San Mateo, CA Fence Regulations: Neighbor Fence Rules (2026)
Key Facts
- Cost Sharing
- Equal (CA Civil Code §841)
- Prior Notice
- 30 days written notice
- Sight Triangle
- 3–7 ft height range must be clear at intersections
- Code
- CA Civil Code §841; SMMC §27.84.050
Summary
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.
841. (a) Adjoining landowners shall share equally in the responsibility for maintaining the boundaries and monuments between them. (b) (1) Adjoining landowners are presumed to share an equal benefit from any fence dividing their properties and, unless otherwise agreed to by the parties in a written agreement, shall be presumed to be equally responsible for the reasonable costs of construction, maintenance, or necessary replacement of the fence. (2) Where a landowner intends to incur costs for a fence described in paragraph (1), the landowner shall give 30 days' prior written notice to each affected adjoining landowner.
Full Breakdown
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).
Frequently Asked Questions
Who pays for a fence between neighbors in San Mateo?
What are the rules about shared fences in San Mateo?
Sources & Official References
Other rules in San Mateo
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Neighbor Fence Rules in Nearby Cities
How other cities in San Mateo County handle neighbor fence rules.