Santa Clara County — Development Standards

Last reviewed: July 6, 2026

Overview

This page distills the development standards that apply in the unincorporated areas of Santa Clara County under the County’s Zoning Ordinance. It focuses on setbacks, height, lot coverage, density, and related dimensional rules by base district and key combining districts/overlays. For a fuller context on how these rules fit with allowed uses and procedures, see the County’s zoning, land use, parking, design review, and overlay districts guides.

Setbacks along public streets in unincorporated areas are measured from the edge of the ultimate road right-of-way, not from the current curb or pavement edge. See § 2.40.030.C.1.

How to read this page

• Article 2 of the County Zoning Ordinance contains base districts and their property development standards (minimum lot size, setbacks, height, etc.). Combining districts in Article 3 can supersede base standards. Supplemental standards in Article 4 add special rules (e.g., accessory buildings, fencing). § 1.20.010–.020 (Article map) and cross-references explain this structure.
• Where a combining district applies, its rules prevail over the base district for the same topic. § 1.20.010(D).

Urban Residential Base Districts (Article 2.30)

The County’s urban residential base districts in unincorporated areas are: R1, R1E, RHS, R1S, R3S, R2, and R3. The table below summarizes the dimensional standards from Table 2.30-3. Use classifications are in § 2.30.020. § 2.30.030; § 2.30.020.

Quick-reference standards: Urban Residential

Notes:

• In R3, density must conform to the applicable city general plan on county islands (Note 3). § 2.30.030.
• On properties fronting designated scenic roads, the front setback is typically 100 ft in urban residential districts (see “Scenic road” row). § 2.30.030 (Table 2.30-3).
• In R3S, and for multi-family in R1S, side/rear setbacks and heights can be adjusted through Architecture & Site Approval (ASA) to ensure buffering and compatibility. § 2.30.030 Notes 4–5.

Where these apply: These districts map to urbanized pockets of the unincorporated areas. Verify a parcel’s zoning designation on the County’s maps to confirm district and whether a combining district overlays it. § 1.20.010(D).

Commercial & Industrial Base Districts (Article 2.40)

The County’s commercial/industrial base districts include CN (Neighborhood Commercial), CG (General Commercial), OA (Administrative/Office), ML (Light Industrial), and MH (Heavy Industrial). Dimensional standards appear in Table 2.40-2; allowed uses and intent are in §§ 2.40.010–.020. § 2.40.030; § 2.40.010–.020.

• Setbacks listed in Table 2.40-2 apply only when a property is adjacent to, or across a street from, a residential district unless a setback is imposed through ASA. § 2.40.030.B.
• The Zoning Administrator may modify setbacks/height for ASA projects with justification. Table 2.40-2, Note 1.

Quick-reference standards: Commercial & Industrial

Where these apply: Neighborhood/commercial nodes and industrial enclaves in the unincorporated areas. Parcel-specific ASA conditions can supersede general setbacks/height. § 2.40.030 (Note 1).

Rural, Agricultural, and General-Use Districts (Article 2.20 and 2.50)

• A1 (General Use). Development standards are established in § 2.50.030; for nonresidential and ASA-residential projects, setbacks and height are set by the Zoning Administrator within stated limits. Rules of measurement mirror street-edge practices noted above. § 2.50.030(B)–(C).
• AR (Agricultural Ranchlands) and HS (Hillside). Standards are in §§ 2.20.030, 2.20.040, and related hillside/cluster provisions; specific numeric setbacks/height were not included in the retrieved excerpts. Not found in retrieved materials.

Where these apply: Sparsely developed unincorporated foothills, valleys, and open lands; parcel-by-parcel verification is essential. Verify with the jurisdiction.

Combining Districts and Special Overlays (Article 3)

Combining districts modify or supersede base-district development standards. Always check overlays on the zoning map.

• -n 2 (Burbank). Front setback 20 ft; FAR 0.50 (with defined exclusions for ADU floor area and certain urban primary units). § 3.40.040.
• -n 3 (Stanford: Upper San Juan). Front setback 30 ft; max lot coverage 20% for single-family and 35% for two-/multi-family; minimum frontage 100 ft for most subdivisions; 1 on-site parking space per two-/multi-family unit (supersedes general parking table). § 3.40.050(A)–(E).
• -n 5 (Cambrian Park). Front setback 25 ft; side setback 8 ft (corner exterior side 10 ft). § 3.40.070(A)–(B).
• -sr (Scenic Roads). Structures within 100 ft of designated scenic road rights-of-way require design review; Table 2.30-3 also shows a 100 ft front setback for many urban residential districts on scenic roads. § 3.30.030(A); § 2.30.030.
• -h (Historic Preservation). Establishes preservation-focused controls that can affect placement, massing, and exterior work. See the County’s Historic Preservation process. § 3.50.010–.020.
• -os (Housing Opportunity Sites). For parcels listed in the County’s housing inventory, the -os designator exempts projects from base-district FAR/lot coverage and applies special standards: typical setbacks 10 ft on all sides and heights from 135 ft to 270 ft by category; certain sites require a minimum 20 du/ac density to accommodate lower-income RHNA credits. § 3.75.030(A)–(D).

Where these apply: Only on mapped overlays in unincorporated areas; some standards at Stanford defer to the Stanford Community Plan/GUP. § 3.75.030 Notes; § 3.30.010.

Supplemental Development Standards (Article 4.20)

These rules apply in addition to base/combining district standards.

• Accessory buildings and structures (urban residential). Max height 12 ft and one story (ridge not above 16 ft with hip/gable allowance); must be in the rear half/rear yard or ≥75 ft from the front property line; keep ≥6 ft from any dwelling; cumulative accessory coverage ≤ 30% of the rear yard; side/rear setbacks per the California Building Standards Code for fire separation. § 4.20.020(D).
• Accessory buildings and structures (rural). If lot < 2.5 acres, height 12 ft (16 ft ridge with hip/gable allowance); if ≥2.5 acres, accessory building height up to 35 ft; taller rural accessory buildings (over 12/16 ft) require ≥30 ft side/rear setbacks. § 4.20.020(E).
• Development on substandard lots. A legally created lot down to 3,750 sf may be used as a residential building site if all other development standards are met; special setback exceptions are available. § 4.20.040(A)–(B).
• Fences (urban residential). Within 20 ft of the front lot line, max height 3 ft; elsewhere on the lot, fences may be 8 ft tall (special corner visibility limits apply). § 4.20.050(A).
• Rules of measurement. Setbacks next to streets are measured from the edge of the ultimate right-of-way; height measured per Chapter 1.30. § 2.40.030(C).

Related topics: See Signage for sign standards (especially along scenic roads), Nonconforming Uses for existing conditions, Variances and Exceptions for relief mechanisms, and Landscaping and Screening for planting/screening requirements. Table 2.40-2 and § 2.40.040 include commercial/industrial landscaping and outdoor storage screening rules.

Neighborhood-specific Development Standards (-n districts)

Several mapped neighborhoods in the unincorporated areas carry additional standards that supersede base rules:

• Burbank (-n 2): 20 ft front setback; 0.50 FAR cap (with specified ADU exclusions). § 3.40.040.
• Stanford: Upper San Juan (-n 3): 30 ft front setback; 20% lot coverage (single-family) / 35% (two-/multi-family); 100 ft minimum frontage (typical); on-site parking minimums of 1 space per unit for two-/multi-family (supersedes general residential parking). § 3.40.050(A)–(E).
• Cambrian Park (-n 5): 25 ft front; sides 8 ft (corner exterior 10 ft). § 3.40.070.

Nonconforming coverage in -n 3: limited enlargement and casualty-reconstruction allowances exist (e.g., +250 sf cap on expanding lot-coverage nonconformities) with strict conditions; other nonconformities defer to Chapter 4.50. § 3.40.050(F)–(H).

Special Housing Opportunity Sites (-os)

For parcels designated with -os, the base district’s FAR and lot coverage do not apply; instead, projects follow Table 3.75-2: typical 10 ft front/side/rear setbacks and maximum heights of 135 ft (UR), 150 ft (UV), or 270 ft (TR). Some sites must meet a minimum 20 du/ac to accommodate very low/low-income housing. Other quality-of-life design standards (e.g., private/open space, laundry, storage) also apply. § 3.75.030(A)–(D).

Stanford sites listed in the inventory defer to the Stanford Community Plan/GUP for height/setbacks/lot size. § 3.75.030(A) Note 3.

Checklist

• Identify the base zoning district (e.g., R1, R3, CN, ML) and pull the correct property development standards (setbacks, height, lot coverage). § 2.30.030; § 2.40.030.
• Confirm any combining district overlays (-n, -sr, -h, -os) and apply their standards if they supersede base rules. § 1.20.010(D); §§ 3.30, 3.40, 3.50, 3.75.
• Use the correct street-measurement line (edge of ultimate right-of-way) when laying out setbacks. § 2.40.030(C).
• For R1S/R3S or ASA projects, check if the Zoning Administrator may adjust setbacks/height. § 2.30.030 Notes 4–5; § 2.40.030 Note 1.
• If on a scenic road, account for the 100 ft front setback/design review triggers. § 2.30.030; § 3.30.030(A).
• If planning accessory structures, use § 4.20.020 limits (height, placement, separations).
• If the lot is substandard, confirm eligibility to develop (≥3,750 sf) and any setback exceptions. § 4.20.040.
• Check parking ratios and any overlay overrides (e.g., -n 3 one space/unit). § 3.40.050(E); § 2.40.030 (Table 2.40-2).
• If near historic resources, consult the -h rules. § 3.50.010–.020.

Risks & Ambiguities

Plain-English Summary

In unincorporated Santa Clara County, what you can build and where you can place it hinges on your base zoning district’s setbacks, height, and coverage rules, then any neighborhood or special overlay that supersedes those rules. Expect deeper front setbacks on scenic road frontages, special neighborhood standards in places like Burbank, Stanford’s Upper San Juan, and Cambrian Park, and accessory-structure rules that keep sheds and garages low and to the rear.

Source References

• Urban Residential development standards: § 2.30.030 (Table 2.30-3) and notes; use standards: § 2.30.020.
• Commercial/Industrial standards and rules of measurement: § 2.40.030 (Table 2.40-2); landscaping/outdoor storage: § 2.40.040.
• Combining districts (-n neighborhoods, Scenic Roads, Historic Preservation): §§ 3.40.040, 3.40.050, 3.40.070; § 3.30.030; §§ 3.50.010–.020.
• Housing Opportunity Sites (-os): § 3.75.030 (Table 3.75-2 and standards).
• Accessory buildings, substandard lots, fences: §§ 4.20.020, 4.20.040, 4.20.050.
• How the ordinance is organized and combining-district primacy: § 1.20.010–.020.

Retrieved passages

• Santa Clara County Zoning Code (Section 1.30.030) High relevance show source text
• Santa Clara County Zoning Code (§ 65583.2) High relevance show source text
• Santa Clara County Zoning Code (§ 2.30.030.) High relevance show source text
• Santa Clara County Zoning Code (Chapter 4.30) High relevance show source text
• CBC § 1.30.030 (Chapter 1.30) High relevance show source text
• Santa Clara County Zoning Code (ARTICLE 5) High relevance show source text
• Santa Clara County Zoning Code (Chapter 5.45) High relevance show source text
• Santa Clara County Zoning Code (§ 3.40.040.) High relevance show source text

Cited sections

• Urban Residential development standards: § 2.30.030 (Table 2.30-3) and notes; use standards: § 2.30.020. (§ 2.30.030)
• Commercial/Industrial standards and rules of measurement: § 2.40.030 (Table 2.40-2); landscaping/outdoor storage: § 2.40.040. (§ 2.40.030)
• Combining districts (-n neighborhoods, Scenic Roads, Historic Preservation): §§ 3.40.040, 3.40.050, 3.40.070; § 3.30.030; §§ 3.50.010–.020. (§ 3.40.040)
• Housing Opportunity Sites (-os): § 3.75.030 (Table 3.75-2 and standards). (§ 3.75.030)
• Accessory buildings, substandard lots, fences: §§ 4.20.020, 4.20.040, 4.20.050. (§ 4.20.020)
• How the ordinance is organized and combining-district primacy: § 1.20.010–.020. (§ 1.20.010)
• SantaClaraCounty_ZoningCode.md

• Official Santa Clara County code library