Sign Regulations in Antioch, CA (2026)
5 verified sign regulations for Antioch, California, sourced directly from the municipal code and official government pages.
Verified from official government sources
Political Signs
Political signs are protected non-commercial speech in Antioch. Residents may display signs on private property during and outside election seasons, subject to the same content-neutral size and placement rules as other yard signs. Civil Code §4710 protects political signs in HOAs.
Signs: Political Signs
Light RestrictionsCalifornia Civil Code Section 4710
(a) The governing documents may not prohibit posting or displaying of noncommercial signs, posters, flags, or banners on or in a member's separate interest, except as required for the protection of public health or safety or if the posting or display would violate a local, state, or federal law. (b) For purposes of this section, a noncommercial sign, poster, flag, or banner may be made of paper...
Garage Sale Signs
Antioch lets residents post garage and rummage sale signs in residential districts under AMC § 9-5.509(B)(2), but caps each sign at four square feet, restricts them to on-site placement, forbids attaching them to utility poles, fences, trees, or other vegetation, and requires removal within one day after the sale ends.
Antioch Garage Sale Sign Rules
Light RestrictionsAntioch Municipal Code § 9-5.509(B)(2) (Residential District Rummage and Garage Sale Signs)
(2) Residential district rummage and garage sale signs. The provisions of this article shall not be deemed to prohibit the fixing of signs on real property in residential districts advertising duly licensed rummage and garage sales when in compliance with the following: (a) Temporary signs shall not exceed four square feet and shall be limited to on-site signs. (b) Such ...
Digital Billboards
Antioch treats digital and changeable-message displays as 'flashing' or 'moving' signs under AMC § 9-5.505, and § 9-5.508(H) confines them to the Downtown District. Anywhere else a scintillating, flashing, or digitally animated sign cannot be permitted at all, and even downtown it needs Design Review Board sign-off on design, color, and flash rate.
Antioch Flashing and Digital Sign Rules
Significant RestrictionsAntioch Municipal Code § 9-5.508(H) (Flashing Signs)
(H) Flashing signs. Flashing, scintillating, and similar signs may be erected only in the Downtown District and then only with the approval of the Design Review Board as to design, color, degree of flashing, and the like. (1) Applications for flashing signs shall be submitted to the Department of Development Services, accompanied by colored drawings to scale adequate to reflect the op...
Window Signs
Antioch lets stores post up to four square feet of window signage for hours and identification without it counting toward the district's overall sign-area cap. Go over four square feet and the whole window sign counts against that cap, and any sign still needs a Title 8, Chapter 6 permit under the Sign Code.
Antioch Window Sign 4 Sq Ft Exemption
Some RestrictionsAntioch Municipal Code § 9-5.505(B)(10)
WINDOW SIGN. Any sign which is posted or painted on or otherwise affixed to a display window or any sign placed within four feet of a window and which is visible through a display window. Window signs of up to four square feet shall be allowed for store hours and identification purposes without deducting from the square footage allowed for the use by the provisions of this article. Any window s...
Freeway-Facing Signs
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.
Antioch Freeway-Facing Sign Rules
Some RestrictionsAntioch Municipal Code § 9-5.508(C) (Freeway-Oriented Signs)
(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 ...
Looking for Contra Costa County county-wide rules?
County ordinances apply to unincorporated areas and may supplement Antioch city rules.
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