Santa Clara County, CA Building Safety: Building Permits (2026)
Key Facts
- Exempt from review
- Additions up to 1,000 sq ft
- Administrative review
- 1,001-2,000 sq ft additions
- Full design review
- Over 2,000 sq ft
- Applies to
- Unincorporated county only
Summary
Building additions in unincorporated Santa Clara County skip design review under 1,000 square feet, get administrative review from 1,001 to 2,000 square feet, and need full review above that.
The following types of buildings and structures may, at the discretion of the Zoning Administrator, be considered minor and eligible for design review administrative approval or a discretionary exemption from the design review process...A.Additions to existing buildings and structures, including attached carports, arbors, and similar unenclosed structures, where new floor area is between 1,001 and 2,000 square feet;B.Detached buildings, and structures with floor area between 1,001 and 2,000 square feet.
Official source re-checked September 7, 2026: no newer edition of the code had been published (publisher’s edition: Code of Ordinances: Supplement 65).
Full Breakdown
Zoning Ordinance § 5.50.050(A) exempts additions to an existing building from the county's design review process entirely when the new floor area is 1,000 square feet or less. Once new floor area reaches 1,001 to 2,000 square feet, § 5.50.060(A) shifts the project into administrative design review or a discretionary exemption, granted by the Zoning Administrator without a public hearing based on the property's visibility and potential visual impact. Additions beyond 2,000 square feet fall outside both exemptions and go through the county's standard design review procedure under §§ 5.50.020-5.50.040. Purely interior remodels that add no floor area are not addressed by this design review chapter and still require the applicable state-code building permit.
Violations & Fines
Constructing an addition without the design review level required by § 5.50.050/§ 5.50.060 can result in a stop-work order; general Ordinance Code violations are misdemeanors punishable by up to $1,000 per day under Sec. A1-28.
Frequently Asked Questions
Does adding a small room addition need county design review?
What if my addition is 1,500 square feet?
Sources & Official References
Other rules in Santa Clara County
California rules heatmap·Compare Santa Clara County to another location·View the California building safety overview
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