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Local zoning · Chico

Chico — Nonconforming Uses

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

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Quick answer

In Chico, a lawful nonconforming use may continue; switching to a same-or-less-intense use or relocating within a building needs an Administrative Use Permit, while any intensification/expansion needs a Use Permit (§ 19.08.025). Existing parking shortfalls are recognized, but projects adding demand for 3+ spaces must meet current standards (§ 19.01.050(D)). Undersized lots can still be legal sites if public acquisition reduced size by ≤ 20% and a street yard by ≤ 50% (§ 19.08.050).

Last reviewed: July 25, 2026 · AI-generated analysis · General information, not legal advice · details

Compiled from Chico's adopted code with AI research tools and grounded in the sources cited below. Verify with Chico planning staff before relying on it.

Overview

Chico regulates “legal nonconforming” situations in Title 19, Chapter 19.08 of its zoning regulations. In plain terms, uses that were lawful when established may continue under tight conditions, and any change, expansion, or intensification is carefully controlled. The City’s policy goal is to discourage and ultimately eliminate nonconformities over time while allowing limited continuance and carefully reviewed adjustments (§ 19.08.010, § 19.08.025, § 19.08.060). For broader context on districts and standards, see the Chico zoning & planning overview and Chico Zoning.

A lawful use that no longer matches today’s zoning may continue, but changing it to anything more intense needs approval; substitutions or relocations within a building can be approved only if the new activity is of the same or lesser intensity (§ 19.08.025).

What counts as a “nonconforming use” in Chico

  • A nonconforming use is a land use or use of a structure that was legally established before current regulations and doesn’t match what’s allowable for the site’s zoning today (§ 19.08.020(A)).
  • Related nonconformities include nonconforming structures, site improvements (e.g., older parking/landscaping layouts), parcels, and parking capacity deficiencies recognized as legally nonconforming (§ 19.08.020(B)–(F)).

Core rules you’ll actually use

Continuing, changing, moving, or intensifying a nonconforming use

  • Continue/transfer/sell: Allowed so long as nonconforming status is not lost under the City’s loss-of-status rules (see § 19.08.040, referenced in § 19.08.025(A)). Verify with the jurisdiction.
  • Substitute to a same-or-less-intense use: Possible with an Administrative Use Permit if the Director finds the new use is of the same or lesser intensity (e.g., fewer employees, reduced floor area/hours) (§ 19.08.025(B)).
  • Relocate within the same structure: Also handled by Administrative Use Permit with the same “same-or-less-intensity” finding (§ 19.08.025(B)).
  • Intensify/expand the use: Possible only with a Use Permit from the Zoning Administrator or Commission (§ 19.08.025(C)).
    • Exception: A conforming addition to a nonconforming single-family residential use is not treated as an “intensification” (§ 19.08.025(C)).

Interplay with nonconforming structures and site improvements

  • Maintenance/repair that does not increase the degree of nonconformity is allowed (§ 19.08.030(A)(1)).
  • Safety/code compliance work (e.g., seismic retrofit) is allowed; Title 24 life-safety upgrades may proceed (§ 19.08.030(A)(2)). For state code background, see the California Building Standards Code.
  • Conforming expansions of a nonconforming structure/site improvement are allowed (§ 19.08.030(A)(3)). Check relevant Chico Development Standards.
  • Nonconforming changes to such structures/site improvements can be approved with an Administrative Use Permit only if it is an adaptive reuse that promotes sustainable economic development, and the new work may not exceed the existing structure’s height or push further into setbacks than comparable existing portions (§ 19.08.030(A)(4)). Exterior changes may also trigger Chico Design Review.

Uses deemed conforming when a use permit would now be required

  • A use that existed when the code changed—and is now allowed only with a use permit—is deemed a conforming use despite lacking that permit, but only to the extent it previously existed (including the same site boundaries and hours) (§ 19.08.060). Any expansion or intensification must follow the change/intensification procedures above (§ 19.08.060).

Previously issued use permits

  • If a use exists by virtue of an older use permit and it is no longer allowable by use permit under today’s regulations, it may continue only under the original permit’s terms (including any termination date) (§ 19.08.070).
  • If the formerly permitted use is now an allowed use by right, the old use permit is deemed rescinded (§ 19.08.070).

Illegal uses and nuisances

  • Structures/uses that were never legal are violations, have no right to continue, and are subject to revocation/abatement; all required entitlements must be obtained to lawfully continue (§ 19.08.080).
  • A legal nonconforming use or structure that is a public nuisance may be abated under the City’s nuisance rules (§ 19.08.090).

Parking and intensity triggers

  • A site’s lawful, older parking supply is recognized as nonconforming parking capacity; it is not, by itself, a reason to label the land use nonconforming (§ 19.08.020(F)).
  • You generally may not reduce an already nonconforming parking supply unless approved for a reduction/alternative under Chapter 19.70 (Chico Parking) (§ 19.08.020(F)).
  • Any alteration/expansion that increases the required parking by three or more spaces must meet applicable standards in Title 19 (§ 19.01.050(D)).

Nonconforming parcels (how lot status affects use approvals)

A lot that doesn’t meet today’s area/width/access standards may still be a legal building site if it fits one of the criteria below (§ 19.08.050). This often controls whether a nonconforming use can lawfully continue or be adjusted on that parcel. For setbacks, coverage, and height, see Chico Development Standards.

How a substandard lot can still be a legal building site Key conditions Code Reference
Approved subdivision Created by recorded subdivision map or certificate of compliance § 19.08.050(A)
Legally created by deed Lot was legally created by recorded deed before the regulation that made it nonconforming § 19.08.050(B)
Variance or lot line adjustment Approved via variance (see Chico Variances and Exceptions) or by a Title 18-compliant lot line adjustment § 19.08.050(C)
Partial government acquisition Lot became nonconforming due to a public acquisition that reduced lot size by ≤ 20% and reduced any street-facing yard by ≤ 50% § 19.08.050(D)

Additional guardrails: Where structures already exist on a nonconforming parcel, you cannot further divide the developed area in ways that push site conditions (building site area, setbacks, frontage) farther from compliance or make the use more nonconforming (§ 19.08.050, last paragraph).

Agreements with the City

A use existing under a City–owner agreement that no longer complies with current provisions may not continue beyond the agreement’s terms, including any clause ending the use upon adoption of Title 19 or future amendments (§ 19.48.090).

Citywide applicability and “minimum requirement” rule

  • Title 19 applies to all land uses and development in the City; new uses/structures must be allowed in the applicable zoning district and meet all standards and approvals (§ 19.01.050(A)).
  • When interpreting the code, provisions are minimum requirements unless labeled otherwise (§ 19.02.020(F)).
  • For unlisted uses, the Director may interpret them as equivalent to listed uses if specific findings are made (§ 19.02.020).

District-by-district applicability to nonconforming uses

Chico’s nonconforming use rules in Chapter 19.08 apply across all zoning districts identified in Division IV, not just residential or commercial areas (§ 19.01.050, § 19.08.010). Use permissions by district are set in the land use tables; nonconforming status is measured against those permissions.

Residential zoning districts (Table 4-2)

  • Purpose/typical uses/dimensional standards: Not found in source materials.
  • Decision anchor: Whether a residential use today is permitted, conditionally permitted, or prohibited is determined in Table 4-2 (§ 19.42.020). Nonconforming status arises when a lawfully established residential use no longer aligns with those permissions.
  • Where it applies: All residential districts included in Table 4-2 (§ 19.42.020). For supplemental standards, see Chico Development Standards.

Commercial/office zoning districts (Table 4-6)

  • Purpose/typical uses/dimensional standards: Not found in source materials.
  • Decision anchor: Whether a commercial/office use is permitted today is determined in Table 4-6 (§ 19.44.020). If your established use no longer matches that table, it is nonconforming unless deemed conforming under § 19.08.060.
  • Where it applies: All office and commercial districts listed in Table 4-6 (§ 19.44.020).

Other zones and overlays

  • Other districts and Chico Overlay Districts may impose additional constraints; overlay-specific preservation/design rules (e.g., Chico Historic Preservation) can affect exterior changes even when the land use is nonconforming. Verify overlay applicability for your parcel.

Permits and findings at a glance

Action with a nonconforming situation Permit path Key limits/findings Code Reference
Continue/transfer/sell a nonconforming use None (by right) Allowed unless status has been lost; see loss-of-status rules § 19.08.025(A) (see § 19.08.040)
Substitute to same-or-less-intense use Administrative Use Permit Director must find same or lesser intensity; examples: fewer employees, smaller floor area, reduced hours § 19.08.025(B)
Relocate nonconforming use within the same structure Administrative Use Permit Same-or-less-intensity finding required § 19.08.025(B)
Intensify or expand the nonconforming use Use Permit Decided by Zoning Administrator/Commission; conforming addition to a nonconforming SFR is not intensification § 19.08.025(C)
Maintain/repair nonconforming structure None (by right) Cannot increase degree of nonconformity § 19.08.030(A)(1)
Safety/code compliance retrofit None (by right) Limited to required life-safety/code compliance scope § 19.08.030(A)(2)
Conforming expansion of nonconforming structure/site improvements None (by right) Must fully meet current standards; may still need Chico Design Review as applicable § 19.08.030(A)(3)
Nonconforming change to structure/site improvements Administrative Use Permit Adaptive reuse; promotes sustainable economic development; no added height or further setback encroachment § 19.08.030(A)(4)
Existing use now “use-permit only” Deemed conforming (to extent previously existed) Same site boundaries and hours; any expansion/intensification follows § 19.08.025 paths § 19.08.060
Reduce already nonconforming parking Parking reduction approval No further reduction unless approved under Chapter 19.70 (Chico Parking) § 19.08.020(F)
Project that adds parking demand Meet current Title 19 standards Triggered if required parking increases by ≥ 3 spaces § 19.01.050(D)

Checklist

  • Confirm the use, structure, site improvements, or parcel was lawfully established before current rules (§ 19.08.020).
  • Verify nonconforming status has not been lost (see § 19.08.040; Not found in source materials). Verify with the jurisdiction.
  • Identify your path: continue, substitute/relocate (AUP), or intensify/expand (UP) (§ 19.08.025).
  • If substituting/relocating, prepare evidence that the proposal is of the same or lesser intensity (staffing, floor area, hours) (§ 19.08.025(B)).
  • If expanding a nonconforming structure/site improvement nonconformingly, document adaptive reuse benefits and ensure no height increase or deeper setback encroachment (§ 19.08.030(A)(4)).
  • Check if the existing use is now “use-permit-only”; if so, it may be deemed conforming only to its historic footprint and hours (§ 19.08.060).
  • Evaluate parking: do not further reduce nonconforming parking without approval; if the project increases required parking by ≥ 3 spaces, Title 19 standards apply (§ 19.08.020(F), § 19.01.050(D); see Chico Parking).
  • Confirm lot status if substandard; see criteria for legal building sites (§ 19.08.050) and any needed relief via Chico Variances and Exceptions).
  • Screen for overlays/historic areas that add design limits despite nonconforming status (Chico Overlay Districts, Chico Historic Preservation).
  • Coordinate any exterior work with Chico Design Review where applicable.

Risks & Ambiguities

Issue Why it matters What to verify
Loss of nonconforming status details Rights may have lapsed due to discontinuance or damage thresholds The specific standards of § 19.08.040 are not in source materials; verify with the jurisdiction
“Same or lesser intensity” finding Determines whether an AUP can approve a substitution/relocation Evidence of employees, floor area, storage, and hours that show reduced intensity (§ 19.08.025(B))
“Intensification” vs. conforming SFR additions Controls whether a Use Permit is required Whether the addition fully conforms to current standards so it’s not deemed an intensification (§ 19.08.025(C))
Nonconforming changes to structures Requires adaptive reuse and economic development findings That the project qualifies as adaptive reuse and meets height/setback no-worsening limits (§ 19.08.030(A)(4))
Deemed-conforming “use-permit-only” uses Expansion beyond historic footprint/hours loses deemed status Historic site boundaries/hours and how the proposed change affects intensity (§ 19.08.060)
Parking reductions on nonconforming sites Unapproved reductions can bar permits or trigger corrections Need for a parking reduction/alternative per Chapter 19.70; 3-space increase trigger (§ 19.08.020(F), § 19.01.050(D))
Prior agreements An agreement clause may force termination Whether § 19.48.090 applies to the property and the agreement’s terms
Overlay and historic constraints Nonconforming status doesn’t waive overlay design/historic rules Overlay maps/standards and design review applicability

Plain-English Summary

If your Chico property hosts a lawful but now-disallowed use, you can generally keep operating. To switch to a different use of the same or lesser intensity—or to move the use within the same building—you’ll need an Administrative Use Permit. Growing or intensifying the use usually takes a Use Permit, and any structural work can’t make setbacks or height nonconformities worse. Older parking shortfalls are recognized, but adding activity that needs three or more new spaces triggers current standards.

Information Gaps

  • Specific district names (e.g., R-1, C-N), purposes, and dimensional standards: Not found in source materials.
  • Detailed criteria for “Loss of nonconforming status” (§ 19.08.040): Not found in source materials.
  • Which exterior changes trigger design review by district or overlay: Not found in source materials.

Source References

  • § 19.01.050 Applicability of these Regulations
  • § 19.02.020 Similar uses; minimum requirements
  • § 19.08.010 Purpose (nonconforming structures, uses, and parcels)
  • § 19.08.020 Definitions (nonconforming uses/structures/site improvements/parcels/parking)
  • § 19.08.025 Nonconforming uses (continuance, substitution/relocation via AUP, intensification via UP)
  • § 19.08.030 Nonconforming structures and site improvements (maintenance, safety, conforming expansion, AUP for adaptive reuse; height/setback no-worsening)
  • § 19.08.050 Nonconforming parcels (legal building site criteria and limits)
  • § 19.08.060 Conformity of uses requiring use permits (deemed conforming to extent existed)
  • § 19.08.070 Previous use permits in effect
  • § 19.08.080 Unlawful structures and uses (violations; no right to continue)
  • § 19.08.090 Nuisance abatement
  • § 19.42.020 Residential zone land uses and permit requirements (Table 4-2)
  • § 19.44.020 Commercial/office zone land uses and permit requirements (Table 4-6)
  • § 19.48.090 Nonconforming uses under prior agreements

Sources

Source passages

  • Chico Zoning Code (§ 19.08.025) Medium relevance
  • Chico Zoning Code (§ 19.08.060) Medium relevance
  • Chico Zoning Code (§ 19.01.050) Medium relevance
  • Chico Zoning Code (§ 19.08.050) Medium relevance
  • Chico Zoning Code (§ 19.08.010) Medium relevance
  • Chico Zoning Code (§ 19.08.020) Medium relevance
  • Chico Zoning Code (§ 19.08.070) Medium relevance
  • Chico Zoning Code (§ 19.02.020) Medium relevance
  • Chico Zoning Code (§ 19.42.020) Medium relevance
  • Chico Zoning Code (§ 19.08.080) Medium relevance
  • CBC § 030 (§ 19.08.030) Medium relevance
  • Chico Zoning Code (§ 19.08.090) Medium relevance
  • Chico Zoning Code (§ 19.44.020) Medium relevance
  • Chico Zoning Code (§ 19.48.090) Medium relevance

Cited sections

Frequently asked questions

Can I change a nonconforming retail use to a different shop type in Chico?

Yes—if the new use is of the same or lesser intensity, the Planning Director can approve it with an Administrative Use Permit, and must make a specific “same or lesser intensity” finding (e.g., fewer employees, reduced floor area or hours) (§ 19.08.025(B)).

Can I expand a nonconforming use on my site?

Possibly, but intensification or expansion requires a Use Permit from the Zoning Administrator or Commission. A conforming addition to a nonconforming single-family residence is not considered an intensification (§ 19.08.025(C)).

My use was allowed without a permit, but now the code says it needs a use permit. Am I illegal?

No. It is deemed conforming to the extent it previously existed (same site boundaries and hours). Any expansion or intensification must follow the change/intensification procedures in § 19.08.025 (§ 19.08.060).

Can I reduce existing parking on a nonconforming site?

Generally no. A site with nonconforming parking capacity may not reduce parking further unless you obtain an approved parking reduction or alternative under Chapter 19.70. If your project increases required parking by three or more spaces, current standards apply (§ 19.08.020(F), § 19.01.050(D)).

What if my lot is undersized for the zoning district?

It may still be a legal building site if it meets one of the criteria in § 19.08.050 (e.g., created by recorded subdivision map, legally created deed lot, variance/lot line adjustment, or partial public acquisition with size reduced ≤ 20% and street-facing yard reduced ≤ 50%).

Do I need design review to modify a nonconforming building?

Design review may still apply to exterior changes; nonconforming status does not waive it. The code allows certain repairs/safety upgrades by right and conforming expansions, but other exterior changes may need approvals and design review; verify applicability for your project (§ 19.08.030).

What happens to a use operating under a prior agreement with the City?

It cannot continue beyond the terms of the agreement, including any clause terminating the use upon adoption of Title 19 or an amendment (§ 19.48.090).

Are illegal uses protected as nonconforming?

No. Uses or structures that were never compliant are violations and have no right to continue; they are subject to revocation and enforcement until required entitlements are obtained (§ 19.08.080).

General information, not legal advice.

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