Antioch, CA Sign Regulations: Freeway-Facing Signs (2026)
Key Facts
- Max height
- 25 ft (up to 45 ft if elevated)
- Freeway proximity
- Within 300 ft of freeway ROW
- Content limit
- Must name owner/occupant of site
- Setback
- 20-ft building setback still applies
- Enforcement
- Dept. of Development Services approval
Summary
Antioch bars roof or freestanding signs built for freeway exposure unless they identify the owner or occupant of the site, per AMC § 9-5.508(C). A qualifying sign within 300 feet of an existing or adopted freeway right-of-way needs no minimum street-frontage footage, but its height is capped at 25 feet, or up to 45 feet if elevated, whichever is less.
(C) Freeway-oriented signs.
(1) No roof or freestanding sign may be constructed, placed, designed, or used for freeway exposure, except to designate the name of the owner or occupant of the premises upon which it is located or to identify such premises. A sign with no minimum footage requirement may be erected to be viewed primarily by persons traveling on such freeway when such sign is within 300 feet of any existing or adopted freeway right-of-way. However, the sign shall comply with the provisions of division (B)(1)(a) of this section. The maximum height shall be 25 feet.
(2) In no event shall elevated freeway signs exceed a height of more than 25 feet above the freeway grade, measured at such freeway center line, or a maximum height of 45 feet from ground level, whichever is less.
Full Breakdown
508 of the Antioch Municipal Code sets the citywide general regulations for signs, billboards, and advertising structures, and division (C) singles out freeway-oriented signs. The default rule for freestanding signs elsewhere in the city, division (B), requires at least 150 lineal feet of street frontage and a 20-foot building setback before a freestanding sign is even allowed. Division (C) waives that frontage minimum for a sign built to be viewed primarily by freeway travelers, but only if the sign sits within 300 feet of an existing or adopted freeway right-of-way and still meets the 20-foot setback rule carried over from division (B)(1)(a).
Height is capped at 25 feet under the base freestanding-sign rule referenced in (C)(1); elevated freeway signs get a narrower allowance under (C)(2): no more than 25 feet above the freeway's own grade at its center line, or 45 feet measured from the ground, whichever number is lower. Any sign erected for freeway exposure that is not an owner or occupant identification sign is flatly prohibited, regardless of height or setback. 508, administered by the Department of Development Services. 515(C), which governs off-site advertising structures over 50 square feet and applies a 500-foot freeway-proximity test instead of 300 feet.
Violations & Fines
Erecting or maintaining a freeway-oriented sign without the location, size, and design approval required by § 9-5.508 violates the Antioch Municipal Code. Under the citywide general penalty at § 1-2.01, any code violation is a misdemeanor unless the City Attorney exercises discretion to charge it as an infraction, and a violation is independently declared a public nuisance subject to abatement, with each day of continuation a separate offense.
Frequently Asked Questions
Can I put up a sign in Antioch just to be seen from Highway 4?
How tall can an elevated freeway sign be in Antioch?
Do I need city approval before building a freeway-facing sign?
Sources & Official References
Other rules in Antioch
California rules heatmap·Compare Antioch to another location·View the California sign regulations overview
See something wrong?
Help us keep this page accurate. If you notice an error or outdated information, let us know.
Freeway-Facing Signs in Nearby Cities
How other cities in Contra Costa County handle freeway-facing signs.