Sign Regulations in Alameda County, CA (2026)

2 county-level rules, plus city-specific rules for 6 cities in Alameda County, California.

Verified from official government sources

Note: These county rules apply to unincorporated areas of Alameda County. If you live within an incorporated city, that city's own rules apply: see the city list below.

Political Signs

Alameda County allows political signs on private property with First Amendment protections. Signs in public right-of-way are prohibited. No permit required for residential political signs.

Political Signs in Alameda County

Light Restrictions

California Civil Code § 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...

Full ordinance details →Official source ↗

Window Signs

In unincorporated Alameda County, signs viewed through a window count toward the property's total sign area only if they cover more than 25% of that window's area.

Window Sign Rules in Alameda County

Some Restrictions

Alameda County Code § 17.52.520(P)

Signs located inside a building or structure, provided any such sign is neither attached to windows with its sign copy visible from the outside nor otherwise so located inside so as to be conspicuously visible and readable without intentional and deliberate effort from outside the building or structure, provided, however, that any sign or signs which in the aggregate have an area not exceeding ...

Full ordinance details →Official source ↗