Rapid City, SD Fence Regulations: Retaining Walls (2026)
Key Facts
- Permit-exempt wall height
- 4 feet or less, footing to top
- Surcharge walls
- Always need a permit
- Governing exemption section
- § 15.04.160.A.1.c
- Guardrail requirement
- Required unless fence present
- General penalty
- $1-$500 or 30 days jail
Summary
Rapid City exempts short retaining walls from the building permit requirement but regulates taller ones and any guardrail on top. Under Rapid City Municipal Code § 15.04.160, a retaining wall needs no building permit if it is 4 feet or less from the bottom of the footing to the top and does not support a surcharge; anything taller, or any surcharge-bearing wall, needs a permit. Section 17.50.340 requires a guardrail atop a retaining wall under the building code, unless a fence is already present.
c. Retaining walls that are not over 4 feet (1219 mm) in height measured from the bottom of the footing to the top of the wall, unless supporting a surcharge; ... RETAINING WALL. ... A wall designed to resist the lateral displacement of soil or other materials. ... 3. Guardrails required on retaining walls. Unless a fence is already present, guardrails shall be constructed on top of retaining walls in accordance with, and if required by, the current building codes adopted by the City of Rapid City. Such guardrails shall be limited in height to the applicable maximum height for a fence or wall.
Full Breakdown
150 and engineered plans. 340, defines a RETAINING WALL as a wall designed to resist the lateral displacement of soil or other materials, and treats it separately from a fence, though a fence or wall may be built on top of a retaining wall as long as combined height rules in the section are met. 3 (industrial) each require the guardrail to be built unless a fence is already present, and the guardrail's height is capped at whatever the maximum fence or wall height is for that zoning district. A.
Violations & Fines
Constructing a retaining wall over 4 feet, or one that supports a surcharge, without first obtaining a building permit is unlawful under § 15.04.300 and § 15.04.150, and carries the general penalty of § 1.12.010: a fine of $1 to $500, up to 30 days in jail, or both, with each day of the violation a separate offense. Skipping a required guardrail on top of a retaining wall under § 17.50.340 can likewise be cited as a code violation subject to the same general penalty.
Frequently Asked Questions
Do I need a permit for a retaining wall in Rapid City?
Does Rapid City require a guardrail on top of a retaining wall?
Can I build a fence on top of my retaining wall?
Sources & Official References
Other rules in Rapid City
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