Contra Costa County's Ordinance Code does not impose a general material restriction on residential fences in unincorporated areas. The only material-specific rule is that concrete and masonry walls are classified as walls (not fences) and require a building permit regardless of height.
Unlike many incorporated cities in the county, no county-wide ordinance prohibits specific fence materials such as barbed wire, chain link, or razor wire on residential property in unincorporated areas. Per Ordinance Code Section 72-6.202, the only material-based distinction is that 'Concrete and masonry walls are considered walls, not fences and do require building permits.' Wood, vinyl, chain link, wrought iron and wire fences up to 7 feet are exempt from the permit requirement. Property owners should still check the underlying zoning district (Title 8) for any use-specific limits, and any homeowners' association CC&Rs that may impose stricter material rules.
Installing a masonry or concrete wall without a permit is enforceable as a Building Code violation; the county may require removal or after-the-fact permitting. Other material choices are governed primarily by private CC&Rs, neighbor relations, and California Civil Code 'spite fence' provisions (Civ. Code Section 841.4), not by county ordinance.
Other ordinances people look up for this city. Green dot = verified primary-source excerpt.
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