Local zoning · Chico

Chico — Nonconforming Uses

Q: What can I build on an R‑1 lot in Chico?

Most single‑family residential uses permitted in R‑1 include single‑family dwellings and accessory structures consistent with Table 4‑3C and Chapter 19.76; setbacks are typically 10 ft front , 5 ft side (with added offsets where abutting certain zones), and height 35 ft for primary structures — see § 19.42.040 and Table 4‑3C for the complete dimensional schedule.

Q: If my business stopped operating for 9 months, do I keep nonconforming status?

Possibly — the automatic loss rule applies at one continuous year of discontinuance; conversion to a conforming use at any time also ends nonconforming rights. If your gap is less than one year, document intent and continuity; see § 19.08.040.A .

Q: What happens if a nonconforming building is 60% destroyed in a fire?

If repair/replacement exceeds 50% of the structure’s total square footage, a use permit is required to authorize restoration and continuation of the use; the use permit must include a public‑benefit finding. For residential structures there are special replacement allowances; see § 19.08.040.B.2 .

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

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Last reviewed: July 1, 2026

Overview

Chico’s land-use rules treat nonconforming situations (uses, structures, parcels, and parking) as legal but temporary exceptions: they may continue under limits, may be changed only in specified ways, and can be lost by abandonment, destruction, or by specific amortization rules. The controlling local rules are in Chapter 19.08 of the Chico Land Use and Development Regulations; definitions and basic tests are in § 19.08.020 and the purpose is stated in § 19.08.010.

Note: this page stays strictly inside Chico zoning rules (Title 19) — for construction/structural code you must consult the California Building Standards Code and the City building department. The zoning rules frequently cross-refer to development standards and to parking; check the Chico Development Standards and Chico Parking pages when you apply these nonconforming rules.

Legal framework (what the Chico code says — short plain-English synthesis)

Definitions: a Nonconforming Use, Nonconforming Structure, Nonconforming Parcel, Nonconforming Site Improvements, and Nonconforming Parking Capacity are defined in § 19.08.020. The code explicitly treats parking capacity as a recognized nonconformity but prevents reducing existing parking capacity without approval.
Continuance and transfer: a lawful pre-existing nonconforming use may be continued, transferred or sold unless the nonconforming status is lost under the loss rules. See § 19.08.025.
Changes and expansions:
- The Director may authorize limited changes/substitutions/relocations of nonconforming uses via an administrative use permit; intensification/expansion requires a use permit (except certain single‑family residential additions). See § 19.08.025(B–C).
- Nonconforming structures may be maintained and repaired, may be seismically retrofitted or modified to meet legal safety requirements, and may be expanded only if the addition fully conforms to the code or if an administrative use permit is approved with findings (see § 19.08.030).
Loss of status:
- Abandonment/discontinuance for one continuous year terminates nonconforming rights; shorter discontinuance that was converted to a conforming use also terminates rights (§ 19.08.040.A.1–2).
- Damage/destruction: repairs are allowed if the damaged portion is ≤ 50% of the structure and restoration is started within 1 year and diligently pursued; if >50% is damaged a use permit is required (special rule: full replacement of residential structures is treated differently). See § 19.08.040.B.
Nonconforming parcels: a parcel that no longer meets access/area/width tests can still be a legal building site if it meets criteria (recorded subdivision, deed creation prior to the regulation, approved variance/lot line adjustment, or limited government acquisition). See § 19.08.050.
Other specific local rules: prior use permits, deemed‑approved alcoholic beverage regulations and local amortization rules (e.g., Chapman/Mulberry plan amortization timelines) are found elsewhere in Title 19 — read § 19.08.060–090 and Chapter 19.09 where applicable.

District-by-district practical breakdown

(For each district below: purpose, typical permitted uses, key dimensional standards, where it applies — the cited code text is the controlling source. For complete tables and nuanced lists of allowed uses consult Division IV / the zoning map and the specific district chapters referenced below.)

Notes about where to look in the code: zoning districts and their tables are in Division IV (Zoning Districts, Allowable Land Uses, and Zone‑Specific Standards). See the Zoning Map adoption rule and how district boundaries are interpreted in § 19.40.010 and the interpretation rules in § 19.02.020.

R‑1 (Single‑Family Residential)

Purpose: preserve low‑density single family neighborhoods and ensure compatibility with existing development; see the Residential Zone general standards and minimum lot area rules in the Residential Chapter.
Typical permitted uses: single‑family dwellings, accessory uses (garages, ADUs where allowed), small home occupations (see Division IV tables and Chapter 19.76 for accessory/limited uses).
Key dimensional standards: typical front setback 10 ft for main buildings (Table 4‑3C / residential standards), side yard 5 ft (with additional requirements when abutting RS or R1 zones), height typically 35 ft for main buildings; accessory structures have their own setbacks and height rules (see Table 4‑3C and Chapter 19.76). See § 19.42.040 and Table 4‑3C for the R‑zone schedule.
Where it applies: citywide residential areas defined on the official Zoning Map; consult § 19.40.030 for map adoption and interpretation.

RS (Suburban‑oriented Single Family)

Purpose & uses: like R‑1 but for lower density or larger‑lot suburban areas; standards for setbacks and site coverage reflect the larger lot orientation. See Table 4‑3C and § 19.42.040.

R3 / R4 / RMU (Higher‑density residential)

Purpose: multi‑family or higher density residential development, with rules for orientation, courtyard/open space and landscape standards. See Table 4‑3C and the multi‑family design subsections in Chapter 19.42 and 19.68. Key dimensional features: higher allowable density (e.g., up to 22–70 units/acre depending on district), reduced front setbacks in some cases, and maximum site coverage percentages.

CN (Neighborhood Commercial) and CC (Community Commercial)

Purpose: permit neighborhood‑serving retail and services, with design/compatibility standards where the zone abuts residential uses. See § 19.44.030 and Table 4‑7 for CN/CC development standards.
Typical uses: small retail, restaurants (with size thresholds), professional offices, personal services; many uses are subject to “P” (permitted) or “UP” (use permit) as shown in Division IV use tables.
Key dimensional standards: minimum lot sizes (CN interior 6,000 sq.ft.), side/rear setbacks depend on adjacency to residential (e.g., sides/rears can be 20 ft when abutting an R district), height typically 35 ft unless otherwise stated. See Table 4‑7 and notes.

DN (Downtown North)

Purpose: downtown commercial/office mix with special rules for live entertainment and alcoholic beverage uses (limitations on bars). See § 19.44.040 for DN district special standards.
Typical uses: higher‑intensity retail, restaurants, offices, mixed‑use development. Certain alcohol uses are tightly restricted (see DN special standards).
Key dimensional standards: many downtown development rules are in the DN chapter and downtown standards tables; building heights and coverage may be higher than suburban commercial. Consult Table 4‑7 and § 19.44.030.

CS / CR (Commercial Service / Regional Commercial)

Purpose: larger commercial/auto‑oriented and service uses; standards for setbacks and screening when abutting residential. See Table 4‑7 and the CR/CS notes in Division IV.
Key dimensional standards: larger site coverage allowances, greater height in corridor/downtown opportunity overlays, plus landscape buffers where adjoining residential.

M‑1 / M‑2 (Light / General Manufacturing & Industrial)

Purpose: manufacturing, light industrial, warehousing and supporting commercial; permitted uses and thresholds for hazardous processes are spelled out in the manufacturing chapter. See Chapter 19.46.
Typical uses: light manufacturing, research & development, indoor storage, with certain activities requiring a use permit. Height and setback rules are found in manufacturing chapter and in general development standards (Chapter 19.60).

Overlays and special areas

Overlay zones (for example -AO, -L, -VE, -FD, -PD) add rules that stack on top of the primary district; overlay rules can contain their own nonconforming provisions (for example the -AO airports overlay requires a use permit before replacing or increasing a nonconforming height) — see Chapter 19.52 and the specific overlay sections such as -AO rules. See § 19.52.040 and Table 4‑15.

Quick Reference table — most decision‑relevant nonconforming rules (short)

Topic	What Chico requires (plain English)	Code reference
Definition of nonconforming types	Nonconforming Use, Structure, Site Improvements, Parcels, Parking Capacity are defined and treated as legal nonconformities	§ 19.08.020
Continue / Transfer nonconforming use	May be continued/transferred unless status lost under loss rules	§ 19.08.025.A
Change, substitution, relocation	Director can allow substitution/relocation via Administrative Use Permit; intensification requires Use Permit	§ 19.08.025.B–C
Repairs / safety work	Maintenance, ordinary repairs, seismic retrofits and accessibility work allowed even if nonconforming	§ 19.08.030.A.1–2
Conforming expansion	Additions that fully comply with code are allowed	§ 19.08.030.A.3
Nonconforming expansion	Adds/extensions that increase nonconformity require an Administrative Use Permit and findings (adaptive reuse finding)	§ 19.08.030.A.4
Loss by discontinuance	Ceased for 1 year → rights terminate; conversion to conforming use also terminates rights	§ 19.08.040.A
Loss by destruction	Repairs allowed if ≤ 50% of sq.ft. restored within 1 year; >50% → use permit required; residential has special full‑replacement exception	§ 19.08.040.B
Nonconforming parcels	Parcel is legal if it meets subdivision record/deed/variance/lot‑line criteria	§ 19.08.050
Parking nonconformity	Existing off‑street parking can be legally nonconforming; parking capacity typically cannot be further reduced without approval	§ 19.08.020.F
Amortization (special local rule)	Certain nonconforming commercial/industrial uses (Chapman/Mulberry) were subject to amortization deadlines and extension procedures	Text in Chapter 19.09 and related local rules; consult the amortization text in Title 19 for details.

Checklist — what an applicant must satisfy to change, repair, or continue a nonconforming use/structure in Chico

Confirm the nonconforming status with historical evidence (permit, deed, business records) and document how the use/structure predates the controlling regulation — see § 19.08.020.
If making repairs only: ensure work is ordinary maintenance or required safety/Title 24 compliance (allowed by § 19.08.030.A.1–2). Link to the California Building Standards Code.
If modifying a nonconforming structure in a way that increases nonconformity: prepare an Administrative Use Permit application and demonstrate adaptive reuse / sustainable economic development finding required by § 19.08.030.A.4.
If expanding/intensifying a nonconforming use (commercial/industrial): prepare a Use Permit and address the findings in § 19.08.025.C (exceptions for single‑family residential additions apply).
If the nonconforming situation involves parking, include a parking analysis and any request for parking reduction in compliance with Chapter 19.70 and the nonconforming parking rules in § 19.08.020.F. Link to Chico Parking.
If property was annexed and nonconforming upon annexation, check annexation‑specific amortization windows and extension procedures (see Chapter 19.09 and amortization language).
If there was destruction or abandonment: document the percentage of damage and restoration schedule (≤50% repair started within 1 year → restoration allowed; >50% or 1+ year discontinuance → loss of rights or use permit required) — see § 19.08.040.B.
Verify whether the project triggers design review, planned development, or overlay rules; if it does, prepare materials per the Chico Design Review and Chico Overlay Districts provisions.

Risks & Ambiguities

Issue	Why it matters	What to verify
50% destruction test (repair threshold)	If repairs exceed 50% of original sq.ft., a Use Permit is required (and special findings apply). Mis‑measuring can illegally permit restoration.	Measure and document existing pre‑damage gross floor area; check § 19.08.040.B and get Director confirmation.
One‑year discontinuance rule	A nonconforming use that stops for one continuous year loses its status automatically.	Get written records of operation (business records, utility bills, tax returns) to prove continuity; see § 19.08.040.A.
Parking nonconformance	Parking is separately defined as a nonconformity but protected from arbitrary reductions.	Verify existing parking count, consult Chapter 19.70 and § 19.08.020.F; reductions typically require approval.
Annexation timing & amortization	Special amortization deadlines (e.g., Chapman/Mulberry) may have already expired or may require extensions via Planning Commission.	Confirm whether property was covered by the Chapman/Mulberry amortization rules and any extension filing deadlines; see the amortization text in Chapter 19.09 and local plan appendices.
Overlap with overlays / design review	Overlay zones sometimes impose stricter nonconforming rules (for example -AO prohibits increases in nonconforming height without a Use Permit).	Check applicable overlay chapter (Chapter 19.52) and the overlay’s nonconforming subsection before permitting replacement or alteration.
Is it “legal nonconforming” or unlawful?	Structures/uses that were never lawful are not protected; they are violations and may be subject to revocation procedures.	Confirm whether the pre‑existing use complied with the rules when established; unlawful cases are covered by § 19.08.080. If unsure, “Verify with the jurisdiction.”

Plain‑English Summary

If your building, business, parking, or lot in Chico was legal under older rules but doesn't meet today's zoning, Title 19 lets it continue in most cases — but with limits: routine repairs and Title 24 safety upgrades are allowed, small relocations or less‑intensive use substitutions can be approved administratively, larger expansions or intensifications usually need a use permit, and you can lose your nonconforming right if the use stops for a year or the structure is mostly destroyed (over 50%) without timely restoration. See the nonconforming chapter 19.08 for the precise tests and timelines.

Source References

City of Chico Land Use & Development Regulations, Chapter 19.08 (Nonconforming Structures, Uses, and Parcels): § 19.08.010 – § 19.08.090.
Repair, alteration and administrative-use rules for nonconforming structures: § 19.08.030.
Loss of nonconforming status (discontinuance & destruction rules): § 19.08.040.
Nonconforming parcels criteria: § 19.08.050.
Change / intensification of nonconforming uses: § 19.08.025.
Conformity of uses requiring use permits & previous permits: § 19.08.060 – § 19.08.070.
Deemed approved alcoholic beverage sale regulations and local amortization language (Chapman/Mulberry): Chapter 19.09 (see § 19.09.010 – § 19.09.040) for performance standards and amortization language.
Residential development standards and Table 4‑3C (residential zone general standards): § 19.42.040 / Table 4‑3C.
Commercial and office zone general development standards (Table 4‑7): § 19.44.030.
Manufacturing zone purpose and applicability: Chapter 19.46.
Overlay zone rules and nonconforming specifics (for example -AO): Chapter 19.52.
Nonconforming parking capacity definition (and linkage to Chapter 19.70 Parking): § 19.08.020.F and Chapter 19.70.

If you need the exact Division IV use table entry for a parcel (the allowed/conditional status of a specific use in a specific zone), consult the official Zoning Map together with Division IV tables and the code sections cited above; you may also request a zoning confirmation from the City’s Community Development Department.

Sources

Retrieved passages

Chico Zoning Code (Chapter 19.08) High relevance
CBC § 11 (Chapter 19.70) High relevance
Chico Zoning Code (Chapter 19.25) High relevance
CBC § 3 (Chapter 19.24) High relevance
Chico Zoning Code (§13) High relevance
Chico Zoning Code High relevance
Chico Zoning Code High relevance
Chico Zoning Code (§30) High relevance
Chico Zoning Code (Title 18) Medium relevance
Chico Zoning Code (Section 19.08.030) Medium relevance
Chico Zoning Code (§ 66333) Medium relevance
Chico Zoning Code (Section 19.40.010) Medium relevance
Chico Zoning Code (chapter provides) Medium relevance
CBC § 66321 (§ 66321) Medium relevance
Chico Zoning Code (Section 19.76.020) Medium relevance
Chico Zoning Code (§36) Medium relevance
CBC § 66314 (§ 66314) Medium relevance
California Residential Code Medium relevance
Chico Zoning Code (§13) Medium relevance
Chico Zoning Code (Section 19.76.020) Medium relevance
Chico Zoning Code (Section 19.76.020) Medium relevance
Chico Zoning Code Medium relevance
Chico Zoning Code Medium relevance
Chico Zoning Code High relevance
Chico Zoning Code (Chapter 19.24) High relevance
Chico Zoning Code (Title 18R.) Medium relevance
Chico Zoning Code (Chapter 1.14) Medium relevance
Chico Zoning Code (chapter as) Medium relevance
Chico Zoning Code (section shall) Medium relevance
Chico Zoning Code (chapter per) Medium relevance
Chico Zoning Code (Chapter 2.80.) Medium relevance

Cited sections

Official Chico code library

Frequently asked questions

What can I build on an R‑1 lot in Chico?

Most single‑family residential uses permitted in R‑1 include single‑family dwellings and accessory structures consistent with Table 4‑3C and Chapter 19.76; setbacks are typically 10 ft front, 5 ft side (with added offsets where abutting certain zones), and height 35 ft for primary structures — see § 19.42.040 and Table 4‑3C for the complete dimensional schedule.

What are Chico setback requirements for residential and commercial zones?

Setbacks are district‑specific and summarized in the district development tables (e.g., Table 4‑3C for residential and Table 4‑7 for commercial). Typical single‑family front setback is 10 ft (R zones) and commercial front setbacks vary (CN may require none except where block abuts an R district). See § 19.42.040 and § 19.44.030 and the associated tables.

Do I need design review to alter a nonconforming building?

It depends. Nonconforming repairs and required safety work are allowed, but alterations that affect exterior design or are within districts or overlays that require architectural review may trigger Design Review under Chapter 19.18. Where a change increases nonconformity you may need an administrative use permit or a use permit — check § 19.08.030 and consult the Chico Design Review procedures.

Can I expand a nonconforming commercial use?

Not automatically. A nonconforming commercial/industrial use cannot be expanded as a matter of right — intensification or expansion requires a use permit under § 19.08.025.C; smaller substitutions/relocations may be allowed administratively under § 19.08.025.B.

If my business stopped operating for 9 months, do I keep nonconforming status?

Possibly — the automatic loss rule applies at one continuous year of discontinuance; conversion to a conforming use at any time also ends nonconforming rights. If your gap is less than one year, document intent and continuity; see § 19.08.040.A.

What happens if a nonconforming building is 60% destroyed in a fire?

If repair/replacement exceeds 50% of the structure’s total square footage, a use permit is required to authorize restoration and continuation of the use; the use permit must include a public‑benefit finding. For residential structures there are special replacement allowances; see § 19.08.040.B.2.

Are parking shortages on old sites treated as nonconforming?

Yes — existing off‑street parking capacity established prior to the code is recognized as nonconforming parking capacity and generally cannot be reduced unless approved by the City (Chapter 19.70 and § 19.08.020.F). Consult the Chico Parking standards when preparing a submittal.

Do overlay zones change how nonconforming items are handled?

Yes. Some overlays (for example the airport -AO overlay) add their own nonconforming controls (e.g., requiring a use permit before replacing or increasing a nonconforming height) — always check the applicable overlay chapter in Chapter 19.52 in addition to the base district rules.

Can I convert a nonconforming lot to conforming by splitting it?

Where structures already exist on a nonconforming parcel, the code forbids dividing the area where structures are located in any way that reduces building site area, setbacks, or frontage below the applicable district’s requirements — see § 19.08.050. If you need a different lot pattern, consider a variance or lot line adjustment procedures.

If a prior use had a use permit that expired, is the nonconforming use protected?

A use established by a prior use permit continues only in compliance with the terms of that original permit; if the prior permit had a termination date the use ends in accordance with that permit. See § 19.08.070 for previous use permit rules.

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