Orange County, CA Fence Regulations: Neighbor Fence Rules (2026)

Orange County's Zoning Code sets height and location rules, but cost-sharing and responsibility for a fence on a shared property line are controlled by state law, specifically California Civil Code Section 841 (the Good Neighbor Fence Law). Section 841(a) provides that adjoining landowners shall share equally in the responsibility for maintaining the boundaries and monuments between them. Section 841(b)(1) states that adjoining landowners are presumed to share an equal benefit from any fence dividing their properties and, unless otherwise agreed to in a written agreement, are presumed equally responsible for the reasonable costs of construction, maintenance, or necessary replacement of the fence.

A landowner who intends to incur such costs must give thirty (30) days' prior written notice to each affected adjoining landowner; the notice must include notification of the presumption of equal responsibility and details such as the problem, the proposed solution, the estimated cost, the cost-sharing proposal, and the proposed timeline. The equal-responsibility presumption can be overcome by a preponderance of the evidence showing that equal cost-sharing would be unjust. Disputes over a boundary fence are generally civil matters between neighbors rather than County code-enforcement matters; the County does not adjudicate cost-sharing disputes.