Local zoning · Gridley

Gridley — Overlay Districts

Overlay Districts 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 Gridley’s municipal zoning ordinance treats overlay and combining districts that modify base zoning. It summarizes the actual Gridley code rules for the Agricultural Overlay (AO), the Special Parking Combining Zones (SP), and the Planned Development (PD) combining district, with practical notes for applicants. All requirements below are drawn from the Gridley zoning ordinance; citations show the controlling code sections (§) and the retrieved ordinance file.

Note: for site-level questions about setbacks, parking counts, or ADU compatibility consult the specific code sections below and Verify with the jurisdiction.

(Links: first natural mentions)

District-by-district breakdown

AO — Agricultural Overlay District

  • Purpose: The AO district is a secondary/overlay designation intended to allow continued commercial agricultural production on parcels that are otherwise planned for eventual urban uses, until those urban uses develop (§ 17.56.010) (intent).
  • Where it applies: The AO may be applied as a secondary zoning designation to properties with no habitable structures or to portions of partially developed parcels that average no more than two residences per five gross acres; the minimum gross area for an AO district is five (5) acres (§ 17.56.020).
  • How it interacts with base zoning: For properties carrying the AO secondary designation, AO regulations modify or supersede the primary zoning — permitted uses on an AO parcel are only those allowed in the AO until the AO is removed via a rezoning/zone amendment (§ 17.56.030) .
  • Typical permitted principal uses: Commercial production agriculture is primary; one single‑family dwelling unit per lot is allowed if it meets foundation and installation rules specified in the code (referenced within the AO rules) (§ 17.56.040).
  • Accessory and conditional uses: Limited accessory uses (e.g., on‑site wholesale/retail of products produced there, processing such as hulling/drying) are allowed but limited to a small portion of the AO area; conditional uses such as greenhouses and commercial livestock raising may be allowed with a use permit (§ 17.56.050–.060).
  • Other controls: Fence and signage are governed by the general provisions in Chapter 17.72; there is a fee waiver for applications to establish the AO zone (§ 17.56.070–.090) — check Chapter 17.72 for the specific fence/sign rules referenced.

Practical note: If your parcel is labeled R‑1/AO (or similar), the AO may block most urban uses until removed. Removal requires a formal zoning amendment under Chapter 17.06. Verify parcel mapping and whether portions of a lot can be split out of AO before designing a project.

SP — Special Parking Combining Zones (two numbered zones)

  • Purpose: The SP combining zones provide parking flexibility for defined downtown/central areas and older small lots where standard on‑site parking rules would be harsh (§ 17.58.010).
  • Special Parking Combining Zone Number 1 (central business/downtown):
    • Where it applies: non‑residential zoning districts located west of Haskell Street (§ 17.58.020.A).
    • Key rule: No on‑site parking requirement for non‑residential uses within SP‑1; residential parking still must follow the residential standard in the code (§ 17.58.020.B–C).
  • Special Parking Combining Zone Number 2 (Downtown residential area):
    • Where it applies: the area bounded by Locust Street (S), Butte Water District Lateral No. 8 (N), West Biggs‑Gridley Road (W), and State Highway 99 (E) (§ 17.58.030.A).
    • Key exceptions: residential spaces need not be covered by a garage, and tandem parking is permitted in SP‑2; otherwise Chapter 17.76 parking standards apply with these exceptions (§ 17.58.030.B).

Practical note: If your site falls inside SP‑1 or SP‑2, you can often avoid building new surface or structured parking that would otherwise be required. Confirm lot lines and the city’s overlay map before final design. See the City’s downtown parking map via the city planning office.

PD — Planned Development District (combining district)

  • Purpose and applicability: The PD district is a flexible, combining district intended to allow site‑specific modifications of the zoning code where the PD’s concept plan is consistent with the General Plan; the PD may be applied as a combining zone to any City zoning designation (§ 17.55.010–.020) .
  • Permitted uses and standards: Permitted uses in a PD are those arranged to conform with the General Plan and the approved development plan; the PD process lets the City alter or authorize deviations from otherwise applicable standards including setbacks, height, sign requirements, building coverage, off‑street parking, and density/intensity (subject to findings and conditions) (§ 17.55.030–.050).
  • Project approval & controls: A PD approval is tied to the approved site development plan; PD approvals may expire if construction does not commence within time limits (commonly 24 months unless extended) and the City may require the PD’s project-specific site development plan to be enforced as the regulating standard within the PD boundaries (§ 17.55.120–.140, .130).
  • Review path: PDs require Planning Commission review and City Council adoption by ordinance that references the approved development plan; minor revisions may be approved administratively if they do not increase density or intensity (§ 17.55.110–.130).

Practical note: Use the PD route when you need parcel‑specific flexibility (e.g., to mix uses, vary setbacks, or achieve a unique parking solution). Expect a formal concept plan, public hearings, and conditions that become part of the zone. Verify whether requested density increases must still stay within General Plan maxima or comply with state density bonus rules.

Quick reference table — most decision‑relevant standards / permitted uses

Overlay / Combining District Most relevant decision rules and typical permitted uses Code Reference
AO (Agricultural Overlay) Minimum area 5 acres; may be applied only where no habitable structures or where density ≤ 2 residences/5 gross acres; permitted uses limited to agricultural production and one SFD per lot (with foundation requirements); conditional uses by use permit (greenhouse, commercial livestock); fee waiver for AO application. § 17.56.010–.090
SP‑1 (Special Parking CZ #1) Applies to non‑residential districts west of Haskell St; no on‑site parking required for non‑residential uses; residential parking follows residential rules. § 17.58.010–.020
SP‑2 (Special Parking CZ #2) Applies within the Locust / Lateral No.8 / West Biggs‑Gridley / Highway 99 polygon; allows tandem parking and does not require residential spaces to be garage‑covered; other parking standards in Chapter 17.76 apply. § 17.58.030
PD (Planned Development, combining) Can be combined with any base zone; authorizes project‑specific modifications (setbacks, height, parking, density, signs) tied to an approved site development plan; subject to public hearings and ordinance. § 17.55.010–.140

Checklist (what an applicant must satisfy when an overlay or combining district is involved)

  • Confirm overlay/combine district shown on the City’s zoning map for the parcel (Verify with the jurisdiction).
  • If proposing work in an AO, demonstrate parcel area and that permitted uses are consistent with § 17.56.020–.040 (no urban uses until AO removal).
  • For AO conditional uses, prepare a use permit application showing operational limits (greenhouse, livestock) per § 17.56.060.
  • If within SP‑1 or SP‑2, document how parking demand will be met (on‑street, shared, tandem) and reference the SP exceptions in § 17.58.020–.030. Link parking plan to the City’s parking policies.
  • For any PD request, submit a concept plan and proposed site development plan, show General Plan consistency, and prepare for Planning Commission and City Council review per § 17.55.030–.110.
  • Where the overlay references other chapters (e.g., fence/sign rules in Chapter 17.72, parking Chapter 17.76), include compliance exhibits and use the City’s checklists: development standards, design review, and parking pages as applicable.
  • If building or altering a structure, coordinate submittal with code compliance teams and reference the California Building Standards Code for construction standards. Verify foundation references for dwellings in AO with the Health & Safety Code note cited in the AO rules.

Risks & Ambiguities

Issue Why it matters What to verify
AO supersedes base zoning If AO is present, many urban uses are not allowed until AO removal; building permits for non‑ag uses may be denied. Confirm whether AO covers the entire parcel or only a portion; confirm the AO minimum area and whether the parcel meets the AO qualifications (§ 17.56.020–.030).
Mapping boundaries for SP‑zones Downtown parcels on the edge of the polygon may be treated differently (lost opportunity for parking relief). Verify exact SP‑1 and SP‑2 boundaries with Planning; use parcel exhibit or city map and cite § 17.58.020–.030.
PD conditions become the regulating standard Once approved, PD conditions control future use — could limit later redevelopment flexibility. Review the PD ordinance and site development plan carefully; check expiration and extension rules (§ 17.55.120–.140) and whether minor revisions require Commission action.
Interplay with Chapter 17.72 (signs/fences) and 17.76 (parking) Overlay sections often defer to other chapters; missing those details can derail approvals. Read the referenced chapters when preparing applications; confirm any superseding language in the specific overlay chapter (see § 17.56.070–.080).
Fee waiver wording for AO Fee waiver may not cover all processing fees or related entitlements. Confirm current fee schedule and whether the waiver applies to the exact application type (§ 17.56.090 says there shall be no fee for AO application, but Verify with the jurisdiction).

Plain-English Summary

Gridley’s overlays are specific, map‑based addenda to normal zoning: the AO (Agricultural Overlay) keeps a parcel in agricultural use until it’s rezoned, SP parking overlays relax downtown parking rules, and the PD combining district lets the city approve a project‑specific development plan that can change setbacks, parking, or uses. Check the exact overlay boundaries on the City map and follow the cited code sections before you design or finance a project.

Source References

  • Gridley Municipal Code, Chapter 17.56 — AO Agricultural Overlay District, § 17.56.010–.090.
  • Gridley Municipal Code, Chapter 17.58 — SP Special Parking Combining Zones, § 17.58.010–.030.
  • Gridley Municipal Code, Chapter 17.55 — PD Planned Development District, § 17.55.010–.140.
  • Gridley zoning amendments and ordinance history (rezones showing use of combining/overlay zones) — ordinance table entries.

If you need scanned/original ordinance pages or the official municipal code web link, request the City’s published PDF or planning department parcel overlay map (Verify with the jurisdiction for parcel‑specific mapping).

Sources

Retrieved passages

  • Gridley Zoning Code (§ 20) High relevance
  • Gridley Zoning Code (§ 21) High relevance
  • Gridley Zoning Code (§ 19) High relevance
  • Gridley Zoning Code (Title 16) High relevance
  • Gridley Zoning Code (§ 21) High relevance
  • Gridley Zoning Code High relevance
  • Gridley Zoning Code High relevance
  • Gridley Zoning Code High relevance

Cited sections

Frequently asked questions

What does the AO (Agricultural Overlay) allow me to do on my Gridley parcel?

The AO allows principally commercial agricultural production and, under limited conditions, one single‑family dwelling per lot (with applicable foundation/installation requirements). AO parcels have their own permitted uses and generally prevent urban uses until the overlay is removed; see § 17.56.010–.040.

How big must a parcel be to qualify for the AO in Gridley?

An AO district must cover a minimum gross area of five (5) acres, and it may be applied only to parcels with no habitable structures or to portions that average no more than two residences per five gross acres (§ 17.56.020).

If my lot is in SP‑1 (Special Parking #1), do I need to build on‑site parking for a commercial business?

No — within SP‑1, which applies to non‑residential zoning west of Haskell Street, there is no on‑site parking requirement for non‑residential uses; however residential uses still follow the residential parking standard in the code (§ 17.58.020). Confirm the parcel falls inside SP‑1.

What parking exceptions apply in SP‑2 (Downtown residential area)?

For SP‑2 (the polygon bounded by Locust St., Lateral No. 8, West Biggs‑Gridley Rd., and Hwy 99), the code allows that required residential parking need not be covered by a garage and tandem parking is permitted; other parking standards still apply unless specifically modified (§ 17.58.030).

Can the City change setbacks, heights, or parking as part of a Planned Development (PD)?

Yes — the PD process authorizes the City to alter standards such as setbacks, height limits, sign requirements, building coverage limits, off‑street parking, and density/intensity limits for a specific PD project when consistent with the General Plan; PD approvals require public hearings and an ordinance tied to an approved site development plan (§ 17.55.040–.050) .

If a property is R‑1/AO, can I build a new commercial use now?

Not without first removing the AO. The AO supersedes the base zoning for permitted uses — to allow non‑agricultural uses you must pursue a zoning amendment (rezoning) to remove the AO pursuant to Chapter 17.06; until then only AO uses are permitted (§ 17.56.030, Chapter 17.06 referenced). Verify with Planning.

Do AO applications in Gridley have an application fee?

The AO chapter states there shall be no fee applied to an application for this Agricultural Overlay Zone; however you should confirm current fee schedules and whether related entitlements or environmental review carry fees (§ 17.56.090). Verify with the jurisdiction.

Does PD approval expire if construction doesn’t start?

Yes — unless the PD is associated with a tentative subdivision or parcel map, the approved PD will expire if construction has not commenced within 24 months; the City may grant a one‑year extension prior to expiration (§ 17.55.140).

Where does the AO refer me for signs and fences?

The AO defers to the general provisions of Chapter 17.72 for fences and signs; that means you must check Chapter 17.72 standards when planning fences or signage on an AO property (§ 17.56.070–.080).

If I need to change the overlay boundary or remove the AO, what process applies?

Removal or amendment of an overlay designation is a zoning amendment/rezone process subject to public hearings and the procedures in Chapter 17.06 of the code; check the rezone filing requirements and map exhibits in that chapter. Not found in retrieved materials: the step‑by‑step fee/time schedule — Verify with the jurisdiction.

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