Costa Mesa Neighbor Fence Rules Rules (2026): What You Need to Know

Boundary fence matters between neighbors in Costa Mesa are governed by California Civil Code Section 841, known as the Good Neighbor Fence Act of 2013. This statewide statute applies in all California cities and supersedes any conflicting local ordinances. Under Section 841, adjoining landowners are presumed to benefit equally from a boundary fence and are therefore presumed to share equally in the reasonable costs of constructing, maintaining, or replacing that fence. This presumption of equal benefit and equal cost-sharing is the legal starting point for all boundary fence situations in Costa Mesa, whether the properties are single-family homes, multi-family residences, or mixed-use properties.

Before beginning new fence construction, a major repair, or replacement of a boundary fence, the initiating property owner must provide written notice to the adjoining property owner at least 30 days before work begins. The notice must include: a description of the problem or reason for the fence work, the proposed solution including materials and design, an estimated total cost supported by at least one written bid from a qualified contractor, the proposed division of costs between the two owners, and the proposed timeline for completion. The adjoining owner has 30 days to respond. If they agree, both parties proceed and share costs as negotiated. If the adjoining owner disagrees, does not respond, or refuses to participate, the initiating owner may proceed with reasonable fence work and later pursue the neighbor's share through small claims court or civil litigation.

The City of Costa Mesa plays no role in adjudicating property line disputes, cost-sharing disagreements, or personal conflicts between neighbors regarding fence style, color, or orientation. Costa Mesa Code Enforcement and the Planning Division will enforce the CMMC zoning code provisions that regulate fence height, approved materials, setback compliance, and sight-line visibility requirements on individual properties. If a fence violates zoning standards — regardless of which neighbor built it — the city may issue a code enforcement notice. Property owners with boundary questions should hire a licensed surveyor to establish their property lines. Cost-sharing disputes under Civil Code Section 841 are civil matters resolved through direct negotiation, community mediation programs (such as those offered through the Orange County Human Relations Commission), or small claims court for amounts up to $12,500.