California ADU rules
California ADU Rules Directory
Use these city summaries as a starting point for local ADU research. Always confirm the current standards, submittal requirements, utilities, fire access, and overlays directly with the local departments.
What this directory is
A California-focused index of city ADU starting points, official links, local notes, and questions to ask before relying on a design.
How to use local ADU rules
Confirm jurisdiction first, then compare detached ADU, attached ADU, garage conversion, and JADU paths with local objective standards.
Why jurisdiction matters
A mailing city, county service area, or neighborhood name may not identify the planning department that controls the parcel.
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Questions to ask before relying on any rule summary
- Which department confirms the parcel is inside city limits?
- Which ADU standards apply to the specific project type?
- What setbacks, height, size, lot coverage, parking, and utility rules need review?
- Do fire, hillside, coastal, historic, HOA, or public works conditions affect the property?
TinyHomeNavigator provides educational information only. Rules vary by parcel, zoning district, city, county, overlay, utility provider, fire authority, and environmental health department. Always confirm directly with the local planning department, building department, environmental health department, fire authority, and utility providers before buying land, designing, permitting, placing, or building any structure.