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Alameda County, CA Sign Regulations: Political Signs (2026)

Light Restrictions
Compiled from the official code textEditor Martyn O'NeillLast verified April 2026

Key Facts

Permit
Not required on private property
Size Limit
Typically 6 square feet in residential
ROW Ban
Prohibited in public right-of-way
HOA
Civil Code 4710 protections

Summary

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.

City-specific rules exist: Livermore, Hayward, Berkeley, San Leandro, and Fremont have their own political signs rules that differ from Alameda County's county-level regulations. If you live in one of those cities, check the city-specific page instead.

(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, cardboard, cloth, plastic, or fabric, and may be posted or displayed from the yard, window, door, balcony, or outside wall of the separate interest. (c) An association may prohibit noncommercial signs and posters that are more than nine square feet in size and noncommercial flags or banners that are more than 15 square feet in size.

Source: CA Civil Code 4710View official code

Full Breakdown

Alameda County permits political signs on private residential property in unincorporated areas under First Amendment protections established by Reed v. Town of Gilbert (2015), which prohibits content-based sign regulation. No permit is required for temporary political signs on private property. Size and setback limits in the county zoning code apply based on zoning district, typically allowing signs under 6 square feet in residential zones. Political signs are prohibited in the public right-of-way (sidewalks, medians, utility poles) and can be removed by Public Works without notice. Signs must be removed within a reasonable time after the election, typically 10 days. HOA restrictions are limited by California Civil Code 4710.

Frequently Asked Questions

Can I put a political sign in my yard in Castro Valley?
Yes, without a permit, subject to size limits in the zoning code and a requirement to remove within 10 days after the election.
Can my HOA prohibit political signs?
No. California Civil Code 4710 prevents HOAs from prohibiting noncommercial signs and flags on member-owned property with only reasonable restrictions.

Sources & Official References

Other rules in Alameda County

Window SignsSome RestrictionsParking Rules: Commercial & Oversized VehiclesSignificant RestrictionsParking Rules: Preferential Parking DistrictsSome RestrictionsParking Rules: Loading ZonesSome RestrictionsLandscaping Rules: Tree Removal & Heritage TreesSome RestrictionsWater Use Rules: Recycled Water RulesLight RestrictionsHistoric Preservation: Historic-Cultural MonumentsSignificant Restrictions

All Alameda County rules

California rules heatmap·Compare Alameda County to another location·View the California sign regulations overview

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Political Signs in Cities Across Alameda County

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