Santa Clara County — Signage

Last reviewed: July 6, 2026

Overview

This page explains how the Santa Clara County Zoning Ordinance regulates signs in unincorporated areas. The County’s sign rules live in Chapter 4.40 of the Zoning Ordinance and are augmented by overlay districts (notably the -sr Scenic Roads and -h Historic Preservation combining districts) and by the Architecture and Site Approval (ASA) process. If your project also triggers other rules (setbacks, landscaping, or design review), see the County-wide context in the zoning & planning overview, Santa Clara County Zoning, Santa Clara County Development Standards, and Santa Clara County Design Review.

Most new or changed signs in unincorporated areas require Architecture and Site Approval unless specifically exempted. Check § 4.40.020 and the ASA triggers in § 5.40.020(C).

Countywide sign framework (applies in all base districts unless a more specific rule overrides)

• Purpose and scope: Chapter 4.40 aims to reduce visual clutter, protect safety, and promote attractive signage. Indoor and incidental visitor-serving wayfinding (e.g., restrooms, parking) at public-facing facilities are not regulated under this chapter (§ 4.40.010) .
• Review: New signs or major changes typically need ASA (§ 4.40.020; ASA trigger for “new or major changes in signs” § 5.40.020(C)) .
• Illumination: Allowed lighting types are limited; lighting must be continuous (non-blinking). Fin signs may only be externally lit (§ 4.40.040; § 4.40.050(F)(1)(d)) .
• Construction and maintenance: Secure construction is required; rust, peeling paint, graffiti, burned-out bulbs, and dangling parts must be promptly addressed (§ 4.40.030) .
• Sign area measurement: Methods for regular/irregular shapes, multiple message surfaces, and 3D signs are defined (§ 4.40.120) .
• Nonconforming signs: Limits on alteration; removal required after prolonged vacancy, cessation of use, blank message >6 months, or if >50% replacement cost needed (§ 4.40.130) . For general nonconformity context, see Santa Clara County Nonconforming Uses.

Key sign types and standards

• Attached signs (nonresidential uses requiring discretionary approval): Quantity and size scale with occupancy frontage; height limited to below the third-floor finished floor; setbacks increase near residential; detailed rules for fin, awning, window, and marquee signs (§ 4.40.050) .
• Freestanding signs (nonresidential uses requiring discretionary approval): Counts based on street frontage; area scales with lot frontage; area and height caps; setbacks and landscaped base required; segmented signs limited; optional time/temperature component allowed (§ 4.40.060) .
• “Other signs” allowed in any base district: Small informational name signs up to 4 sf, and on-premises for-sale/lease signs up to 8 sf allowed by right; certain public/quasi-public directional signs and subdivision sale signs may be approved via ASA (§ 4.40.070) .
• Political signs: Permitted in all districts with limits (e.g., in R1, R1E, RHS, R1S, R2: up to 16 sf; 32 sf on a vacant lot), and must be removed within 10 days after the election (§ 4.40.100(B)) .
• Agricultural sales and winery signs: Up to 6 total signs (including up to 2 off-site); max 64 sf per sign; cumulative 128 sf; max height 12 ft; maintenance/legibility rules; AVA wayfinding allowance; alternatives can be approved through ASA or other discretionary permits depending on scale (§ 4.40.110) .
• Master Sign Program (MSP): Required for multiple-occupancy buildings or sites within a city’s urban service area; may be required elsewhere by the approval authority; reviewed via ASA (§ 4.40.080) .

District-by-district signage notes (unincorporated areas)

Residential districts — R1, R1E, RHS, R1S, R2

• Purpose of these rules: Limit visual impacts in neighborhoods.
• What’s typically allowed: By right, small informational name signs (4 sf) and for-sale/lease signs (8 sf) (§ 4.40.070(A)) . Political signs are permitted with size limits noted above (§ 4.40.100(B)) .
• Key dimensional standards: See Political sign limits (16 sf; 32 sf on a vacant lot) (§ 4.40.100(B)(2)) .
• Where it applies: All residentially zoned parcels in unincorporated County.

Neighborhood Commercial — CN

• Purpose of these rules: Provide pedestrian-oriented storefront visibility while preventing clutter.
• Typical occupancies: Ground-floor retail and services that commonly need storefront/window signage.
• Key dimensional standards:
  • Window signs: Total permanent + temporary window signage limited to 25% of the window frame area; CN uniquely allows first- and second-floor window signs where other districts limit window signs above the first floor (§ 4.40.050(H)) .
  • Attached sign sizing and count: One square foot per linear foot of occupancy frontage up to 300 sf; quantity increases allowed for large tenants; second-story signs at half the first-floor allowance (§ 4.40.050(B)-(C)) .
• Where it applies: CN-zoned sites in unincorporated areas subject to these attached/window sign standards.

Office Administrative — OA

• Purpose: Maintain a subdued office character.
• Key prohibition: Marquees are not allowed (§ 4.40.050(I)(2)) .
• Other standards: Attached/freestanding sign rules for nonresidential uses still apply where a discretionary approval is required (§ 4.40.050; § 4.40.060) .

Industrial — ML and MH

• Purpose: Provide identification while limiting large freestanding signs along industrial corridors.
• Key dimensional standard: Freestanding sign area capped at 40 sf in both ML and MH (§ 4.40.060(C)(5)) .
• Other freestanding rules: Front/side/rear setbacks, height formula, landscaping at base, and segmentation limits apply (§ 4.40.060(D)-(F)) .

Scenic Roads Combining District — -sr

• Purpose: Protect scenic corridors with stricter sign controls (§ 3.30.010) .
• When it applies: Any parcel signed with an “-sr” suffix; see the Scenic Roads inventory (§ 3.30.050) .
• Design review/setbacks: Any structure, including signs, within 100 ft of a designated scenic road (other than US 101) requires design review (§ 3.30.030(A)); also, no signs within 100 ft of US 101 right-of-way (§ 3.30.030(C)) .
• Number: One on-site advertising sign per lot, plus one sale/lease sign, with limited exceptions (§ 3.30.040(A)) .
• Size:
  • General: 16 sf max for most signs (outside the US 101 buffer and excluding ag/winery signs) (§ 3.30.040(B)(2)) .
  • Within 1,000 ft of US 101: 50 sf area and 20 ft height; up to 100 sf with a special permit (§ 3.30.040(B)(3)) .
  • Ag/winery signs: Follow § 4.40.110(B)(2) area limits (§ 3.30.040(B)(1)) .
• Design: Signs must remain stationary; illumination must be stationary/constant (§ 3.30.040(C)) .
• Special carve‑outs: Subdivision directional signs are not permitted in -sr (§ 4.40.090(A)) . For combined rules and other overlays, see Santa Clara County Overlay Districts.

Historic Preservation Combining District — -h

• Purpose: Preserve historic character; the County may require removal/modification of incompatible outdoor uses and outdoor advertising signs (§ 3.50.050(C)) .
• Standards: The Board may adopt special district standards that supersede base-district rules, including signs (§ 3.50.060(A)-(B)) . Always check Santa Clara County Historic Preservation.

Stanford University lands (exemption)

• Exemption: Except for any residential signage in R1S and R3S, Chapter 4.40 does not apply to development on Stanford lands (§ 4.40.140) .
• Verify applicability for any parcel within the Stanford Community Plan area (parcel‑specific).

Decision-relevant standards at a glance

Practical guidance

• Start with your site’s base zoning and overlays via Santa Clara County Zoning and Santa Clara County Overlay Districts. Scenic (-sr) and historic (-h) overlays can radically change what’s allowed (§ 3.30; § 3.50) .
• If your use needs discretionary approval, expect to follow the attached/freestanding standards and possibly an MSP for multi-tenant sites (§ 4.40.050–.060; § 4.40.080) .
• Freestanding signs require a landscaped base; coordinate with Santa Clara County Landscaping and Screening (§ 4.40.060(F)(2)) .
• In CN, window sign flexibility is better than in other districts; in OA, avoid marquees (§ 4.40.050(H); § 4.40.050(I)(2)) .
• Near US 101 and designated scenic roads, size and height caps are stricter, and proximity may trigger Santa Clara County Design Review (§ 3.30.030-.040) .

Checklist

• Confirm parcel is in unincorporated Santa Clara County and identify base zoning and overlays (-sr, -h, etc.).
• Determine if your use requires discretionary approval; if so, apply § 4.40.050 (attached) and/or § 4.40.060 (freestanding).
• Calculate allowable sign area using occupancy frontage (attached) or street frontage (freestanding) and § 4.40.120 computation rules.
• Check special district rules: CN window signage flexibility; OA marquee prohibition; ML/MH 40 sf freestanding cap.
• If within a city’s urban service area and multi-tenant, prepare a Master Sign Program (§ 4.40.080).
• If in -sr, apply the stricter number/size/design limits; verify US 101 buffers and design review triggers.
• Verify ASA is required or if your sign is an allowed “Other sign” or political sign under § 4.40.070 or § 4.40.100.
• For subdivision directional signs, plan for ASA, time limits, and height/area caps; if >6 ft, account for building permit requirements (see California Building Standards Code) (§ 4.40.090) .

Risks & Ambiguities

Plain-English Summary

If you’re adding or changing a sign in unincorporated Santa Clara County, expect to seek ASA unless your sign is a small, by-right informational/real-estate sign or a political sign. How big and how many signs you can have depends on your frontage and district, with stricter rules near scenic roads and unique tweaks in certain zones (e.g., CN window signs; OA no marquees; ML/MH smaller freestanding signs). Always confirm overlays and frontage measurements early to avoid redesigns.

Source References

• Santa Clara County Zoning Ordinance, Chapter 4.40 Signs — Purpose, Review, Construction/Maintenance, Illumination, Attached signs, Freestanding signs, Other signs, Master Sign Program, Subdivision Directional, Political, Agricultural/Winery, Computation, Nonconforming, Stanford Exemption, Definitions (§ 4.40.010–.150) .
• Scenic Roads Combining District (-sr): Purpose, applicability, design review, signs, US 101 rules, scenic road list (§ 3.30.010–.050) .
• Historic Preservation Combining District (-h): Outdoor advertising sign compatibility; special standards may supersede base district (§ 3.50.050–.060) .
• ASA Procedure and applicability (including “new or major changes in signs”) (§ 5.40.010–.040) .

Retrieved passages

• Santa Clara County Zoning Code (§ B17-68) High relevance show source text
• Santa Clara County Zoning Code (§ 4.40.070.) High relevance show source text
• Santa Clara County Zoning Code High relevance show source text
• Santa Clara County Zoning Code (§ 4.40.060.) Medium relevance show source text
• Santa Clara County Zoning Code (§ 7) Medium relevance show source text
• CBC § 4.40.090 (Chapter 5.40.) Medium relevance show source text
• Santa Clara County Zoning Code (section via) Medium relevance show source text
• CBC § 14 (Chapter II) Medium relevance show source text
• Santa Clara County Zoning Code (§ 10) High relevance show source text
• Santa Clara County Zoning Code (Section 4.40.050) Medium relevance show source text
• Santa Clara County Zoning Code (§ 4.40.060.) Medium relevance show source text
• Santa Clara County Zoning Code (§ 4.40.070.) Medium relevance show source text
• Santa Clara County Zoning Code (§ 3) Medium relevance show source text

Cited sections

• Santa Clara County Zoning Ordinance, Chapter 4.40 Signs — Purpose, Review, Construction/Maintenance, Illumination, Attached signs, Freestanding signs, Other signs, Master Sign Program, Subdivision Directional, Political, Agricultural/Winery, Computation, Nonconforming, Stanford Exemption, Definitions (§ 4.40.010–.150) . (Chapter 4.40)
• Scenic Roads Combining District (-sr): Purpose, applicability, design review, signs, US 101 rules, scenic road list (§ 3.30.010–.050) . (§ 3.30.010)
• Historic Preservation Combining District (-h): Outdoor advertising sign compatibility; special standards may supersede base district (§ 3.50.050–.060) . (§ 3.50.050)
• ASA Procedure and applicability (including “new or major changes in signs”) (§ 5.40.010–.040) . (§ 5.40.010)
• SantaClaraCounty_ZoningCode.md

• Official Santa Clara County code library