St. Helena — Zoning

Last reviewed: July 6, 2026

Overview

St. Helena’s zoning rules live in Title 17 of the St. Helena Municipal Code and are applied through the city’s official zoning map; together they regulate what you can build, where, and at what scale. Start at the city’s zoning & planning overview, then confirm your site’s base district and any overlays on the official zoning map referenced in § 17.01.070 (the code notes changes can occur over time) . Use this page to navigate the city’s actual district names, permitted uses, and dimensional standards.

The single most important step is to confirm your parcel’s base district in § 17.15.020 and any overlay in § 17.21.005 before looking up permitted uses and development standards for that combination.

How St. Helena organizes zoning

• Base districts are established in § 17.15.020 and include residential (LR-1A, LR, MR, HR), commercial/mixed-use (CB, SC, MU), business/industrial (BPO, I), community resource (A-20, W, WW), and civic/open space (PQP, PR, OS) .
• Overlay districts in § 17.21.005 layer on special rules: FP, MHP, PED, HP, PD .

Use-specific standards frequently cross-reference Division III “Use Regulations” (e.g., ADUs, small wineries). If your project also needs design review or adjusted parking, those chapters apply in addition to the base district rules.

Residential Zoning Districts (§ 17.16)

The residential chapter provides purpose, use tables, and dimensional standards for the city’s four neighborhoods. Use regulations are in § 17.16.020; core standards are in § 17.16.030 with small-lot and design standards in § 17.16.040 .

LR-1A — Low Density Residential, One-Acre Minimum

• Purpose: Large-lot single-family with compatible uses; max density about one unit/acre unless a qualifying ministerial two‑unit project per Chapter 17.31 applies (state law reference noted in purpose statement) .
• Typical permitted uses: Single-family homes, ADUs via § 17.22.030, family day care, accessory structures, and home occupations per § 17.16.020 .
• Key standards: Min lot area 1.0 acre, min width 70 ft, max coverage 35%, principal height 30 ft; front setbacks generally around 20 ft for structures under 25 ft tall (see full table for height-triggered adjustments) — § 17.16.030(B) .
• Where it applies: Edge-of-town large parcels; verify on the zoning map in § 17.01.070 reference .

LR — Low Density Residential

• Purpose: Single-family neighborhoods with accessory uses; 1–5 du/ac range per § 17.16.030(B) .
• Uses: Similar to LR‑1A; see § 17.16.020 for family day care, accessory buildings, and home occupations .
• Key standards: Min lot 7,000 sf, min width 70 ft, max coverage 35%, height 30 ft/2 stories, and a separate cap on primary building gross floor area by lot size (Table § 17.16.030(C)) .
• Where: Established single-family blocks citywide; confirm on map.

MR — Medium Density Residential

• Purpose: Duplexes and multifamily in a moderate scale; 5.1–16 du/ac per § 17.16.030(B) .
• Uses: Multifamily permitted as specified in § 17.16.020; small-lot patterns (e.g., cottage courts) allowed per § 17.16.040 .
• Key standards: Min lot 6,000 sf, min width 45 ft, max coverage up to 40% for wider lots, height 30 ft/2 stories, and private open space for multifamily (e.g., 80 sf/unit) — § 17.16.030(B) .
• Where: Transitional areas near services.

HR — High Density Residential

• Purpose: Higher-intensity multifamily close to services; 16.1–28 du/ac per § 17.16.030(B) .
• Uses: Multifamily forms per § 17.16.020; small-lot options by § 17.16.040 .
• Key standards: Min lot 7,000 sf, min width 45 ft, max coverage 55%, height 42 ft/3 stories, and 60 sf/unit of private open space for multifamily — § 17.16.030(B) .
• Where: Near downtown and corridors; verify map.

Commercial and Mixed-Use Districts (§ 17.17)

These districts cluster along the SR 29 corridor and in Downtown. Purpose statements and use tables are in § 17.17.010–.020; development and design standards are in § 17.17.030–.040 .

CB — Central Business

• Purpose: Pedestrian-oriented downtown; ground-floor retail/services with office and residential above; hotels/motels and stations by permit — § 17.17.010 .
• Uses: Banks, general business services, brewpubs (P), bars/microbreweries by CUP; multifamily allowed on upper floors by CUP; formula retail capped at four per zoning district per end note in § 17.17.020(A) .
• Key standards: FAR max 2.0, min lot 5,000 sf; Main Street frontage must be essentially continuous: 100% between Spring St and the Adams St alignment, 85% elsewhere on Main; height 35 ft with context step-downs — § 17.17.030(B) .
• Where: Downtown (Main Street). Main Street-specific transparency/entrance rules also apply in § 17.17.040(K) .

SC — Service Commercial

• Purpose: Auto-oriented and service retail not suitable for CB; strictly tourist-serving retail is prohibited — § 17.17.010 .
• Uses: Equipment rental/leasing (CUP), auto sales/service (CUP), agricultural supply (P); bars/microbreweries by CUP; drive-throughs not permitted — § 17.17.020(A) end notes .
• Key standards: FAR max 0.50, min lot 10,000 sf, min frontage build-out 60%, height up to 45 ft/3 stories (pitched) or 40 ft/3 (flat) with lower limits near residential — § 17.17.030(B) .
• Where: SR 29-serving corridors.

MU — Mixed-Use

• Purpose: Medium/high density residential integrated with retail/office; supports vertical and horizontal mixed-use; 12–20 du/ac — § 17.17.010 .
• Uses: Live/work by MUP; multifamily by CUP (upper floors required on Main Street); SRO permitted with standards; mobile food vendors allowed subject to § 17.22.150 — § 17.17.020(A) and cross-references .
• Key standards: FAR max 1.0, min lot 5,000 sf, min width 45 ft, min frontage build-out 50%, height 35 ft — § 17.17.030(B); MU near Main Street must meet the same transparency and entrance orientation rules as CB — § 17.17.040(K) .

Business and Industrial Districts (§ 17.18)

Use regulations in § 17.18.020(A); dimensional and design standards in § 17.18.030–.040.

BPO — Business and Professional Office

• Purpose/uses: Office, limited R&D (CUP), and related services; some child care and public services as noted — § 17.18.020(A) .
• Key standards: Density up to 20 du/ac (if residential allowed by permit), FAR max 0.50, min lot 7,000 sf, front setback 20 ft, street side 10 ft, rear 15 ft, waterway setbacks apply; landscaping min 15% lot area and buffers to ag/res uses required — § 17.18.030(B) .

I — Industrial

• Purpose/uses: Contractor yards, warehousing/distribution (P), manufacturing/processing (CUP), and associated facilities; research and development allowed (permit level varies) — § 17.18.020(A) .
• Key standards: FAR 0.50 (up to 0.60 if >90% warehousing), min lot 20,000 sf, height 45 ft (lower within 100 ft of res/A‑20/W), front setback 25 ft plus 35 ft buffer to sensitive districts; landscaping min 10%; enhanced screening next to nonindustrial districts — § 17.18.030(B)–.040 .

Community Agricultural & Natural Resource Districts (§ 17.19)

Purpose and use table in § 17.19.010–.020; standards in § 17.19.030.

A-20 — Twenty-Acre Agriculture

• Purpose: Preserve agricultural land and phase urban expansion; limited residential with agricultural focus — § 17.19.010 .
• Uses: Single-family (on >2‑acre parcels the residence must be accessory to ag), cultivated agriculture, animal husbandry with limits, small wineries/roadside stands by permit; accessory ag uses — § 17.19.020(A) and end notes .
• Key standards: Very large setbacks (e.g., 50 ft from street centerlines in many cases), large lot width expectations, and max 1 unit/5 acres density guidance; waterway setbacks 50 ft (Napa River) and 20 ft (others) — § 17.19.030(B) .

W — Winery

• Purpose: Allow wineries and winery-related uses in agriculture areas — § 17.19.010 .
• Uses: Winery manufacturing/processing by CUP; accessory indoor winery uses (e.g., labs, repair shops) permitted; outdoor winery equipment within 400 ft of any R zone or 200 ft of Hwy 29/Silverado Trail/Deer Park Rd requires CUP; tank rules tied to production changes — § 17.19.020(A) end notes .
• Key standards: Similar rural setbacks/coverage controls and waterway buffers — § 17.19.030(B) .

WW — Woodlands and Watershed

• Purpose: Low-intensity residential that minimizes environmental impacts — § 17.19.010 .
• Uses: Single-family; limited ag/open space activities per table — § 17.19.020(A) .
• Key standards: Height tied to natural grade (e.g., 35 ft above natural grade), larger lot widths, and proportional setbacks — § 17.19.030(B) .

Public and Open Space Districts (§ 17.20)

Purpose, uses, and standards are in § 17.20.010–.040.

PQP — Public and Quasi-Public

• Purpose/uses: Government facilities, schools, churches, utilities, libraries, emergency services — § 17.20.010–.020 .
• Key standards: FAR 0.15–0.5, coverage 50%, height 30 ft, and area-typical setbacks; waterway buffers apply — § 17.20.030(B) .

PR — Parks and Recreation

• Purpose/uses: Public parks and passive open spaces; recreational facilities by permit — § 17.20.010–.020 .
• Key standards: Coverage 50%, height 30 ft, with large setbacks (e.g., 75 ft front) — § 17.20.030(B) .

OS — Open Space

• Purpose/uses: Conserve natural resources and waterways (Napa River, Sulphur Springs, York, Spring Creeks) — § 17.20.010 .
• Key standards: Coverage 10% or 20,000 sf (lesser), height 30 ft, significant setbacks; special note for limited development along Sulphur Springs Creek west of Crane Ave Bridge — § 17.20.030–.040 .

Overlay Districts (§ 17.21)

FP — Flood Plain Overlay

• What it does: Adds flood-protection rules to any base district; prohibits critical facilities (hospitals, fire stations, telecom, etc.) in the FP; mandates waterway buffers (50 ft Napa River, 20 ft Sulphur Springs Creek) and measures building height from flood elevation — § 17.21.010 .

MHP — Mobile Home Park Overlay

• What it does: When combined with a residential base zone, enables mobile home parks via concurrent rezoning and CUP; requires screening, landscaped setbacks, and compliance with state Mobilehome Parks Act (HCD is enforcement agency) — § 17.21.020 .

PED — Parking Exemption District

• What it does: Within this downtown overlay (generally in CB), projects are exempt from on-site parking requirements; existing on-site parking must be maintained. The code notes future updates may follow a downtown parking study. Also see shared-parking and TDM reductions in § 17.26.060 — § 17.21.030; § 17.26.060 .

HP — Historic Preservation Overlay

• What it does: Adds design compatibility rules and allows use of the California Historic Building Code where appropriate to preserve resources — § 17.21.040 .

PD — Planned Development Overlay

• What it does: Allows custom, master-planned projects that can replace base-zone standards with a PD plan if findings are met; typically minimum 1 acre (can be smaller with specific findings). Requires a policy statement and development plan detailing uses, density/FAR, setbacks/heights, parking, landscaping, and design guidelines; PDs are processed as zoning map amendments — § 17.21.050 .

Citywide Zoning Rules You’ll Keep Bumping Into

• Performance standards: Nuisance controls for dust/fumes, vibration, hazardous materials, waste, etc., apply citywide — see § 17.28.010–.110 .
• Measuring lots/setbacks: Definitions and measurement rules in Division V (e.g., how to determine front/rear/side lot lines and setbacks, and treatment of alleys/flag lots) — § 17.34.040, § 17.34.080 .
• Landscaping: Downtown/Main Street parcels in CB/MU that build to the sidewalk have no landscape requirement at the frontage; otherwise citywide standards apply — § 17.25.050(C) .
• Parking: PED area waives on-site parking; elsewhere see reductions for shared parking and TDM — § 17.26.060–.070. Cross-check with district-specific frontage rules and downtown design standards before planning curb cuts — § 17.17.040; see Parking for how reductions are applied .
• Accessory/related uses: Many uses link to Division III standards (e.g., small wineries § 17.22.230, live/work § 17.22.140, ADUs § 17.22.030) referenced throughout the use tables — see the endnotes in § 17.17.020(A) and § 17.19.020(A) for cross-references .

Decision-Critical Snapshot: Commercial & Mixed-Use Standards

Note: Main Street storefront transparency and entrance-orientation rules apply in CB and MU per § 17.17.040(K); plan facades and door recesses accordingly .

Checklist

• Confirm base district and any overlays on the official zoning map cited in § 17.01.070 (map controls where districts apply) .
• Verify your use in the applicable table: residential § 17.16.020; commercial/mixed-use § 17.17.020(A); business/industrial § 17.18.020(A); ag/natural resource § 17.19.020(A); public/open space § 17.20.020(A) .
• Check dimensional standards for your district (lot size/width, coverage/FAR, height, frontage, setbacks): § 17.16.030, § 17.17.030(B), § 17.18.030(B), § 17.19.030(B), § 17.20.030(B); confirm waterway buffers where applicable .
• If Downtown/Main St, account for storefront transparency, entrance orientation, and frontage build-out in § 17.17.040(K) and § 17.17.030(B) .
• If in FP, HP, MHP, PED, or PD, layer those standards atop the base zone — § 17.21.010–.050; PED also interacts with parking reductions § 17.26.060 .
• Confirm citywide performance standards (noise/dust/fumes, hazardous materials) in § 17.28 and measurement rules in § 17.34; reconcile with development standards and landscaping where applicable .
• For ADUs or small-lot infill, use the district table plus § 17.22.030 and § 17.16.040; see the city’s ADU page for ministerial allowances under California ADU law (zoning controls still apply) .

Risks & Ambiguities

Plain-English Summary

Zoning in St. Helena is a map-plus-rules system: find your base district, layer any overlays, then check the district’s use table and dimensional standards. Downtown builds to the sidewalk with active storefronts, corridors handle auto-oriented services, and neighborhoods scale from single-family to small apartments. Buffers to creeks and strict design rules on Main Street are common curveballs; check them early.

Source References

• § 17.01.020–.040 Authority, purpose, applicability; zoning map reference § 17.01.070 (official map) — Title 17 intro and map notes
• § 17.15.020 Base zoning districts (LR‑1A, LR, MR, HR, CB, SC, MU, BPO, I, A‑20, W, WW, PQP, PR, OS)
• § 17.16.010–.040 Residential districts: use and development standards; small-lot/design standards
• § 17.17.010–.040 Commercial/Mixed-Use: purpose, use tables, development and downtown design standards
• § 17.18.020–.040 Business/Industrial: use tables, development, buffers and screening
• § 17.19.010–.030 Agricultural/Natural: A‑20, W, WW purposes, uses, standards and winery notes
• § 17.20.010–.040 Public/Open Space: PQP, PR, OS purposes, uses, and standards (including creek-related OS limits)
• § 17.21.005–.050 Overlays: FP, MHP, PED, HP, PD (including PD procedures/findings)
• § 17.22 Division III selected cross-references (ADUs, live/work, small wineries, mobile food vendors)
• § 17.25 Landscaping (Main St frontage exception in CB/MU)
• § 17.26 Parking: reductions and general provisions (incl. PED linkage)
• § 17.28 Citywide performance standards (nuisance/impacts)
• § 17.34 Definitions and rules of measurement (lots, setbacks)

Retrieved passages

• St. Helena Zoning Code (Title 17) High relevance show source text
• St. Helena Zoning Code (Chapter 17.19) High relevance show source text
• St. Helena Zoning Code (chapter establishes) High relevance show source text
• St. Helena Zoning Code (Section 17.34.040) High relevance show source text
• St. Helena Zoning Code (Title 17) High relevance show source text
• St. Helena Zoning Code (Title 17) High relevance show source text
• CFC § 5 (Title 17) High relevance show source text
• St. Helena Zoning Code (Title 17) High relevance show source text
• St. Helena Zoning Code (chapter enables) High relevance show source text
• St. Helena Zoning Code (§ 5) High relevance show source text
• St. Helena Zoning Code (Title 17) High relevance show source text
• St. Helena Zoning Code (Title 17) High relevance show source text
• St. Helena Zoning Code (Title 17) High relevance show source text
• St. Helena Zoning Code (Title 17) High relevance show source text
• St. Helena Zoning Code (§ 5) High relevance show source text
• CBC § 5 (§ 5) High relevance show source text
• St. Helena Zoning Code (Title 17) High relevance show source text
• St. Helena Zoning Code (Title 17) High relevance show source text
• St. Helena Zoning Code (Chapter 17.21) High relevance show source text
• St. Helena Zoning Code (Title 17) High relevance show source text
• St. Helena Zoning Code (Title 25) High relevance show source text

Cited sections

• § 17.01.020–.040 Authority, purpose, applicability; zoning map reference § 17.01.070 (official map) — Title 17 intro and map notes (§ 17.01.020)
• § 17.15.020 Base zoning districts (LR‑1A, LR, MR, HR, CB, SC, MU, BPO, I, A‑20, W, WW, PQP, PR, OS) (§ 17.15.020)
• § 17.16.010–.040 Residential districts: use and development standards; small-lot/design standards (§ 17.16.010)
• § 17.17.010–.040 Commercial/Mixed-Use: purpose, use tables, development and downtown design standards (§ 17.17.010)
• § 17.18.020–.040 Business/Industrial: use tables, development, buffers and screening (§ 17.18.020)
• § 17.19.010–.030 Agricultural/Natural: A‑20, W, WW purposes, uses, standards and winery notes (§ 17.19.010)
• § 17.20.010–.040 Public/Open Space: PQP, PR, OS purposes, uses, and standards (including creek-related OS limits) (§ 17.20.010)
• § 17.21.005–.050 Overlays: FP, MHP, PED, HP, PD (including PD procedures/findings) (§ 17.21.005)
• § 17.22 Division III selected cross-references (ADUs, live/work, small wineries, mobile food vendors) (§ 17.22)
• § 17.25 Landscaping (Main St frontage exception in CB/MU) (§ 17.25)
• § 17.26 Parking: reductions and general provisions (incl. PED linkage) (§ 17.26)
• § 17.28 Citywide performance standards (nuisance/impacts) (§ 17.28)
• § 17.34 Definitions and rules of measurement (lots, setbacks) (§ 17.34)
• StHelena_ZoningCode.md

• Official St. Helena code library