Clarksville, TN Fence Regulations: Retaining Walls (2026)
Key Facts
- Dedicated ordinance
- None in city code
- Sight triangle
- Retaining walls exempted
- Grading permit
- Excavation for walls exempt
- Structural rules
- 2018 IBC and IRC
- Permit authority
- Building and Codes Department
Summary
Clarksville has no chapter devoted to retaining walls. The zoning ordinance exempts them from the corner sight-triangle height limit, the drainage chapter exempts their excavation from grading permits, and structural review runs through the adopted building code.
Grading permits shall be required for all land disturbing activities with the following exemptions: ... Finish grading or excavation below finished grade for retaining walls, swimming pools, human or animal cemeteries.
Official source re-checked September 7, 2026: no newer edition of the code had been published (publisher’s edition: Code of Ordinances: Supplement 110 Update 2 | Zoning Ordinance: Supplement 6).
Full Breakdown
A full-text sweep of the Clarksville code and zoning ordinance turns up retaining walls in only two operative places. Zoning Ordinance Sec. 4.1.1 caps vision-impeding fences, walls, structures and vegetation in the corner sight triangle at three and one-half feet, then carves out retaining walls from that limit. City Code Sec. 12-304 exempts finish grading or excavation below finished grade for retaining walls, swimming pools and cemeteries from the grading permit that otherwise attaches to land disturbing activity. Structural requirements come from the 2018 International Building Code and 2018 International Residential Code adopted at Sec. 4-201 and Sec. 4-801. The city publishes no separate wall height threshold in ordinance form.
Violations & Fines
Building without a required permit is enforced by Building and Codes under the adopted codes, which set a fifty dollar civil fine with each day a separate offense.
Frequently Asked Questions
Do I need a permit for a retaining wall?
Can my retaining wall sit in the corner sight triangle?
Will I need a grading permit to dig for it?
Sources & Official References
Other rules in Clarksville
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