protected status, what changes are allowed, and the triggers that terminate nonconforming rights, with direct pointers to the controlling City code provisions (Article IX, Division 6). See the City's rules on parking, development standards, design review, overlay districts, and ADUs for related review steps that often come up during a nonconformity application.

Key legal groundwork (short)

  • The nonconforming rules are in Division 6, Article IX (Development Code) — especially § 9106.01.010, § 9106.03.010–.040, § 9106.05.010–.050, § 9106.05.030, and § 9106.07.010–.020. These establish intent, continuation, modification limits, destruction/rebuild rules, and lot rules.

How Arcadia's Development Code treats nonconformities (plain synthesis)

  • Protected status begins at the effective date that created the nonconformity (adoption/amendment or map change) and the property owner must prove the legal nonconforming claim to the Director. § 9106.01.020; burden of proof rules require the owner to submit evidence and the Director's determination is appealable.

  • Continuation vs termination:

    • Nonconforming uses may continue indefinitely in many cases, but there are specific limits: residential nonconforming uses in residential zones can be maintained (but expansions typically require a Modification), whereas commercial/industrial nonconforming uses must not be enlarged. See § 9106.03.010 and § 9106.03.030.
    • If a nonconforming use or structure is discontinued or abandoned for 180 consecutive days, the nonconforming right is lost and any future use must conform to the Development Code. § 9106.03.040; § 9106.05.050.

  • Modifications and expansions:

    • A nonconforming use or structure generally may not be expanded, extended, or intensified beyond its existing scope, except for narrow exceptions (minor repairs, changes required by other law, or Director‑approved small additions on single‑family lots via a Modification). § 9106.03.030; § 9106.05.020.

  • Damage or destruction:

    • A nonconforming structure damaged by an involuntary event may be rebuilt only if repairs do not exceed 75% of appraised value (otherwise the structure must be brought into conformance). Time limits for reconstruction and appraisal rules are in § 9106.05.030 and the Residential exceptions are in § 9106.05.040.

  • Nonconforming lots:

    • A legally created lot that becomes nonconforming as to area, frontage, width, depth, or accessibility may continue and be developed as if it were conforming, but the lot may not be modified to increase its nonconformity; lot merger / lot line adjustments are encouraged to reduce nonconformity. § 9106.07.010–.020.

  • Special categories:

    • Nonconforming animal keeping must be terminated or made conforming within three years after the date it became nonconforming. § 9106.03.010.C.
    • Parking, landscaping, fences, and DBS antennas each have tailored nonconforming rules (e.g., parking nonconformities continue but any change/expansion requires bringing additional parking into compliance). See § 9106.09.020–.040 and related development code sections on parking.

District-by-district breakdown (where nonconforming rules matter)

Below are the main Arcadia base zones where nonconforming rules are most commonly applied. For each zone I list purpose/typical uses, then the key dimensional standards the Development Code uses (as background when evaluating what is nonconforming). If a precise numeric standard could not be located for a particular item in the retrieved materials, the line states "Not found in retrieved materials" and you must Verify with the jurisdiction.

  • R-M (Residential Mountainous)

    • Purpose / typical uses: large-lot, low‑density single‑family residential and estate uses implementing the General Plan's Residential Estate designation. See Table 1‑1 for zone list and purpose.
    • Key dimensional standards (decision‑relevant): minimum front setback: variable (see Subsection 9102.01.040); side setbacks: R‑M interior side ~15 ft or 20% of lot width; maximum stories: 2; accessory structure height max 16 ft; pool setbacks: not within front yard; 5 ft from side/rear. These standards are in Subsections addressing single‑family development and accessory standards (Table 2‑5 and 9102.01.040).

  • R-1 (Single‑Family Residential)

    • Purpose / typical uses: conventional single‑family neighborhoods (multiple R‑1 lot sizes exist e.g., R‑1 7,500, R‑1 10,000, etc.). See Table 1‑1 for the different R‑1 suffixes.
    • Key dimensional standards: front setback: commonly 25 ft (see 9102.01.030/040); interior side setback: typically 10 ft or 20% of lot width; lot coverage for 1‑story: 45% / 2‑story: 35%; max stories: 2; accessory structure floor area limit 50% of main building footprint (Table 2‑5). See Subsection 9102.01.030, Table 2‑5.

  • R-0 (Large Lot/Very Low Density)

    • Purpose / typical uses: larger lots/estate residential with larger setbacks and lower densities. See Table 1‑1.
    • Key dimensional standards: front/side/rear setbacks generally larger than R‑1 (see Subsection 9102.01.040). Specific numeric variations by R‑0 subcategory are in the Development Standards tables. Verify parcel‑specific setback numbers with the Code tables.

  • R-2 / R-3 (Multifamily residential zones)

    • Purpose / typical uses: R‑2 medium density apartments/duplexes; R‑3 higher density multifamily. See Table 1‑1.
    • Key dimensional standards: front setback commonly 25 ft, interior side 10 ft, minimum open space per unit 100 sq ft, maximum height R‑3 often 30 ft, density limits (units/acre specifics are in § 9102.01.100 and Table 2‑?). Note: nonconforming residential structures in R‑3 are treated tightly — the Code requires conformance when new construction occurs on the lot, though limited exceptions (e.g., 500 sq ft cumulative additions) exist via a Modification; see § 9106.05.020.D and § 9106.05.020.D.2.

  • C-R (Regional Commercial)

    • Purpose / typical uses: large shopping centers and regional retail/mixed commercial uses. See Table 1‑1 and the C‑R development standards.
    • Key dimensional standards: maximum height: 85 ft (with H8 Overlay exceptions); setbacks vary — see Table 2‑9; limits on non‑retail uses within centers (non‑retail capped at 20% gross leasable area in regional centers per Subsection 9102.03.050). Nonconforming encroachments into setbacks in commercial zones may be required to be removed when expansions exceed 50% of floor area. § 9106.05.020; § 9102.03.050.

  • M-1 (Industrial)

    • Purpose / typical uses: industrial/manufacturing, light industrial and some supporting commercial functions. See Table 1‑1 and Table 2‑9 for permitted uses.
    • Key dimensional standards: minimum lot area: e.g., 15,000 sq ft in some M‑1 categories, maximum height 35 ft (see Table 2‑9/9102.03.030) and off‑street parking/perimeter landscaping requirements. Nonconforming industrial uses are generally allowed to continue but may not be enlarged; outdoor storage/display/trash must be made conforming when an expansion occurs. § 9106.03.010.B, § 9106.05.020.A.5.

Notes:

  • These zone summaries draw on the Development Code Tables and Subsections for Development Standards and Allowed Uses (Divisions 2 and 3). For parcel‑specific numeric standards (e.g., the exact front setback for a particular R‑1 subzone or the H overlay exceptions), check the corresponding zone table rows in Division 2 (Table 2‑5, Table 2‑9, Subsections 9102.01.030, 9102.01.040, 9102.03.030). If a specific numeric value isn't cited above as found in the retrieved materials, Verify with the jurisdiction.

Most decision‑relevant rules — quick table

Rule / standard What it means in practice Code reference / where to read it
Legal nonconforming start date The effective date of the ordinance or zoning map amendment that created the nonconformity determines protected status § 9106.01.020
Owner must prove status Property owner carries burden to show a use/structure/lot is legal nonconforming; Director issues determination (appealable) § 9106.01.020.B
No expansion rule Nonconforming uses/structures may not be extended or enlarged beyond their pre‑existing scope except for limited exceptions § 9106.03.030; § 9106.05.020
180‑day abandonment rule If a nonconforming use ceases for 180 consecutive days, the protection ends and future uses must conform § 9106.03.040.A; § 9106.05.050.A
Destruction rebuild threshold If involuntary damage repair/replacement cost exceeds 75% of appraised value, the structure cannot be restored as nonconforming § 9106.05.030.A–B
Nonconforming lot continuation Lawful lots that become substandard may continue to be used/developed as if conforming, but may not be further modified to worsen nonconformity § 9106.07.010–.020
Animal‑keeping special rule Nonconforming animal keeping must be terminated or conformed within 3 years § 9106.03.010.C
Parking nonconformity Parking shortfalls may continue but additional parking for any change/expansion must meet current parking rules § 9106.09.040 and Section 9103.07 on parking

Checklist (what an applicant must satisfy to retain/modify a nonconformity)

  • Document the historic lawful status (dates, permits, prior approvals) and submit evidence to the Director (owner has burden of proof). § 9106.01.020.B.
  • Confirm the nonconforming category (use, structure, or lot) and the precise scope/date of the nonconformity. § 9106.01.020.
  • Avoid enlarging or intensifying scope unless the change fits a stated exception (minor repairs, modifications required by law, Director‑approved small additions or a Modification per Division 7). § 9106.03.030; § 9106.05.020.
  • If proposing an addition/alteration, show new portions comply with current Development Code rules or obtain a Modification/discretionary permit. § 9106.05.020.B–C.
  • If the structure suffered involuntary damage, obtain appraisal and Building Official review to determine whether reconstruction is allowed under the 75% rule; start reconstruction within required timeframes. § 9106.05.030.
  • For changes affecting parking, landscaping, trash, or outdoor display, include plans showing compliance with the current Development Code (these are trigger points for bringing the site into conformity). § 9106.05.020.A.5; § 9106.09.030–.040.
  • Consider whether design review or overlay requirements apply (e.g., Architectural Design overlay) and route applications per Site Plan & Design Review procedures. See 9107.19 and overlay rules.

Risks & Ambiguities

Issue Why it matters What to verify
Is the prior use “lawful”? Only lawful prior uses get protected nonconforming status; illegal/unpermitted past work may not be protected Collect permits, business licenses, dated photos; be prepared for Director to require proof. § 9106.01.020.B
Abandonment vs temporary closure Loss of rights after 180 days can be triggered unintentionally (e.g., COVID closures) Verify continuous operation evidence (receipts, utilities). If listed for sale, different rules apply (see exemptions). § 9106.03.040
Extent of allowed “minor” repairs Ambiguous term — Director discretion creates risk on what is considered a qualifying minor repair Show engineering or cost breakdown; request written Director interpretation (appealable). § 9106.03.030.A.2
Rebuilding after damage: appraised value disputes The 75% threshold requires a licensed appraiser and Building Official confirmation; disputes delay projects Obtain a licensed appraisal early and coordinate with Building Official about acceptable repair estimates. § 9106.05.030.C
Changing to a conforming use and then back Conversion to a conforming use permanently ends the nonconforming right Decide carefully before converting; there is no reversion to nonconformance. § 9106.03.010.D
Parcel‑specific numeric standards (setbacks/FAR) Different R‑1/R‑0/R‑M suffixes and overlays change numeric standards; quoting the wrong number can derail approvals Verify zone suffix and overlay on the official zoning map and consult the precise Development Standards table rows (e.g., Table 2‑5, Table 2‑9). If uncertain, Verify with the jurisdiction.

Plain‑English summary (for a homeowner)

If your house, business, or lot stopped meeting a rule because the City later changed the rules, Arcadia usually lets that prior use or building keep going — but you cannot expand it, and if you stop using it for more than about six months or you rebuild after heavy damage (over a 75% cost threshold), the nonconforming protection can end. The property owner must prove the nonconforming status and any changes beyond small repairs typically require a Modification or other discretionary approval. § 9106.01.010–.060; § 9106.03; § 9106.05.

Source References

  • City of Arcadia Development Code, Division 6 (Nonconforming Uses, Structures and Lots) — § 9106.01.010 et seq. (Intent; Establishment; Continuation; Proof; Revocation).
  • Arcadia Development Code — § 9106.03.010–.040 (Continuation, eligible permits, modification limits, discontinuance).
  • Arcadia Development Code — § 9106.05.010–.060 (Nonconforming structures; modifications; destruction/rebuild rules; discontinuance).
  • Arcadia Development Code — § 9106.07.010–.020 (Nonconforming lots).
  • Arcadia Development Code — § 9106.09.020–.040 (Fencing, landscaping, parking nonconformities, other miscellaneous).
  • Table 2‑5 (Accessory structure development standards R‑M, R‑0, R‑1) and Table 2‑9 (Commercial/Industrial development standards) — see Division 2 Development Standards (Subsections 9102.01.030, 9102.01.040, 9102.03.030).

Useful related City pages (internal links referenced above):

  • Arcadia zoning & planning overview (/us/california/arcadia) — linked where the Development Code title is introduced.
  • Arcadia Zoning (/us/california/arcadia/zoning) — consult for official zone map and zone suffixes.
  • Arcadia Land Use (/us/california/arcadia/land-use) — for permitted uses tables.
  • Arcadia Development Standards (/us/california/arcadia/development-standards) — regulations that determine when a structure is nonconforming.
  • Arcadia Parking (/us/california/arcadia/parking) — parking nonconformity rules tie into nonconforming uses.
  • Arcadia Design Review (/us/california/arcadia/design-review) — many nonconforming changes need design review.
  • Arcadia Overlay Districts (/us/california/arcadia/overlay-districts) — overlays (e.g., Architectural Design, H special height) can change which standards control.
  • Arcadia ADUs (/us/california/arcadia/adu) — special ADU rules interact with nonconforming zoning conditions.
  • California Building Standards Code (/us/california/building-codes) — reconstruction after damage must meet current building code requirements (referenced in § 9106.05.030).

Sources

Retrieved passages

  • Arcadia Zoning Code (Section 9106.03) High relevance
  • Arcadia Zoning Code (Section 9108.09) High relevance
  • Arcadia Zoning Code (Section 9106.05) High relevance
  • Arcadia Zoning Code (Section 9108.07) High relevance
  • Arcadia Zoning Code (Article IX) High relevance
  • Arcadia Zoning Code (Section 9108.07) High relevance
  • Arcadia Zoning Code (Section 9106.05) High relevance
  • Arcadia Zoning Code High relevance
  • Arcadia Zoning Code High relevance
  • Arcadia Zoning Code High relevance
  • Arcadia Zoning Code Medium relevance
  • Arcadia Zoning Code (Section 9108.07) Medium relevance
  • CBC § 1 (Chapter are) Medium relevance
  • Arcadia Zoning Code Medium relevance
  • Arcadia Zoning Code Medium relevance
  • Arcadia Zoning Code (CHAPTER 1.) Medium relevance
  • Arcadia Zoning Code Medium relevance
  • Arcadia Zoning Code (§ 4) Medium relevance

Cited sections

Frequently asked questions

What counts as a legal nonconforming use in Arcadia?

A legal nonconforming use is a use, structure, or lot that was lawful when created but no longer complies because of a later code change; the owner must prove the status to the Director. The Development Code establishes the time of beginning for nonconformity (ordinance effective date or map amendment) and places the burden of proof on the owner. § 9106.01.020.

Can I expand a nonconforming business in Arcadia?

Generally no — nonconforming commercial or industrial uses may not be enlarged, altered, or intensified beyond their existing scope, except for limited exceptions (minor repairs, lawful changes required by other laws, or specific Director/Modification approvals). § 9106.03.030; § 9106.05.020.

If my nonconforming use stops for a while, when is the right lost?

If a legal nonconforming use ceases or is discontinued for 180 consecutive days or more, protection ends and future use must conform to current code; maintenance of a business license alone does not count as continuation. § 9106.03.040.A.

If my building is 60% destroyed in a fire, can I rebuild it as it was?

If involuntary damage repair/replace costs do not exceed 75% of the structure's appraised value immediately before the damage, you may restore it (subject to building code compliance and start/finish timeframe rules); if costs exceed 75%, you must bring the new structure into compliance. § 9106.05.030.A–B.

Do nonconforming lots get treated differently from nonconforming structures?

Yes. A lawfully created lot that becomes substandard may continue to be used and developed as if conforming (i.e., it retains nonconforming lot status indefinitely), but you cannot change it in a way that increases the nonconformity — lot mergers or lot line adjustments are encouraged to reduce nonconformance. § 9106.07.010–.020.

How does Arcadia treat nonconforming fences, landscaping, or parking?

Legally established nonconforming fencing and landscaping may continue; however, replacement fencing must meet current prohibited materials rules and required landscaping/parking shortfalls generally must be corrected if you expand or intensify the site. Parking nonconformities may continue until a change/expansion triggers full compliance with Section 9103.07. § 9106.09.020–.040.

Can a nonconforming residential structure add rooms or units?

Additions to nonconforming residential structures are allowed only if the new portions comply with current Development Code regulations or if a Modification is approved; an increase in the number of residential units in a nonconforming residential structure is prohibited. § 9106.05.020.B–C.

Does getting a conforming permit for part of a site let me keep the rest nonconforming?

No — when a nonconformity is eliminated or brought into conformance, the nonconforming rights related to that feature are terminated and cannot be restored. § 9106.01.060.

If my nonconforming condition arose because of a City map amendment, when does the nonconformity start?

The effective date of the Zoning Map amendment determines the time of beginning of the nonconformity; annexations similarly fix the start date. § 9106.01.020.A.2–3.

Do ADU permits get denied because of nonconforming zoning conditions on the lot?

Arcadia's ADU rules follow state requirements: the City will not deny an ADU permit solely because of a nonconforming zoning condition, building code violation, or an unpermitted structure so long as the condition does not threaten health/safety and is not affected by the ADU construction (see local ADU subsection). Verify details in the ADU rules. Subsection 9102.01.080 (ADUs). ---

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