Overland Park treats retaining walls as accessory structures under 18.390.140(C)(3). A wall must be justified by lot topography, sit at least 2 feet off any street right-of-way, and rise no more than 6 inches above the ground it retains.
The UDO permits retaining walls where they are reasonably necessary due to the topography of the lot. Two dimensional limits apply: a 2-foot minimum separation from any street right-of-way, and a maximum of 6 inches of wall projecting above the retained ground level. Anything projecting higher functions as a fence or wall and falls under the 8-foot cap and fence permit in 18.390.140(C)(1). On the permitting side, Section 18.130.015 lists retaining walls among the site improvements needing a site development permit, and lets the Director of Planning and Development Services waive that permit for minor work including retaining walls under four feet in height.
Municipal Court prosecution and stop-work orders. Walls placed in street right-of-way or obstructing the sight distance triangle must be removed or rebuilt.
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Overland Park, KS
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