Fence cost sharing between neighbors in unincorporated San Mateo County is governed by California Civil Code §841 (Good Neighbor Fence Act). The county does not mediate fence disputes.
California Civil Code §841 governs boundary fence cost sharing. Adjoining property owners are presumed to share equally in the reasonable cost and maintenance of a good neighbor fence. Prior written notice of at least 30 days is required before constructing or replacing a shared fence. If a neighbor declines to share costs, the initiating owner may proceed independently and seek reimbursement through small claims court. The county does not mediate fence disputes.
Civil remedy: neighbor can sue for share of costs. Spite fence: injunction + damages. Small claims court for disputes under $12,500.
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See how San Mateo County's neighbor fence rules rules stack up against other locations.
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