Pennsylvania has no state fence cost-sharing law (unlike California). Each property owner responsible for their own fence in Allegheny County. Common-law spite-fence doctrine applies. Finished side must face neighbor in most municipalities.
Absent a written agreement, PA neighbors share no legal obligation to split fence costs. A fence on the property line is owned by the builder unless both parties sign an agreement. Pittsburgh Code and most Allegheny municipalities require the finished (smooth) side of the fence face the neighbor. The common-law spite fence doctrine (malicious fences built only to annoy) remains actionable. Boundary disputes typically require a licensed surveyor.
Civil dispute; municipal code covers finished-side rule ($100-$300 fine). Spite fence: injunction + damages.
See how Allegheny County's neighbor fence rules rules stack up against other locations.
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