7 county-level rules, plus city-specific rules for 1 city in Clark County, Washington.
Verified from official government sources
In unincorporated Clark County, a fence or wall (or a combined berm and fence/wall) may not exceed six feet above finished grade at its base, unless the review authority approves added height. Fences must not obstruct intersection sight distance.
CCC 40.320.010(C)(2)(a)
A fence or wall (or a combination of a berm and fence or wall) may not exceed a height of six (6) feet above the finished grade at the base of the fence or wall (or at the base of a berm, if combined with one) unless the review authority finds additional height is necessary to mitigate potential adverse effects.
Unincorporated Clark County does not require a building permit for fences seven feet or less in height. Fences over seven feet, and retaining walls over four feet (or any wall carrying a surcharge), do require a permit.
Clark County Residential Permits (fence/retaining-wall thresholds)
Fences seven feet or less in height do not require a permit. ... A permit is needed for retaining walls over 4' in height or retaining walls at any height that carries a surcharge.
Clark County does not set a cost-sharing rule for boundary fences; that is a private matter under Washington law. County code does let neighbors agree in writing to exceed height limits within setbacks, and lets walls or fences between commonly owned lots exceed those limits.
CCC 40.320.010(F)(4)(f)
Permission to exceed the height limits within the setback is granted in writing from the abutting property owner.
Clark County allows retaining walls four feet or less (and fences seven feet or less) within easements. Walls over four feet, or fences over seven feet, must meet the underlying zone's setbacks, with specific exceptions. Walls over four feet need a permit and engineering.
CCC 40.320.010(F)(4)
The construction of retaining walls in excess of four (4) feet in height and fences in excess of seven (7) feet in height shall meet the setback requirements of the underlying zone, except as authorized below. The height of a fence on top of retaining walls shall be measured to the grade at the bottom of the wall.
Clark County defines partial (F1) and full (F2) sight-obscuring fence standards, each six feet high. Fences may not obstruct sight distance at intersections, and private fences are prohibited within public rights-of-way without Public Works Director approval.
CCC 40.320.010(B)(7)
A fence or wall that complies with the F2 standard shall be six (6) feet high and one hundred percent (100%) sight-obscuring. Fences may be made of wood, metal, bricks, masonry or other permanent materials. This shall not include chain link fences with slats or similar construction.
Clark County's fully sight-obscuring (F2) fence standard permits wood, metal, brick, masonry, or other permanent materials but excludes chain-link fences with slats. The partial (F1) standard allows chain link with slats. No general residential ban on barbed wire is set in this screening chapter.
CCC 40.320.010(B)(6)(b)
A fence or wall that complies with the F1 standard shall be six (6) feet high and at least fifty percent (50%) sight-obscuring. Fences may be made of wood, metal, chain link with slats, bricks, masonry or other permanent materials.
Clark County requires screening fences to use permanent materials. Allowed materials include wood, metal, brick, and masonry; chain link with slats is allowed only for the partial (F1) standard, and non-sight-obscuring chain link or wrought iron is permitted atop low retaining walls.
CCC 40.320.010(F)(4)(h)
Non-sight-obscuring fences such as chain link or wrought iron seven (7) feet high or less and sight-obscuring fences forty-two (42) inches high on top of retaining walls no greater than four (4) feet tall are allowed within setbacks per Figure 40.320.010-8.
1 cities in Clark County have their own fence regulations rules. Each link goes to that city's dedicated page with code citations.
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