Antioch, CA Building Setbacks & Zoning: Setback Rules (2026)

601 table replaces a flat front-yard number with a graduated scale tied to street classification, reserved for landscaping rather than driveways: for single-family detached and two-family homes, an arterial-street frontage needs a 30-foot setback with 30 feet of landscaping, a collector street needs 25 feet of front setback plus a 10-foot street-side setback, and a local street needs a 20-foot front setback plus a 10-foot street-side setback. Multi-family projects get shorter setbacks: 15 feet on arterial and collector streets and 10 feet on local streets.

Side yards are governed separately by footnote (e): for at least 25% of the lots in a subdivision, one interior side yard must be 10 feet wide and kept as unrestricted open area, while the other side can be as narrow as five feet; the rule also applies to every two-story single-family lot regardless of subdivision percentage. A narrow-lot exception lets pre-1950 parcels under one ownership, averaging less than 50 feet wide, reduce each side yard to 10% of the parcel's width, though never below three feet.

Footnote (k) adds a garage-specific rule: no garage in a residential district may sit closer than 20 feet from the street property line it faces, regardless of the yard setback otherwise required. 602 lets that nonconforming setback carry over into an expansion, provided lot coverage and all other setbacks still comply.