Sioux Falls, SD Fence Regulations: Retaining Walls (2026)
Key Facts
- Permit-exempt height
- 4 feet or less
- Permit trigger
- Over 4 ft, or any surcharge load
- Governing code
- 2021 IRC as amended, § 150.002
- Measured from
- Bottom grade to top of wall
- Commercial counterpart
- § 150.017, IBC § 105.2, same 4 ft
Summary
Sioux Falls exempts retaining walls from a building permit only when they stay at or under 4 feet, measured from the bottom grade to the top of the wall: taller walls, or shorter ones holding back a surcharge, need a permit.
R105.2 Work exempt from permit... Permits shall not be required for the following: Building: ... 3. Retaining walls that are not over 4 feet (1,219 mm) in height measured from the bottom of the grade elevation to the top of the wall, unless supporting a surcharge.
Official source re-checked September 7, 2026: no newer edition of the code had been published (publisher’s edition: 2026 S-135: Current through local ordinance 54-26, passed 7-14-2026).
Full Breakdown
Under the city's adopted 2021 International Residential Code amendments (§ 150.002, IRC § R105.2), retaining walls that are not over 4 feet in height, measured from the bottom of the grade elevation to the top of the wall, are exempt from a building permit, unless the wall supports a surcharge. Any wall taller than 4 feet, or a shorter wall backing a driveway, parking area, or sloped fill load, must get a building permit reviewed before construction. The nearly identical commercial building code amendment (§ 150.017, IBC § 105.2) applies the same 4-foot threshold to non-residential retaining walls, with an added exception for walls impounding hazardous Class I, II, or IIIA liquids.
Violations & Fines
Building a permit-required retaining wall without one can draw a stop-work order, after-the-fact permit and inspection fees, and a requirement to expose footings or get an engineer's certification before the city will sign off.
Frequently Asked Questions
Does a 3-foot retaining wall need a permit in Sioux Falls?
What counts as a 'surcharge' that forces a permit?
Sources & Official References
Other rules in Sioux Falls
Compare Sioux Falls to another location·View the South Dakota fence regulations overview
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