Residential fences up to 6 feet tall in unincorporated Alameda County generally do not require building permits. Fences over 6 feet, retaining wall/fence combinations, and fences in front yards exceeding zoning height limits require permits.
Under the California Building Code as adopted by Alameda County, fences up to 6 feet in height are generally exempt from building permits in unincorporated areas. Front yard fence heights are regulated by zoning, typically limited to 3-4 feet depending on the district. Fences exceeding 6 feet require a building permit and may need engineering. Retaining walls that also serve as fences have combined height calculations — a retaining wall with a fence on top may require a permit if the total height exceeds 6 feet. Properties in certain zoning districts or overlay zones may have additional fence restrictions. Pool enclosure fences have specific height and design requirements under building code safety provisions (minimum 5 feet with self-closing, self-latching gates). Barbed wire and razor wire are typically prohibited in residential zones. The county's zoning code may also regulate fence materials in certain areas, particularly near scenic corridors or in planned development districts.
Fences built over height limits without permits are building code violations and may need to be modified or removed. Inadequate pool fencing is a safety violation subject to immediate correction orders. Front yard fences exceeding zoning limits face zoning enforcement.
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See how Castro Valley's fence permits rules stack up against other locations.
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