Chico — Overlay Districts

Last reviewed: July 1, 2026

Overview

Chico’s overlay districts are extra zoning layers that sit on top of the city’s base zone and add location‑specific rules for uses, height, noise, resource protection, and project review. The overlay rules are part of the Chico development regulations and are codified in the Municipal Code chapters that create and describe each overlay; the general authority and purpose are set out at § 19.52.010 . When an overlay is shown on the Zoning Map it is appended as a suffix to the base zoning symbol (for example, R1‑PD) and its rules apply in addition to the underlying zone standards . Many overlays change permit requirements, require additional studies, or establish stricter height/noise/landscape standards — check the specific overlay for controlling details.

First references to related topics used on this page:

• parking: Chico Parking
• development standards and setbacks: Chico Development Standards
• design review: Chico Design Review
• historic preservation: Chico Historic Preservation
• ADUs: Chico ADUs
• California Building Standards Code: California Building Standards Code
• Chico Zoning overview: Chico Zoning

District-by-district breakdown

Below are the overlays that appear in the Chico zoning/regulations with the practical essentials an applicant needs to know. Each subsection lists the stated purpose, typical permitted uses (how the overlay treats the base-zone uses), the most decision‑relevant dimensional or procedural standards, and where the overlay applies or how it is shown on the map.

Airport Environs (AE) — § 19.52.020

• Purpose: Protect airport operations and nearby properties by addressing noise, height, and avigation requirements. See § 19.52.020 .
• Permitted uses: Generally allows any use that the primary zoning district allows, but may require compliance with the related Aircraft Operations overlays and may prohibit certain uses listed for the aircraft overlay(s) (see the -AO tables) § 19.52.020 .
• Key standards & triggers:
  • Height limits of the applicable -AO zone control where they are more restrictive § 19.52.020 .
  • Noise insulation / CNEL targets and requirement to execute avigation easements/noise agreements and record a Notice of Aircraft Overflight on title prior to permits § 19.52.020 .
• Where it applies: Areas around Chico Municipal and Ranchero Airports mapped as -AE; see Airport Zoning Map and the Zoning Map suffix convention § 19.52.010 .

Airport Overflight (AO) — § 19.52.030 and development table § 19.52.030 (Table 4‑15)

• Purpose: Establishes five aircraft-related subzones (‑AOA, ‑AOB1, ‑AOB2, ‑AOC, ‑AOD) with specific height limits, open-land requirements, and use limitations to implement the Butte County Airport Land Use Compatibility Plan (ALUCP) § 19.52.030 .
• Permitted uses: Controlled by the primary zoning district but subject to additional AO restrictions (for example, certain high‑risk or noise‑sensitive uses may be limited or prohibited in specific AO subzones) § 19.52.030 .
• Key standards:
  • Table of development standards (open land requirements, airspace reviews for objects above a stated height, minimum noise reduction requirements, recorded notices and avigation easements) — see Table 4‑15 § 19.52.030 .
  • Strict maximum heights tied to mean sea level measurement (USGS datum) and airspace reviews for tall objects § 19.52.030 .
• Where it applies: Airport Zoning Map; AO overlays are applied as suffixes to base zones within the 50,000‑foot airport zone per the code § 19.52.030 .

Landmark (L) — § 19.52.040

• Purpose: Identify and protect landmarks/historic resources so development is compatible with preservation goals § 19.52.040 .
• Permitted uses: Base‑zone uses remain allowed but any work must comply with Chapter 19.37 (historic preservation) and may require a Certificate of Appropriateness or Certificate of Demolition § 19.52.040 .
• Key standards & process: Certificate requirements and potential for deviation of otherwise-applicable development standards to preserve historical attributes (see Chapter 19.37 referenced in § 19.52.040 ) .
• Where it applies: Mapped as a suffix on the Zoning Map; the overlay applies in combination with any primary zoning district § 19.52.040 .

Planned Development (PD) — § 19.52.050 and implementing rules in § 19.28.040

• Purpose: Provide flexibility for innovative projects and allow the Commission to approve site‑specific modifications while ensuring public benefits § 19.52.050 and § 19.28.020 .
• Permitted uses: Any use allowed by the primary zone unless the PD rezoning or approved PD permit limits uses § 19.52.050 .
• Key standards:
  • First development or new construction in a ‑PD requires a planned development permit; subsequent changes follow the underlying district unless the PD establishes different rules § 19.52.050 .
  • The PD process may modify setbacks, heights, parking, and open‑space requirements (see § 19.28.040: deviations for setbacks/height/parking and minimum 25% open space in many PDs) § 19.28.040 .
• Where it applies: Shown as the -PD suffix on the Zoning Map; rezoning to add -PD follows Chapter 19.06 and a PD permit guides development thereafter § 19.28.030 .

Resource Constraint (RC / RCO) — § 19.52.060

• Purpose: Protect areas with significant environmental resources that impose development constraints and require studies and coordination with resource agencies § 19.52.060 .
• Permitted uses: Base zone uses are allowed unless otherwise limited; major projects will require planned development permit approval and resource studies § 19.52.060 .
• Key standards:
  • Subdivisions limited or conditioned to preserve resources; clustering encouraged; grading prohibited until entitlements complete; Commission can waive/modify standards via PD where needed for preservation § 19.52.060 .
• Where it applies: Applied as -RC or -RCO suffix where General Plan designates RCO § 19.52.060 .

Special Design Considerations (SD) — § 19.52.070 (subareas SD‑1, SD‑2, etc.)

• Purpose: Applied where neighborhood or environmental features require special attention; includes area‑specific subcategories § 19.52.070 .
• Permitted uses: Base‑zone uses, except where a subarea’s rules limit them § 19.52.070 .
• Key standards (examples):
  • SD‑1 (South Chico): planned development permit required; clustering to protect riparian habitat and tree preservation requirements § 19.52.070 (SD‑1) .
  • SD‑2 (Humboldt Road‑Foothill): PD permit required; specific measures to minimize visual impact, maximum foothill heights (25 ft. typical unless visual simulations justify more), 50‑ft setback from SR‑32, native landscaping, and wildfire‑resilient design features § 19.52.070 (SD‑2) .
• Where it applies: Specific mapped subareas; check the Zoning Map suffix and SD subarea descriptions § 19.52.070 .

Corridor Opportunity Site (COS) — § 19.52.080

• Purpose: Encourage medium‑ and high‑density mixed use and pedestrian‑oriented streetscapes in targeted corridors or downtown opportunity sites § 19.52.080 .
• Permitted uses: Determined by the underlying zoning, but residential projects in COS have density expectations (minimum midpoint of allowable density unless vertically integrated or special findings are made) § 19.52.080 .
• Key standards:
  • Residential density: 15 units/acre minimum; up to 70 units/acre when associated with residential base zoning (office/commercial base may allow up to 60 units/acre) § 19.52.080 .
  • Maximum height: 65 ft unless underlying zone allows more § 19.52.080 .
  • Off‑street parking reductions allowed per Chapter 19.70 § 19.52.080 .
• Where it applies: Mapped Corridor Opportunity Sites and Downtown Opportunity Sites; shown as -COS suffix § 19.52.080 .

Fraternity and Sorority (FS) — § 19.52.090

• Purpose: Encourage fraternity/sorority houses near CSU Chico while preserving neighborhood character § 19.52.090 .
• Permitted uses: Base uses apply; fraternity and sorority houses are permitted subject to a Director‑issued fraternity/sorority house permit under Chapter 19.21 § 19.52.090 .
• Where it applies: Combined with R3, R4, RMU residential districts as the -FS suffix § 19.52.090 .

Foothill Development (FD) — § 19.52.100

• Purpose: Prevent slope failure, protect ridgelines and vegetation, minimize grading and visual impacts in foothill areas § 19.52.100 .
• Permitted uses: Base‑zone uses unless limited; foothill developments trigger a Foothill Development Permit (see § 19.27.010 referenced in the ordinance) § 19.52.100 .
• Key standards:
  • Default height limit 25 ft measured from natural pre‑development grade, with limited 5 ft exceptions for projections; heights up to 35 ft possible where no viewshed impacts occur § 19.52.100 .
  • Special measurement rules for downhill lots, toe/top of slope setbacks, graded area limits, slope‑based density reductions, required geotechnical and hydrology reports and visual simulations § 19.52.100 and related application exhibit lists § 19.52.100 and § 19.27/19.28 materials .
• Where it applies: Properties at or above an elevation threshold (the code uses 270 feet as an application basis) and mapped as -FD on the Zoning Map § 19.52.100 .

Valley’s Edge (VE) — § 19.52.110

• Purpose: Implement the Valley’s Edge Specific Plan; where VE applies, the Specific Plan dictates allowable uses and standards § 19.52.110 .
• Permitted uses & standards: Uses and development standards come from Appendix C and the Valley’s Edge Specific Plan; if the Specific Plan is silent, the general regulations apply § 19.52.110 .
• Where it applies: Mapped to the Valley’s Edge area, applied as ‑VE suffix § 19.52.110 .

Quick reference table — decision‑relevant snapshot

Checklist — what an applicant must satisfy (typical)

• Identify all overlay suffixes on the parcel (check Zoning Map; overlays are added as suffixes) § 19.52.010 .
• Confirm the permit required for the overlay: PD permit, Foothill permit, Frat/Sorority Director permit, etc., per the overlay language (e.g., PD requires PD permit; FD requires Foothill Development permit) § 19.52.050 .
• For airport overlays, prepare required noise/airspace documentation and be ready to record avigation easement / Notice of Aircraft Overflight where applicable § 19.52.020 .
• Where the overlay requires special studies (RC, FD, SD subareas), assemble technical reports: biological, soils/geotech, hydrology, visual simulations/story poles per the exhibit lists § 19.52.060 .
• Determine whether the overlay allows or requires deviations to setbacks, height, or parking; if proposing deviations under a PD, include those changes in the PD application and development plan (see PD/PD permit development standards) § 19.28.040 .
• Prepare landscape/maintenance plans and open‑space calculations where PD or FD standards demand them (PD open‑space minimums and maintenance district language) § 19.28.040 .
• Anticipate design review and hearings: many PD, FD, COS, and L projects require review under design review rules; coordinate materials with the Chico Design Review process § 19.28.050 .
• If proposing ADUs or accessory units, ensure compliance with ADU rules and note overlay constraints that may affect siting or height; consult the Chico ADUs guidance and state ADU rules where applicable § 19.52.010 and definitions .
• Verify compliance with applicable City development standards including parking calculations and possible reductions (see Chico Parking and Chapter 19.70) § 19.52.080 .

Risks & Ambiguities

Plain‑English summary

Chico’s overlay zones (the “‑AE,” “‑AO,” “‑FD,” “‑PD,” “‑COS,” etc.) are extra, parcel‑specific rules layered on top of your base zoning: they can change permit triggers, add required studies, restrict heights or uses (airport overlays), or push density and design expectations (corridor/PD overlays). Always read the overlay section that appears as the suffix on your zoning map because the overlay language — not just the base zone table — controls where there is any difference § 19.52.010 .

Source References

• Chico Municipal Code, Chapter 19.52 — Chapter introduction and overlay purpose/applicability: § 19.52.010 .
• Airport Environs overlay: § 19.52.020 .
• Airport Overflight overlay and development table (Table 4‑15): § 19.52.030 .
• Landmark overlay and historic requirements: § 19.52.040 (references Chapter 19.37) .
• Planned Development overlay and PD standards: § 19.52.050 and PD development standards in § 19.28.040 .
• Resource Constraint overlay: § 19.52.060 .
• Special Design (SD) overlay and SD‑1/SD‑2 examples: § 19.52.070 .
• Corridor Opportunity Site (COS): § 19.52.080 (density, 65 ft height, off‑street parking reductions) .
• Fraternity/Sorority overlay: § 19.52.090 .
• Foothill Development overlay and its application standards: § 19.52.100 and application materials lists (reports, visual simulations): § 19.52.100 and related exhibit requirements § 19.52.100 / § 19.27 / § 19.28 .
• Valley’s Edge overlay (VE) and cross‑reference to the Valley’s Edge Specific Plan: § 19.52.110 .
• Definitions (overlay list and overlay abbreviations): Definitions section showing overlay list § 19.04 (Definitions) .
• Zoning district rules and tables (density/height examples that interact with overlays): Division IV and tables including Table 4‑4 and development standards tables § 19.40.020 / Table 4‑4 .
• Site design, project review and PD procedures: § 19.28.050 and § 19.28.040 (project review and development standards) .

If you want, I can pull the specific overlay map legend entries for a parcel address (verify with the City) or extract the exact sub‑area rules (for example, the full SD‑2 list) and assemble a permit‑ready checklist keyed to your site. Verify parcel‑specific details with the Community Development Department and confirm map suffixes before filing.

Retrieved passages

• Chico Zoning Code (article may) High relevance show source text
• Chico Zoning Code (§17) High relevance show source text
• Chico Zoning Code (Chapter 19.28) High relevance show source text
• Chico Zoning Code (Chapter 19.06) High relevance show source text
• Chico Zoning Code (chapter regulate) High relevance show source text
• Chico Zoning Code (§43) High relevance show source text
• Chico Zoning Code (Chapter 19.70.) High relevance show source text
• Chico Zoning Code (§38) Medium relevance show source text
• Chico Zoning Code (Title 18R.) High relevance show source text
• Chico Zoning Code (§36) High relevance show source text
• Chico Zoning Code (section showing) High relevance show source text
• Chico Zoning Code (§2) Medium relevance show source text

Cited sections

• Chico Municipal Code, Chapter 19.52 — Chapter introduction and overlay purpose/applicability: **§ 19.52.010** . (Chapter 19.52)
• Airport Environs overlay: **§ 19.52.020** . (§ 19.52.020)
• Airport Overflight overlay and development table (Table 4‑15): **§ 19.52.030** . (§ 19.52.030)
• Landmark overlay and historic requirements: **§ 19.52.040** (references Chapter 19.37) . (§ 19.52.040)
• Planned Development overlay and PD standards: **§ 19.52.050** and PD development standards in **§ 19.28.040** . (§ 19.52.050)
• Resource Constraint overlay: **§ 19.52.060** . (§ 19.52.060)
• Special Design (SD) overlay and SD‑1/SD‑2 examples: **§ 19.52.070** . (§ 19.52.070)
• Corridor Opportunity Site (COS): **§ 19.52.080** (density, 65 ft height, off‑street parking reductions) . (§ 19.52.080)
• Fraternity/Sorority overlay: **§ 19.52.090** . (§ 19.52.090)
• Foothill Development overlay and its application standards: **§ 19.52.100** and application materials lists (reports, visual simulations): **§ 19.52.100** and related exhibit requirements **§ 19.52.100 / § 19.27 / § 19.28** . (§ 19.52.100)
• Valley’s Edge overlay (VE) and cross‑reference to the Valley’s Edge Specific Plan: **§ 19.52.110** . (§ 19.52.110)
• Definitions (overlay list and overlay abbreviations): Definitions section showing overlay list **§ 19.04 (Definitions)** . (section showing)
• Zoning district rules and tables (density/height examples that interact with overlays): Division IV and tables including Table 4‑4 and development standards tables **§ 19.40.020 / Table 4‑4** . (§ 19.40.020)
• Site design, project review and PD procedures: **§ 19.28.050** and **§ 19.28.040** (project review and development standards) . (§ 19.28.050)
• Chico_ZoningCode.md

• Official Chico code library