Stanislaus County — Zoning

Last reviewed: July 6, 2026

Overview

Stanislaus County’s zoning rules live in Title 21, “Zoning,” of the County Code and apply only in the unincorporated areas; incorporated cities maintain their own zoning codes. The County establishes a zoning plan, maps, and district regulations to carry out the General Plan and protect agriculture, neighborhoods, and industrial/commercial areas. The adopted zoning map is part of the ordinance and governs what you can build or operate on a parcel in unincorporated areas. See the Stanislaus County zoning & planning overview for the bigger picture and how this page fits with related topics like Land Use and Development Standards. The County’s list of zoning districts and the reference to the official district maps are codified in the ordinance itself under the comprehensive plan provisions and district listing.

Key rule: Check your parcel’s zone on the County’s official zoning maps before designing anything—Title 21’s maps are adopted by reference and control the permitted uses and standards on the ground. See § 21.16.020.

Using the zoning map in unincorporated areas

• The County lists all zoning districts and adopts official zoning maps by ordinance; those maps and all notations are part of Title 21. See § 21.16.010–.020.
• Boundary rules, definitions (e.g., what is a “front yard”), and how setbacks are measured are in Title 21’s definitions chapter. See, for example, § 21.12.640–.660 and the measurement rule quoted within the definitions.
• If your property lies within a special plan or overlay area (e.g., the Salida Community Plan or Historical Site), those rules add to or modify base zoning. See “SCP” and “HS” below, and also visit Overlay Districts and Historic Preservation.

District-by-district guide (unincorporated Stanislaus County)

The ordinance lists these districts: A-2, R-A, R-1, R-2, R-3, P-D, PI, HS, H-1, C-1, C-2, M, LM, US, S-P, and SCP. Where detailed standards or permitted-use lists were not located in the retrieved materials, they are noted as “Not found in retrieved materials.” See the countywide district roster at § 21.16.010.

A-2 — General Agriculture

• Purpose and where applied: Agricultural lands and related uses in unincorporated areas. Listed in § 21.16.010.
• Typical permitted uses: Portions of the A-2 “permitted” list are visible in the retrieved code (seasonal produce/holiday lots, produce stands, certain employee housing), but the complete permitted use list is incomplete here. Examples appear under A-2 “permitted” items L–P (e.g., Christmas tree/pumpkin lots, fireworks stands, produce stands, limited agricultural employee housing with a permit under Chapter 21.100). See § 21.20.020 (partial in retrieved text) and cross-references in § 21.20.030.
• Uses requiring a use permit: Tier One and Tier Two agriculture-supporting industries (e.g., dehydrators, hulling/shelling, certain processing, agricultural service airports, larger employee housing) with findings. See § 21.20.030.
• Key dimensional standards: Not found in retrieved materials.
• Notes: Accessory Dwelling Units (ADUs) are allowed, subject to Chapter 21.74 and special siting for A-2 (ADU within 150 feet of the main dwelling unless approved via staff-level permit and compatible with continued ag use). See § 21.74.020–.040 and A-2 siting note at § 21.74.040(C)(1).

R-A — Rural Residential

• Purpose: Large-lot rural living in unincorporated areas. Listed in § 21.16.010.
• Typical permitted uses: Not found in retrieved materials. Uses needing a use permit include residential care homes (location-specific findings), certain stables/clubs on larger parcels, parks/golf, certain A-2 activities where plan-consistent, civic uses, resource extraction, and mobile home parks (with sewer/water). See § 21.24.030.
• Key dimensional standards:
  • Minimum building site area varies by utilities (e.g., 8,000 sq ft with public sewer/water; 20,000 sq ft with one public utility; 1 acre with well/septic) and by General Plan designation; special minimums for urbanized area/cluster; health department approvals required. See § 21.24.060.
  • Lot coverage: 40% maximum, subject to HOME Act exception cross-reference. See § 21.24.070.
  • Yards: Front yard measured to street centerline or planned line; typical side/rear 5 ft; additional setbacks for livestock buildings (50 ft from street, 40 ft from property line). See § 21.24.080.
  • Height: 35 ft. See § 21.24.040(A).
• Parking: See Chapter 21.76; start with Parking. § 21.24.090.

R-1 — Single-Family Residential

• Purpose: Low-density residential neighborhoods in unincorporated areas. Listed in § 21.16.010.
• Typical permitted uses: Not found in retrieved materials. Use permits cover items like churches, hospitals, public buildings; mobile home parks (sewer/water); larger day care. See § 21.28.030.
• Key dimensional standards:
  • Height: Dwellings 35 ft; detached accessory 20 ft; fence limits apply. See § 21.28.040.
  • Minimum building site area: 5,000 sq ft (sewer/water); 20,000 sq ft (one public utility); 1 acre (well/septic); special urbanized area provisions. See § 21.28.050.
  • Lot coverage: 50% max, subject to special section allowance. See § 21.28.060.
  • Lot width: Determined by Title 20 (Subdivision). See § 21.28.045.
• ADUs: Allowed by Chapter 21.74; see also California ADU law for state baseline. § 21.74.020–.040.

R-2 — Medium-Density Residential

• Purpose: Two-family and small multi-unit patterns in unincorporated areas. Listed in § 21.16.010.
• Typical permitted uses: Not found in retrieved materials.
• Key dimensional standards:
  • Lot coverage: 60% max. See § 21.32.060.
  • Yards: Front measured to street centerline or planned line; side/rear 5 ft; building spacing and access court widths specified. See § 21.32.070.
  • Parking: See Chapter 21.76 and Parking. § 21.32.080.

R-3 — Multi-Family Residential

• Purpose: Higher-density multi-family in unincorporated areas. Listed in § 21.16.010.
• Typical permitted uses: Any combination of single-, two-, or multi-family dwellings up to 25 du/net acre when on public sewer/water (subject to additional standards below). See § 21.36.020.
• Key dimensional standards:
  • Lot coverage: 70% max. See § 21.36.060.
  • Yards: Front via centerline or planned line; side/rear 5 ft; specified building spacing standards. See § 21.36.070.
  • Parking: See Chapter 21.76 and Parking. § 21.36.080.
  • Objective design standards may apply to new buildings. See § 21.36.090 and Design Review.
  • Sites rezoned to R-3 after Jan. 8, 2026 carry minimum density 20 du/ac and restrict single-family replacements/variances. See § 21.36.100.

M-U — Mixed Use

• Purpose: Integrates residential (R-3) and commercial (C-2) use sets with tailored standards. See § 21.58.020–.040.
• Typical permitted uses: All uses allowed in C-2 and R-3 (by cross-reference). See § 21.58.030.
• Key dimensional standards:
  • Height: 75 ft max; street-visibility fence controls. See § 21.58.050(A).
  • Building site area and lot coverage: No minimums; must meet all other applicable development and design standards. See § 21.58.050(B).
  • Residential density: Up to 25 du/net acre with public sewer/water, per a formula (two units per first 4,000 sq ft and one per each additional 1,500 sq ft, capped at 25 du/ac). See § 21.58.050(B)(3).
  • Yards: Fronts use the centerline/planned-line method; truck loading must not spill into public streets. See § 21.58.050(C)(1).

C-1 — Neighborhood Commercial

• Purpose: Neighborhood-serving retail/services in unincorporated areas; referenced as the standard for SCP’s neighborhood commercial. See § 21.52 (referenced) via § 21.66.030(B)(5). Detailed C-1 standards were not retrieved.
• Typical permitted uses and key dimensional standards: Not found in retrieved materials.

C-2 — General Commercial

• Purpose: Broader retail/commercial in unincorporated areas. Listed in § 21.16.010; detailed standards in Chapter 21.56.
• Typical permitted uses: Not found in retrieved materials. Use permits include large retail (≥65,000 sq ft), certain light assembly/manufacturing, larger emergency shelters, and limited commercial cannabis retail/testing subject to cross-references. See § 21.56.030.
• Key dimensional standards: Height 75 ft max (buildings) with sign-height rules; yard and lot/site area standards vary by residential vs. commercial use and must satisfy general standards and off-street parking. See § 21.56.040 and Chapters 21.08 and 21.76; also see Signage.

PI — Planned Industrial

• Purpose: Industrial districts governed by an adopted development plan; consistent with the General Plan and, if inside a city’s sphere, coordinated with that city’s standards where consistent. See § 21.42.010–.020 and § 21.42.050(G).
• Typical permitted uses: A detailed list includes ambulance/armored car, animal hospitals, bottling, contractor yards, machine shops, food processing, mini-warehouses, etc., all tied to an adopted PI development plan. See § 21.42.020.
• Key dimensional standards:
  • Landscaping: ≥5% of parcel; underground utilities; 8-ft masonry wall where abutting res/ag zones unless waived; on-site parking rate for warehouses/manufacturing (1/1,000 sq ft if unknown employees); consistency with county/city standards. See § 21.42.050.
  • Height: 35 ft max; front/corner yards ≥15 ft; loading must not rely on public right-of-way. See § 21.42.060–.080.
  • Building coverage: 70% max. See § 21.42.050(J).
  • Minimum building site area: 6,000 sq ft (sewer/water), 20,000 sq ft (one public utility), 1 acre (well/septic). See § 21.42.070.
• Process notes: Development plan content and amendment procedures are specified; substantial changes require new zoning action. See § 21.42.040–.050, § 21.42.090–.100.

IL — Light Industrial (sometimes shown as “LI” in text tables)

• Purpose: Light industrial/manufacturing, warehousing, offices/assembly; performance-oriented to limit impacts. See § 21.62.010 and § 21.62.020.
• Typical permitted uses: Crop farming/horticulture; assembly; bottling; R&D; warehousing and distribution; software development; parcel delivery; public safety/infrastructure; electronic repair/assembly; manufacturing/technology support. See § 21.62.020(B).
• Key dimensional standards: Minimum lot area 2 acres; minimum building size 25,000 sq ft; setbacks 15 ft front/10 ft sides/15 ft rear; site coverage 50% max; height 45 ft max; enhanced setbacks on specified West Patterson roadways. See § 21.62.040 and notes.
• Exceptions and prohibited uses: An exception process exists; a long list of prohibited uses (e.g., medical offices, auto sales/repair, schools, shopping centers) is codified. See § 21.62.050–.060.

IBP — Industrial Business Park

• Purpose: Business-park format with performance/landscaping standards; the chapter references the West Patterson master plan area. See § 21.61.040–.050.
• Typical permitted uses: Not found in retrieved materials; performance standards (air, glare/heat, vibration, odor) apply to operations. See § 21.61.110.
• Key dimensional standards: Minimum lot area 5 acres; minimum building size 50,000 sq ft; setbacks 15 ft front/10 ft sides/15 ft rear; site coverage 50% max; height 45 ft; enhanced setbacks on specified West Patterson corridors. See § 21.61.040 and notes.

P-D — Planned Development

• Purpose: Flexible, master-planned zoning for larger integrated projects; allows modification of conventional standards under an approved development plan. See § 21.40.010–.020.
• Typical permitted uses: All uses consistent with the General Plan are allowed if approved in the P-D development plan. See § 21.40.040.
• Key dimensional standards: Set by the development plan; sewer/water connection is mandatory where available (with package plants possible if sewer is not available). See § 21.40.030, § 21.40.050.
• Process notes: Development schedules, amendments, map numbering, and noncompliance remedies are specified. See § 21.40.080–.120.

S-P — Specific Plan

• Purpose: Zoning that implements an adopted County specific plan; permitted uses and standards are those of the adopted plan. See § 21.38.020–.040.
• Key note: S-P zoning is adopted/changed via the same process as zoning amendments, concurrent with or after specific plan adoption; numbered on the map. See § 21.38.040–.050.

HS — Historical Site District

• Purpose: Support and enhance the character of historical areas/structures; enables consideration of historic integrity during alterations/additions and allows special administrative flexibility where life-safety is maintained. See § 21.44.010; coordinate early with Historic Preservation.

SCP — Salida Community Plan District (with subzones)

• Purpose: Implements the Salida Community Plan with flexible, master-planned standards and nine subzones: SCP-R-1, SCP-R-1-ST, SCP-R-2, SCP-R-3, SCP-C-1, SCP-C-2, SCP-PI, SCP-IBP, SCP-A-2. See § 21.66.010–.020.
• How it works: Each SCP subzone generally follows its base district (e.g., SCP-R-1 follows R-1) with tables that modify height, lot coverage, and setbacks and allow some flexibility through nonlegislative development plans. See § 21.66.030(B) and subparagraphs.
• Caps and Williamson Act: Residential units in SCP-R-1/R-2/R-3 are capped at 5,000 total; Williamson Act lands within SCP remain under A-2 restrictions for the contract term. See § 21.66.030(A), (C).

H-1 — Highway Frontage; M — Industrial; LM — Limited Industrial; US — Urban Service

• Purpose, permitted uses, and dimensional standards: Not found in retrieved materials. All are listed among established districts. See § 21.16.010; verify current code chapters for these districts with the jurisdiction.

Accessory Dwelling Units (ADUs) in residential and agricultural districts

• ADUs/JADUs are permitted in all residential zones (R-1, R-2, R-3, R-A, M-U) and in A-2 (with siting limits to protect agricultural operations), plus any P-D that permits residential uses. Development standards include a 4-ft side/rear setback for new detached ADUs, parking exceptions, and density treatment. See § 21.74.020–.040; also see California housing laws and California ADU law for state preemption context.

Selected standards at a glance (unincorporated areas)

Additional requirements like parking, landscaping, signage, and design review may apply across districts—cross-check Parking, Landscaping and Screening, Signage, and Design Review. Where building code issues arise, they are addressed by the California Building Standards Code, separate from zoning.

Checklist

• Confirm your parcel’s zoning on the official County zoning map and whether any overlays apply (e.g., HS, SCP). See § 21.16.020.
• Identify whether your use is permitted by right or requires a use permit in your district (e.g., A-2 Tier One/Two uses; C-2 large-format retail; PI development plan). § 21.20.030; § 21.56.030; § 21.42.020.
• Verify key dimensional standards: height, lot coverage, building site area, setbacks, and any special measurement rules (front yard via centerline/planned line). See district chapters and § 21.12.640–.660.
• Check cross-cutting standards: Parking (Chapter 21.76), Design Review or objective design standards if flagged, Landscaping and Screening, and Signage.
• If proposing an ADU, confirm allowances and any A-2-specific siting limits. § 21.74.020–.040.
• If in P-D, PI, S-P, or SCP, obtain or consult the applicable development/specific plan and confirm its standards, phasing, and amendment process. § 21.40; § 21.42; § 21.38; § 21.66.
• Where a standard is unclear or absent here, Verify with the jurisdiction (Planning and Community Development).

Risks & Ambiguities

Plain-English Summary

In unincorporated Stanislaus County, your zoning district sets what you can build and how big/tall it can be. Neighborhoods like R-1/R-2/R-3 have height, lot coverage, and setback rules; A-2 prioritizes agriculture with tiered use permits for processing/support uses; business parks/industry use IBP/IL/PI with their own parcel sizes, setbacks, landscaping, and performance standards. Many areas also follow special plans like P-D, S-P, or SCP. Always check the official zoning map, confirm your district’s permitted uses and development standards, and then layer in parking, landscaping, signage, and any design review.

Source References

• Title 21 adoption and purpose: § 21.04.010–.030.
• District roster and map adoption: § 21.16.010–.020.
• Yard definitions and measurement: § 21.12.640–.660 (and related measurement rule).
• A-2 agriculture: § 21.20.020 (partial), § 21.20.030.
• R-A: § 21.24.030–.090.
• R-1: § 21.28.030–.060.
• R-2: § 21.32.060–.080.
• R-3: § 21.36.020; § 21.36.060–.100.
• M-U: § 21.58.020–.050.
• C-2: § 21.56.030–.040.
• PI: § 21.42.010–.080; § 21.42.050–.070.
• IL/LI: § 21.62.010–.060.
• IBP: § 21.61.040–.050; § 21.61.110.
• P-D: § 21.40.010–.120.
• S-P: § 21.38.020–.050.
• SCP: § 21.66.010–.030.
• HS: § 21.44.010.
• ADUs: § 21.74.020–.050.

Information Gaps

• R-A and R-1/R-2/R-3 complete “permitted uses” lists: Not found in retrieved materials.
• C-1 (Neighborhood Commercial), H-1 (Highway Frontage), M (Industrial), LM (Limited Industrial), US (Urban Service) detailed standards: Not found in retrieved materials.
• A-2 dimensional standards (setbacks, height beyond general references): Not found in retrieved materials.
• IBP permitted-use list: Not found in retrieved materials.
  For any of the above, Verify with the jurisdiction.

Retrieved passages

• Stanislaus County Zoning Code (§ 21.61.040.) High relevance show source text
• Stanislaus County Zoning Code (Title 20) High relevance show source text
• Stanislaus County Zoning Code (§20) High relevance show source text
• Stanislaus County Zoning Code (§3) High relevance show source text
• CBC § 1 (§1) High relevance show source text
• Stanislaus County Zoning Code (§4) High relevance show source text
• Stanislaus County Zoning Code (§ 21.62.050.) High relevance show source text
• Stanislaus County Zoning Code (title for) High relevance show source text
• Stanislaus County Zoning Code (§1) Medium relevance show source text
• CFC § 20 (chapter and) Medium relevance show source text
• Stanislaus County Zoning Code (§20) Medium relevance show source text
• Stanislaus County Zoning Code (§3) Medium relevance show source text
• Stanislaus County Zoning Code (§ 21.62.040.) Medium relevance show source text

Cited sections

• Title 21 adoption and purpose: **§ 21.04.010–.030**. (Title 21)
• District roster and map adoption: **§ 21.16.010–.020**. (§ 21.16.010)
• Yard definitions and measurement: **§ 21.12.640–.660** (and related measurement rule). (§ 21.12.640)
• A-2 agriculture: **§ 21.20.020 (partial), § 21.20.030**. (§ 21.20.020)
• R-A: **§ 21.24.030–.090**. (§ 21.24.030)
• R-1: **§ 21.28.030–.060**. (§ 21.28.030)
• R-2: **§ 21.32.060–.080**. (§ 21.32.060)
• R-3: **§ 21.36.020; § 21.36.060–.100**. (§ 21.36.020)
• M-U: **§ 21.58.020–.050**. (§ 21.58.020)
• C-2: **§ 21.56.030–.040**. (§ 21.56.030)
• PI: **§ 21.42.010–.080; § 21.42.050–.070**. (§ 21.42.010)
• IL/LI: **§ 21.62.010–.060**. (§ 21.62.010)
• IBP: **§ 21.61.040–.050; § 21.61.110**. (§ 21.61.040)
• P-D: **§ 21.40.010–.120**. (§ 21.40.010)
• S-P: **§ 21.38.020–.050**. (§ 21.38.020)
• SCP: **§ 21.66.010–.030**. (§ 21.66.010)
• HS: **§ 21.44.010**. (§ 21.44.010)
• ADUs: **§ 21.74.020–.050**. (§ 21.74.020)
• StanislausCounty_ZoningCode.md

• Official Stanislaus County code library