Neither Lehigh County nor Allentown zoning requires a neighbor's consent to build a fence on your own property. Boundary and cost-sharing disputes are civil matters under Pennsylvania common law, not a county ordinance.
Pennsylvania has no statewide 'good-neighbor' fence-cost-sharing statute for ordinary residential lots (the old Partition Fence Act mainly addresses farm/livestock line fences). Allentown's Zoning Ordinance regulates fence height, location, and materials but does not require neighbor approval. Critically, height is measured on the side facing the neighbor: §660-45.A(4) measures a fence 'on the exterior side of the fence or wall that faces a street, alley or other property.' Practically, keep the fence on your side of the surveyed property line, since building over the line can trigger a private trespass or encroachment claim. Get a survey if the boundary is uncertain; the county and city do not adjudicate line disputes.
No zoning penalty for building on your own land, but an encroaching or over-height fence can prompt a municipal zoning notice; boundary disputes are resolved through civil court, not the county.
Other ordinances people look up for this city. Green dot = verified primary-source excerpt.
Lehigh County, PA
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Lehigh County, PA
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Lehigh County, PA
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Lehigh County, PA
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Lehigh County, PA
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Lehigh County, PA
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