Local zoning · Gridley

Gridley — Nonconforming Uses

Q: Where are residential setback and yard rules that affect nonconforming lots?

Residential yard requirements for AR-5, R-S, R-1 , R-2 , R-3 , and R-4 appear in Chapter § 17.78.020 (front 20 ft , side yard = 20% of lot width with minimums, rear 5 ft ). These rules determine when a lot or setback condition is nonconforming. See § 17.78.020 .

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

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Last reviewed: July 2, 2026

Overview

This page explains how the City of Gridley treats nonconforming uses, nonconforming structures, and nonconforming lots under the Gridley Zoning Ordinance (Title 17). It synthesizes the rules for continuation, repair, enlargement, abandonment and reconstruction of nonconformities and shows how those rules interact with specific local districts (e.g., R-1, C-1, M-1). The rules summarized below are drawn from the Gridley zoning code; each rule is tied to the controlling code section so you can verify language and apply it to a parcel-specific situation. For project-level items such as building permits or compliance with the California Building Standards Code, see the linked resources below.

The City’s nonconformity rules are codified at § 17.03.010 – § 17.03.130 (Nonconformities) .
Definitions for nonconforming use and nonconforming structure appear at § 17.04.152 and § 17.04.154 .

(First mentions: "parking" links to the city parking page; "setbacks/development standards" links to development standards; "design review" links to design-review; "overlays" links to overlay-districts; "ADUs" and "California Building Standards Code" linked where discussed.)

Core nonconformity rules — plain structure, then citations

Purpose: allow continued operation but encourage elimination or conversion to conformity over time (intent). See § 17.03.010 .
What is a nonconformity: a use, building, structure or lot that was lawful when established but now fails to meet Title 17 standards (including lands annexed into the City that no longer meet zoning). See § 17.03.020 and definitions § 17.04.152 / § 17.04.154 .
Continuation: Nonconformities may continue but are subject to limits below; they are not free forever. See § 17.03.060 .
Enlargement/intensification prohibited except by City authorization (use permit). See § 17.03.070 .
Changing from one nonconforming use to another nonconforming use requires a Planning Commission conditional use permit. See § 17.03.080 .
Repairs/alterations: Normal maintenance allowed without entitlement, but structural alterations to nonconforming buildings require a conditional use permit; maintenance without entitlement is limited to 15% of replacement value per year. See § 17.03.090 .
Discontinuance/abandonment: Continuous discontinuance of a legal nonconforming use for one (1) year terminates rights (shorter timeframes apply to vacant parcels with only incidental structures). See § 17.03.110 .
Damage/destruction: If repairs cost ≤ 75% of replacement value, the building may be restored if started within one year; if > 75%, restoration and continuation of the nonconforming use requires a use permit and public hearing (Planning Commission). See § 17.03.120 .
Nuisance: If a nonconforming use or structure constitutes a public nuisance, it may be abated regardless of nonconforming status. See § 17.03.130 .

District-by-district breakdown (purpose, typical permitted uses, key dimensional standards, where it applies)

Note: Every district name and numeric standard below is bolded. The code references (§) following each district point link you to the local ordinance extract used for the summary.

R-1 — Single-Family Residential (17.22)

Purpose & where it applies: primary single-family neighborhoods; rules and subzones (R-1A, R-1B, R-1C) are in § 17.22.010 – § 17.22.110 .
Typical permitted uses: single-family dwellings and usual residential accessory uses (see the district chapter for full list) § 17.22.010 .
Key dimensional standards (decision-relevant):
- Maximum building height: 30 ft for principal building; 15 ft for accessory structures (see § 17.22.050) .
- Minimum lot width: 60 ft standard (corner lot and R-1A/B/C variations specified in § 17.22.060) .
- Maximum lot coverage: 40% (R-1 and R-1C) per § 17.22.070 .
- Yards / setbacks: residential yard rules (front 20 ft, side yard formula and minimums, rear 5 ft) apply from § 17.78.020 (see below) .

R-2 — Medium Density Residential (§ 17.25.010 – § 17.25.110)

Purpose & uses: medium-density housing and accessory residential uses; full permitted-use list in the R-2 chapter § 17.25 (use chapter) .
Key development rules: residential yard rules from § 17.78.020 apply (front 20 ft, side yard = 20% of lot width total min 5 ft) . (Specific R-2 numeric maxima/minima that are parcel-relevant should be verified in § 17.25 — Not found in the retrieved snippets; verify with the jurisdiction.) .

R-3 — Multiple-Family Residential (§ 17.26.010 – § 17.26.130)

Purpose: multifamily apartment development and related residential uses; permitted uses listed in the chapter (multiple-family units, SROs, etc.) § 17.26.020 .
Key dimensional standards:
- Maximum building height: 30 ft for residential structures; accessory 15 ft (§ 17.26.050) .
- Minimum lot width: 80 ft (fronting residential street) (§ 17.26.060) .
- Maximum lot coverage: 50% combined (residential, accessory, paved) (§ 17.26.070) .
- Yard rule reference: Chapter § 17.78 applies for setbacks (§ 17.26.080) .

R-4 — High Density Residential (§ 17.27.010 – § 17.27.130)

Purpose & uses: higher-density housing; see the R-4 chapter for permitted uses (§ 17.27) .
Key standards: Yards/setbacks are governed by Chapter § 17.78 (residential yard requirements); check § 17.27 for any R-4 specifics (not fully reproduced in the retrieved extracts). Verify with the City. .

AR-5 — Agricultural Residential (§ 17.12.010 – § 17.12.110)

Purpose: low-density residential with agricultural uses permitted in limited form (see chapter) § 17.12 .
Yards/setbacks: Chapter § 17.78 residential yard standards apply (front 20 ft, side yard formula, rear 5 ft) .

R-S — Residential Suburban (§ 17.21.010 – § 17.21.120)

Purpose: suburban residential patterns; chapter defines uses and standards § 17.21 .
Yards/setbacks: Chapter § 17.78 applies .

UR — Urban Reserve (§ 17.16.010 – § 17.16.020)

Purpose: land held in reserve for future urbanization; uses and conversion rules in § 17.16 (see chapter) .
Nonconformity note: when rezoned or brought into urban zoning, existing uses may become nonconforming — treat under § 17.03 .

O-S — Open Space (§ 17.14.010 – § 17.14.070)

Purpose: preservation of open space and limited public uses; consult § 17.14 for permitted uses and exceptions .

C-1 — Limited Commercial / Downtown (§ 17.32.010 – § 17.32.120)

Purpose: neighborhood and downtown commercial activity. See the C-1 chapter for permitted uses and downtown design expectations § 17.32 .
Key standards (decision-relevant):
- Maximum building height: commercial buildings 50 ft (some C-1 references), accessory 15 ft; front yard exceptions and side/rear yard rules when abutting R districts (see § 17.32.060 – § 17.32.070) .
- Lot coverage: up to 90% combined structures/paved area in C‑1 (§ 17.32.080) .
- Parking: Chapter § 17.76 applies; special downtown parking exceptions under the Special Parking Combining Zone § 17.58 (see below) .

C-2 — General Commercial (§ 17.34.010 – § 17.34.125)

Purpose: larger-scale commercial uses; permitted uses enumerated in Commercial Table (Chapter § 17.36) and C-2 specifics in § 17.34 .
Key standards:
- Building height: commercial buildings 50 ft; accessory 15 ft (§ 17.34.060) .
- Lot coverage: up to 90% (§ 17.34.080) .
- Parking: Chapter § 17.76; downtown Special Parking Combining Zone may alter requirements (§ 17.58) .

M-1 — Limited Industrial (§ 17.42.010 – § 17.42.040)

Purpose: preserve light industrial and heavy commercial uses not appropriate in commercial districts (§ 17.42.010) .
Permitted principal uses include manufacturing, assembly, light fabrication, warehouses, and related uses (§ 17.42.020) .
Dimensional standards and parking: see Chapter § 17.42 and off-street parking Chapter § 17.76 for details; conditional uses and accessory rules are in § 17.42 .

M-2 — Heavy Industrial (§ 17.44.010 – § 17.44.080)

Purpose: heavy industrial activities; permitted/conditional uses listed in the chapter § 17.44 .
Key standards:
- Max height: industrial buildings 65 ft; accessory 20 ft (§ 17.44.050) .
- Lot coverage: aggregate up to 80% (§ 17.44.070) .
- Yards: generally none, except where adjacent to residential zones (specific yard minima 20 ft side / 25 ft rear where abutting R) (§ 17.44.060) .

M-3 — Agricultural Industrial (§ 17.46.010 – § 17.46.090)

Purpose: agriculture-industrial uses (grain elevators, fruit dryers, greenhouse farming, research) (§ 17.46.020) .
Key standards: building height limits (65 ft) and lot coverage (80%) similar to M-2; yards rules when adjacent to residential parcels (§ 17.46) .

PD — Planned Development (§ 17.55.010 – § 17.55.140)

Purpose: flexible, project-specific standards tied to an approved site plan; underlying district still controls unless modified by the PD approval § 17.55.030–050 .
Nonconforming interaction: PD amendments or expirations may affect whether an existing use becomes nonconforming; consult § 17.55 and § 17.03 for interplay .

PQP — Public & Quasi-Public (§ 17.62.010 – § 17.62.090)

Purpose: public-service facilities (government buildings, utilities, schools, etc.). Permitted uses are listed in § 17.62.020; rules for emergency shelters and public uses in the chapter apply .

Combining & Overlay districts

Special Parking Combining Zones (SP): downtown and other special areas adjust parking requirements — see § 17.58 for the two SP zones (no on-site parking in SP-1 downtown; SP-2 special rules) .
Highway Commercial Corridor (HCC): combining zone that borrows uses and standards from multiple base zones; see § 17.59 for permitted uses and development standards (height 40 ft, lot coverage 80%, specific exclusions) .
Agricultural Overlay (AO): limited agricultural-support uses are allowed in overlay areas; consult § 17.56 for permitted, conditional uses and that AO-specific limits apply (§ 17.56.060–090) .

(Where a district-level numeric standard was not present in the retrieved snippets, the entry states "verify with the jurisdiction" below.)

Key rules table (decision-relevant items)

Topic	Rule summary	Code Reference
Definition of nonconformity	A building/use/lot lawful when created but now not in conformance	§ 17.03.020; definitions § 17.04.152/154
Continuation allowed but limited	Nonconformities may continue but city encourages abatement; limited maintenance vs structural changes	§ 17.03.010, § 17.03.060, § 17.03.090
Repair value limit	Annual repairs without entitlement limited to 15% of replacement value	§ 17.03.090(B)
Abandonment/discontinuance	Continuous discontinuance 1 year terminates rights	§ 17.03.110(A)
Destruction threshold	Repair allowed if ≤ 75% of replacement value; > 75% needs use permit	§ 17.03.120(A)-(B)
Change to another nonconforming use	Requires Planning Commission conditional use permit	§ 17.03.080
Enlargement/intensification	Prohibited except as allowed by § 17.03.110/use permit	§ 17.03.070
R-1 standards (height / lot coverage / front setback)	Max height 30 ft, accessory 15 ft; lot coverage 40%; front yard rule from Chapter 17.78 (front 20 ft)	§ 17.22.050, § 17.22.070, § 17.78.020
R-3 standards (height/lot coverage)	Max height 30 ft; lot coverage 50%; min lot width 80 ft	§ 17.26.050–070
C-2 commercial lot coverage	Up to 90% combined for structures and paved areas	§ 17.34.080
M-2 industrial height / yards	Max height 65 ft; yards generally none except where abutting R (side 20 ft, rear 25 ft)	§ 17.44.050–060
Special parking overlay	SP-1 (central business): no on-site parking requirement for non-residential uses	§ 17.58.020

Checklist — what an applicant must satisfy when a property involves a nonconformity

Confirm whether the existing use/structure/lot is a legal nonconformity (was lawful when established). See § 17.03.020 .
Determine whether proposed work is "maintenance" (allowed) or a "structural alteration" (may require a conditional use permit). See § 17.03.090 .
If changing a nonconforming use (to another nonconforming use) obtain a Planning Commission conditional use permit before the change. See § 17.03.080 .
If repair after damage: calculate replacement/repair cost; if > 75%, prepare a use permit application and environmental/permit justification. See § 17.03.120 .
For enlargement, intensification, or relocation of nonconformity, prepare materials for a Planning Commission hearing per § 17.03.100 and Chapter § 17.08 (Use Permits) .
Verify district-specific dimensional standards (setbacks, heights, lot coverage) in the applicable district chapter and in Chapter § 17.78 for residential setbacks before applying for permits; link to local development-standards. See § 17.78.020 for residential yard rules .
Obtain a certificate of zoning compliance and obtain required entitlements (no building permit without zoning compliance). See § 17.00.050 – 17.00.060 .
If the property sits in an overlay (e.g., SP, HCC, AO, PD), confirm overlay rules and whether they change parking or setback requirements. See § 17.58, § 17.59, § 17.56, § 17.55 .
For accessory dwelling units (ADUs) and conversions, check ADU rules and state ADU law interplay with nonconforming zoning (see linked ADU guidance). See state/ADU guidance and local ADU page. (Local ADU code specifics: Not found in the retrieved nonconformity snippets—verify with the City.) .

Risks & Ambiguities

Issue	Why it matters	What to verify
Is the use actually lawful when established?	Only lawful pre-existing uses get nonconforming protection; unlawful uses are nuisances and enforceable immediately	Confirm historic permits, business licenses, and building permit records; consult § 17.03.030 and § 17.00.070
Repair cost threshold (≤ or > 75%)	Crosses the line between automatic right to repair and required use-permit review	Get a qualified cost estimate and compare to replacement value; see § 17.03.120
Whether a proposed change is an "enlargement" or allowed intensification	Enlargement is prohibited unless the Planning Commission approves by use permit	Map proposed footprint and operations against § 17.03.070 and get pre-application meeting with Planning (verify via § 17.03.100)
Overlap with overlays or PDs	Overlay may override base district rules (e.g., parking exceptions)	Confirm overlay boundaries and PD approvals; see § 17.58, § 17.59, § 17.55
ADU permitting vs nonconforming zoning	State ADU law can limit a local agency’s ability to require correction of nonconforming zoning conditions	Verify ADU-specific provisions in local code and state ADU rules; see state ADU guidance (Not all ADU-nonconformity interactions are in the nonconformities chapter)
Parcel-specific historic conditions (substandard lots / pre-existing encroachments)	Some parcels were legal before updated standards; numeric yard/width exceptions may apply	Pull parcel history and check the applicable district chapter and § 17.78; verify with the Planning Department

Plain-English Summary

If a use or building in Gridley used to be legal but now breaks a newer zoning rule, the City lets it continue in most cases but limits changes: small repairs are OK, big changes or rebuilding after major damage usually trigger Planning review. If the owner stops the use for a year (or the city finds it abandoned), nonconforming rights end. See the nonconformity chapter § 17.03 for the full rules, and check the district chapter that applies to the property for setbacks and height rules (for example, R-1 specifics are at § 17.22) .

Source References

Gridley Zoning — Nonconformities (Title 17): § 17.03.010 – § 17.03.130
Definitions — Nonconforming structure / use: § 17.04.152, § 17.04.154
R-1 Single Family Residential: § 17.22.050 – § 17.22.080 (height, lot width, lot coverage)
Residential yard requirements (front/side/rear): § 17.78.020
R-3 Multifamily standards: § 17.26.050 – § 17.26.080 (height, lot coverage, lot width)
C-2 commercial standards (height, lot coverage): § 17.34.060 – § 17.34.080
M-2 industrial (height, yards): § 17.44.050 – § 17.44.060
M-1 limited industrial uses: § 17.42.010 – § 17.42.030
Planned Development (PD) rules: § 17.55.010 – § 17.55.050
Special Parking Combining Zone (SP): § 17.58.010 – § 17.58.030
Highway Commercial Corridor (HCC): § 17.59.010 – § 17.59.050
Agricultural Overlay (AO): § 17.56.010 – § 17.56.090
Certificate of zoning compliance; administration/enforcement: § 17.00.050 – § 17.00.070

Internal pages for related topics (first natural mention links):

Gridley zoning & planning overview: Gridley zoning & planning overview
Zoning (code chapters and map): Gridley Zoning
Development standards & setbacks: Gridley Development Standards
Parking rules: Gridley Parking
Design review: Gridley Design Review
Overlay districts: Gridley Overlay Districts
ADU guidance (state/local interplay): Gridley ADUs
California Building Standards Code (for building-permit interactions): California Building Standards Code

Sources

Retrieved passages

Gridley Zoning Code (§ 4) High relevance
Gridley Zoning Code (§ 5) High relevance
Gridley Zoning Code (§ 5) High relevance
Gridley Zoning Code (§1) High relevance
Gridley Zoning Code (Section 17.00.070.) High relevance
Gridley Zoning Code (section shall) High relevance
Gridley Zoning Code (section shall) Medium relevance
Gridley Zoning Code (§ 36) Medium relevance
Gridley Zoning Code (§ 3) Medium relevance
Gridley Zoning Code (§ 1) Medium relevance
Gridley Zoning Code Medium relevance
CBC § 66314 (§ 66314) Medium relevance
Gridley Zoning Code Medium relevance
Gridley Zoning Code (Chapter 22) Medium relevance
Gridley Zoning Code Medium relevance
Gridley Zoning Code (Section 17.36.010) Medium relevance
Gridley Zoning Code (§ 16) Medium relevance
Gridley Zoning Code Medium relevance
Gridley Zoning Code (Chapter 22) Medium relevance
Gridley Zoning Code Medium relevance
Gridley Zoning Code Medium relevance
Gridley Zoning Code Medium relevance
Gridley Zoning Code (Title 6) Medium relevance
California Residential Code Medium relevance
Gridley Zoning Code (§ 15) Medium relevance
California Residential Code Medium relevance
Gridley Zoning Code Medium relevance

Cited sections

Official Gridley code library

Frequently asked questions

What does Gridley’s code say about continuing a nonconforming use?

Gridley permits continuation of a lawful nonconforming use but controls changes: routine maintenance is allowed; structural alterations typically require a conditional use permit; enlargement or intensification is generally prohibited unless the Planning Commission authorizes it. See § 17.03.060, § 17.03.090, and § 17.03.070 .

If my nonconforming building is damaged in a fire, can I rebuild it?

Yes, but with limits: if repair/replacement of the damaged portion is ≤ 75% of the building’s pre-damage replacement value you may restore and reoccupy if restoration starts within one year and is diligently pursued; if repairs exceed 75%, you must obtain a use permit (Planning Commission review) to restore and continue the nonconforming use. See § 17.03.120(A)-(B) .

Can I change from one nonconforming use to another nonconforming use?

Not without approval. A change from one nonconforming use to another requires a Planning Commission conditional use permit issued before the change; otherwise the change may be treated as a code violation. See § 17.03.080 .

What happens if I stop operating my nonconforming business?

If a legal nonconforming use is discontinued for a continuous period of one (1) year, all nonconforming rights are terminated; for parcels with no buildings and only incidental structures the discontinuance period can be three (3) months per the code. See § 17.03.110 .

How much repair work can I do without triggering a use permit?

Normal, necessary maintenance is allowed; structural alterations require a conditional use permit. The code limits maintenance without entitlement to repairs not exceeding 15% of the replacement value of the building in any one year. See § 17.03.090 .

Do overlay zones like SP or HCC change nonconforming rules?

Overlay zones adjust development standards for affected parcels (parking, coverage, uses). They do not nullify nonconformity protections by themselves, but overlay rules may affect whether an existing condition is conforming. Check the overlay chapter (for SP see § 17.58, for HCC see § 17.59) and then apply § 17.03 to nonconforming matters. See § 17.58 and § 17.59 .

Where are residential setback and yard rules that affect nonconforming lots?

Residential yard requirements for AR-5, R-S, R-1, R-2, R-3, and R-4 appear in Chapter § 17.78.020 (front 20 ft, side yard = 20% of lot width with minimums, rear 5 ft). These rules determine when a lot or setback condition is nonconforming. See § 17.78.020 .

Can I get a permit to enlarge a nonconforming building or use?

Possibly—enlargement or intensification is generally prohibited unless the Planning Commission grants a use permit under the standards in § 17.03.100, and you must also satisfy the procedural/substantive requirements in Chapter § 17.08 for use permits. See § 17.03.070, § 17.03.100, § 17.08 .

If my lot is substandard (narrow or small), does that automatically make my lot nonconforming?

If the lot complied with regulations at the time it was created but now fails to meet current lot-area/width rules, it is classified as a nonconforming lot. The code treats conforming vs nonconforming lots under the nonconformity definitions and Chapter § 17.00 administrative provisions — confirm lot-specific status with Planning. See § 17.03.020 and Certificate of Zoning Compliance rules § 17.00.050 .

Do ADU applications interact with nonconforming zoning in Gridley?

State ADU law limits a local agency’s ability to deny ADUs on the basis of correcting nonconforming zoning conditions; Gridley local ADU details should be checked along with state ADU guidance. The City’s nonconformity chapter does not provide ADU-specific exceptions; verify with the Planning Department and the Gridley ADU page. See the state ADU guidance and local ADU rules (local specifics Not found in the nonconformity extracts) .

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