Santa Clara County, CA Accessory Structures: ADU Owner Occupancy (2026)
Key Facts
- Applies to
- Junior ADUs only
- Owner may live in
- House or the JADU
- Exempt owners
- Agency, land trust, housing org
- Standard ADUs
- No owner-occupancy rule
Summary
Unincorporated Santa Clara County requires an owner to live in either the main house or the junior ADU whenever a junior accessory dwelling unit is added: standard ADUs carry no such requirement.
Owner-occupancy of one unit is required in any single-family residence that contains a junior accessory dwelling unit. The owner may reside in either the single-family residence or the junior accessory dwelling unit. Owner-occupancy shall not be required if the owner is a governmental agency, land trust, or housing organization.
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
Under the county's zoning ordinance, a single-family residence in unincorporated Santa Clara County that adds a junior accessory dwelling unit must have an owner occupying either the primary residence or the JADU itself: occupancy of the other unit by a tenant is fine, but the owner can't be absent from both. Government agencies, land trusts, and housing organizations that hold title to a JADU property are exempt from the requirement. Standard (non-junior) ADUs carry no county owner-occupancy condition.
Violations & Fines
Not a criminal offense; enforced through code compliance review tied to the JADU's building permit and legal-unit status, risking abatement of the JADU.
Frequently Asked Questions
Does the owner-occupancy rule apply to a standard ADU in unincorporated Santa Clara County?
Who is exempt from owner-occupancy for a JADU?
Sources & Official References
Other rules in Santa Clara County
California rules heatmap·Compare Santa Clara County to another location·View the California accessory structures overview
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