Whatcom County does not require a building permit for an ordinary residential fence within the zoned height. Permits kick in for taller fences, masonry or engineered walls, and any fence clearing ground inside a regulated critical area, shoreline, or the Lake Whatcom watershed.
Most wood, vinyl, and chain-link fences in unincorporated Whatcom County need no building permit as long as they stay within the zoned height and the corner vision triangle. A building permit is required for taller structures, masonry or concrete walls, and pool barriers. The bigger trap here is location: clearing, grading, or fencing inside a critical area buffer, a shoreline, or the Lake Whatcom watershed can require a critical-areas review or shoreline permit under the county's Growth Management Act regulations. Call 811 to locate underground utilities before setting posts, and confirm easements on your plat.
An unpermitted fence in a critical area or shoreline zone can draw a stop-work order, after-the-fact permit fees, and an order to restore cleared vegetation.
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Whatcom County, WA
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See how Whatcom County's permit requirements rules stack up against other locations.
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