Shared fence cost and responsibility between neighbors in San Mateo is governed by California Civil Code §841 (Good Neighbor Fence Act). Disputes are civil matters. SMMC Ch. 27.84 governs fence height and location.
California Civil Code §841 requires adjoining property owners to share equally in the reasonable cost and maintenance of a boundary fence. Prior written notice of 30 days must be provided before constructing or replacing a shared fence. If a neighbor disputes the obligation, the other owner may proceed independently but retains a right to seek reimbursement. The City of San Mateo does not mediate fence disputes. SMMC §27.84.050 requires visual clearance in the sight triangle at intersections (3 ft to 7 ft height range must be clear).
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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