Olathe, KS Fence Regulations: Retaining Walls (2026)
Key Facts
- Setback from street ROW
- At least 2 feet
- Height above retained grade
- Max 6 inches
- Walls over 3 feet
- Must have fencing on top
- Approval needed from
- City Engineer & Chief Building Inspector
Summary
Olathe requires City Engineer and Chief Building Inspector approval for commercial and industrial retaining walls, caps most at six inches above grade, and mandates fencing atop walls over three feet.
Retaining walls are permitted where the wall is reasonably necessary due to topography, where the wall is located at least two (2) feet from any street right-of-way, and where the wall does not extend more than six (6) inches above the ground level of the land being retained. Any retaining wall above three (3) feet shall have fencing. Retaining wall construction is subject to approval by the City Engineer and Chief Building Inspector.
Official source re-checked September 8, 2026: no newer edition of the code had been published (publisher’s edition: current through Ordinance 26-39, passed July 21, 2026).
Full Breakdown
Under UDO § 18.50.050.E.2, retaining walls in Olathe's commercial and industrial districts are permitted only where topography reasonably requires one, the wall sits at least two feet from any street right-of-way, and it rises no more than six inches above the grade of the retained land: any wall taller than three feet must carry fencing on top. Construction requires approval from both the City Engineer and the Chief Building Inspector. Separately, the Municipal Code's building-permit exemption list (§ 15.02.140) waives a building permit for any retaining wall four feet or shorter, citywide.
Violations & Fines
Building a noncompliant retaining wall, or skipping the required City Engineer and Chief Building Inspector approval, is a public offense under § 18.70.030.F: up to a $500 fine or six months jail per offense.
Frequently Asked Questions
Do I need City approval to build a retaining wall in Olathe?
Does a retaining wall need a fence on top?
Sources & Official References
Other rules in Olathe
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Retaining Walls in Nearby Cities
How other cities in Johnson County handle retaining walls.