American Canyon — Overlay Districts

Last reviewed: July 3, 2026

Overview

Overlay districts in American Canyon are zoning layers applied on top of base zones to allow specialized uses, densities, or standards on selected parcels. The city's zoning ordinance (Title 19) implements the overlays most frequently used in the city: CS (Specialty Commercial), MHP (Mobilehome Park) and its senior variant MHP‑S, and the RO (Residential Overlay) used where higher-density apartments are warranted. The ordinance spells out purposes, permitted/conditional uses, and development controls for each overlay and prescribes how an overlay is applied or removed by map amendment. See the city's base American Canyon Zoning rules and the American Canyon Development Standards for how overlays interact with setbacks, lot coverage and similar controls.

How this page is organized

Below is a district-by-district breakdown (purpose, typical uses, key dimensional standards, where it applies), a decision‑relevant standards table, practical guidance on approvals and submittal expectations, a checklist, risks & ambiguities, a homeowner plain‑English summary, and primary source references.

CS — Specialty Commercial Overlay District

• Purpose: The CS overlay is intended to promote commercial or visitor‑oriented uses on sites with unique views or natural characteristics, encouraging development that leverages public access and views (§ 19.19.010) .
• Typical permitted uses (if owner elects commercial use rather than the underlying industrial use): bank, restaurant, lodging, personal services, visitor‑oriented retail, public information center, and public parking; certain uses are allowed only with a conditional use permit (on‑premises liquor, live entertainment, lodging adjacent to residential) (§ 19.19.020) .
• Key dimensional / design controls:
  • Development standards default to the LI base district schedule (see the LI district rules) (§ 19.19.030(A)) .
  • Overlay‑specific design criteria require orientation to views, architecture that blends with hillsides, and when a discretionary design permit is required the project must include a public pedestrian easement to view areas (§ 19.19.030(B)(1)–(3)) .
  • Special requirements for long‑term care facilities in some Napa County Airport compatibility zones (acoustical study, overflight easement, review by Airport Land Use Commission) (§ 19.19.030(5)–(9)) .
• Where it applies: Mapped onto specific parcels (see the official zoning map). If you propose a commercial project, check whether the parcel is in CS or retains the underlying industrial base zone (verify on the zoning map) — verify with the jurisdiction.

Practical note: projects in CS that require a design permit will go through the city's design review process; refer to the local American Canyon Design Review guidance early in design work.

MHP — Mobilehome Park Overlay District (and MHP‑S senior overlay)

• Purpose: The MHP overlay protects and provides for mobilehome park development as a source of affordable housing and ensures appropriate design, open space, and health/safety standards (§ 19.18.010) .
• Typical permitted uses:
  • Permitted through a design permit: mobilehome park, accessory recreational and common facilities, caretaker’s quarters (§ 19.18.020(A)) .
  • Conditionally permitted with a conditional use permit: mobilehome subdivision and the underlying base zone's permitted/conditional uses (§ 19.18.020(B)) .
• Key dimensional / development standards (decision‑critical):
  • Minimum project area: 10 acres (§ 19.18.030(A)) .
  • Minimum individual mobilehome site area: 3,680 sq ft (§ 19.18.030(B)(2)) .
  • Minimum site width per space: 46 ft (§ 19.18.030(C)) .
  • Perimeter landscaped buffer: 20 ft along exterior boundaries (or 30 ft when adjacent to a public roadway) (§ 19.18.030(D)) .
  • Minimum yards: Front yard 15 ft; Side & rear yards 5 ft (§ 19.18.030(E)(1)–(2)) .
  • Maximum height / stories: 25 feet and one story in the MHP overlay (§ 19.18.030(F)) .
  • Parking and loading must follow Chapter 19.21 (see the city's American Canyon Parking standards) (§ 19.18.030(H)(4) and cross‑references) .
• MHP‑S (Senior Mobilehome Park Overlay):
  • Where applied, MHP‑S requires that at least 80% of spaces be occupied by persons age 55+; occupancy verification is required biennially by survey/affidavit (§ 19.18.050(A), (E)–(F)) .
  • Signage/leases must state the park is a senior park (or “housing for older persons”) (§ 19.18.050(D)) .
• Where it applies: Mapped overlay on parcels identified as mobilehome parks; conversions away from mobilehome parks require rezoning to remove the overlay and compliance with the city's mobilehome park conversion ordinance (§ 19.18.020(C)) .

Practical note: because many MHP standards reference other chapters (parking, design permit process), coordinate early with planning and public works and consult American Canyon Parking and the California Building Standards Code for construction/installation standards.

RO — Residential Overlay District

• Purpose: The RO overlay allows higher‑density multifamily residential uses on selected sites within community commercial and neighborhood commercial base zones (§ 19.10.020(F)) .
• Key density and standards:
  • Density: 20 units/acre west of Broadway/Highway 29; 35 units/acre east of Broadway/Highway 29 (§ 19.10.020(F)) .
  • Development standards: Projects under the RO must comply with the multifamily and mixed‑use standards found in Tables 1 and 2 of Chapter 19.11 (see § 19.10.020(F) for cross‑reference) .
• Allowed uses: High‑density multifamily residential in single or mixed‑use structures in locations mapped with the overlay; all other uses follow the underlying commercial base zone rules unless the owner elects the RO use per the overlay text (§ 19.10.020(F)) .
• Where it applies: Specific sites shown on the official zoning map; the overlay is typically applied to commercial parcels where multifamily infill is desired.

Practical note: because the RO cross‑references Chapter 19.11 for dimensional standards, you must consult Chapter 19.11 tables for setbacks, lot coverage, FAR, height for RO sites (the ordinance directs compliance with those tables) — verify those numeric standards on a project‑by‑project basis in Chapter 19.11. Also confirm parking obligations under Chapter 19.21 and the city's American Canyon Parking rules.

Paoli Light Industrial Commercial Overlay (PLICO) — Paoli Commercial Overlay

• Purpose: The Paoli overlay is intended to allow commercial uses that take advantage of visibility and access from Highway 29 and Newell Drive and serve industrial parks (§ 19.20.010) .
• Status: The overlay text is reserved in the code (chapter heading exists) and § 19.20.010 states the purpose; specific mapped standards or tables are not contained in the reserved text (Chapter 19.20 marked Reserved) — Not found in retrieved materials for detailed permitted uses or numeric standards beyond the stated purpose (§ 19.20.010) .
• Where it applies: Mapped to Paoli/Newell Drive frontage parcels per the official zoning map when implemented (verify on the zoning map). Verify with the jurisdiction for current application or any implementing ordinance.

Decision‑relevant standards and uses — quick table

How to get an overlay applied to a parcel (process and findings)

• A property owner may initiate applying an overlay (a zoning map amendment) by filing an application with the community development department with required plans and materials (§ 19.48.030) .
• The planning commission reviews the proposal and makes recommendations; the city council approves or denies the amendment and must find the amendment is consistent with the General Plan and the purposes of the zoning ordinance (§ 19.48.040(A)–(C)) .
• If an overlay application triggers discretionary entitlements (design permit, conditional use permit, specific plan), those parallel review processes and findings apply (see Chapters 19.40–19.42, design permit Chapter 19.41 referenced by MHP uses) (§ 19.18.020(A), § 19.48.040) .
• Airport compatibility or other inter‑jurisdictional reviews may be required where overlays interact with the Napa County Airport Land Use Compatibility Plan (§ 19.19.020 and § 19.19.030 excerpts) .

Practical guidance: check the official zoning map and current implementing ordinances and consult planning staff early to determine whether your parcel already has the overlay, what the applicable Chapter/Tables require (e.g., Chapter 19.11 for RO), and whether you will need a design permit (see American Canyon Design Review) or a conditional use permit.

Checklist — what an applicant must satisfy when proposing overlay use or an overlay map amendment

• Confirm overlay presence or request map amendment with community development (application per § 19.48.030) .
• Demonstrate consistency with the General Plan (finding required per § 19.48.040(C)(1)) .
• Provide site plans showing compliance with overlay‑specific development standards (e.g., MHP dimensional standards § 19.18.030; RO densities per § 19.10.020(F) and Chapter 19.11 tables) .
• Complete design review or obtain a design permit where required (MHP uses, CS projects requiring a design permit; see Chapter 19.41) and consult American Canyon Design Review guidance .
• Provide parking and loading plans consistent with Chapter 19.21 and the city's American Canyon Parking standards .
• If in an airport compatibility zone, include any required acoustic studies and record any required overflight/avigation easement as described in § 19.19.030 .
• For MHP‑S, prepare documentation and a plan for biennial occupancy verification and appropriate signage (see § 19.18.050) .
• Prepare any required environmental review (CEQA) and fees; expect referrals to the Planning Commission and City Council per § 19.48.040 .
• Coordinate building code compliance (structural, life‑safety) with the adopted California codes (see the city's adoption of the California Administrative/Building codes) and the California Building Standards Code .

Risks & Ambiguities

Plain‑English Summary

In American Canyon, overlays are special zoning layers (for example CS, MHP, MHP‑S, RO) that modify what you can build on certain parcels. Each overlay has a clear purpose and numeric rules in Title 19 (e.g., the RO sets higher multifamily densities, MHP sets mobilehome park spacing and setbacks). To apply an overlay to a parcel or use an existing overlay you must follow the map‑amendment and permitting procedures in the zoning code and meet the specific design, parking, or airport‑compatibility requirements identified in the relevant overlay chapters (verify exact limits on the zoning map and in Chapters 19.10, 19.18, 19.19, and 19.20) .

Information Gaps (what the retrieved materials did not confirm)

• Exact numeric dimensional standards (setbacks, lot coverage, FAR, etc.) that apply to RO parcels are deferred to Chapter 19.11 Tables 1 & 2 — those tables were not included in the retrieved snippets here. Verify Chapter 19.11 directly for RO numeric standards (§ 19.10.020(F)) .
• The Paoli (19.20) overlay chapter is marked reserved beyond the stated purpose; detailed permitted uses/standards are Not found in retrieved materials (§ 19.20.010) .
• Official zoning map parcel‑level overlay boundaries and any recent overlay map amendments are not shown in the retrieved files; confirm with planning staff or the official map (verify in the planning department records).

Source References

• American Canyon Zoning Ordinance (Title 19) — RO (Residential Overlay): § 19.10.020(F)
• MHP (Mobilehome Park Overlay) and MHP‑S senior overlay: § 19.18.010–030, § 19.18.050
• CS (Specialty Commercial Overlay): § 19.19.010–030 (uses and development criteria)
• Paoli Light Industrial Commercial Overlay (purpose only): § 19.20.010 (Reserved)
• Zoning map amendment procedures (initiation and review): § 19.48.030–040
• Parking and loading cross‑references: Chapter 19.21 (see related cross references in residential and overlay chapters) and § 19.10.100 on parking in residential districts
• City adoption of California Building Standards and administrative codes: Title 16 adoptions and building code chapters (see City adoption references; consult the California Building Standards Code for the state codes adopted by the city)

Retrieved passages

• American Canyon Zoning Code (Chapter 19.11) High relevance show source text
• American Canyon Zoning Code (chapter shall) High relevance show source text
• American Canyon Zoning Code (Section 19.23.100.) High relevance show source text
• American Canyon Zoning Code (title for) High relevance show source text
• American Canyon Zoning Code (§ 1) High relevance show source text
• American Canyon Zoning Code (chapter establishes) High relevance show source text
• American Canyon Zoning Code (Section 19.19.010) High relevance show source text
• American Canyon Zoning Code (§ 1) Medium relevance show source text
• American Canyon Zoning Code (Chapter 19.11) High relevance show source text
• American Canyon Zoning Code (§ 1) Medium relevance show source text
• American Canyon Zoning Code (§ 4) Medium relevance show source text
• American Canyon Zoning Code (§ 1) Medium relevance show source text
• American Canyon Zoning Code (Title 25) Medium relevance show source text
• American Canyon Zoning Code (§ 2) Medium relevance show source text
• American Canyon Zoning Code (Section 19.53.030.) Medium relevance show source text

Cited sections

• American Canyon Zoning Ordinance (Title 19) — **RO (Residential Overlay)**: **§ 19.10.020(F)** (Title 19)
• **MHP (Mobilehome Park Overlay)** and **MHP‑S** senior overlay: **§ 19.18.010–030**, **§ 19.18.050** (§ 19.18.010)
• **CS (Specialty Commercial Overlay)**: **§ 19.19.010–030** (uses and development criteria) (§ 19.19.010)
• **Paoli Light Industrial Commercial Overlay** (purpose only): **§ 19.20.010** (Reserved) (§ 19.20.010)
• Zoning map amendment procedures (initiation and review): **§ 19.48.030–040** (§ 19.48.030)
• Parking and loading cross‑references: Chapter **19.21** (see related cross references in residential and overlay chapters) and **§ 19.10.100** on parking in residential districts (§ 19.10.100)
• City adoption of California Building Standards and administrative codes: Title 16 adoptions and building code chapters (see City adoption references; consult the California Building Standards Code for the state codes adopted by the city) (Title 16)
• AmericanCanyon_ZoningCode.md

• Official American Canyon code library