Charleston County, SC Fence Regulations: Retaining Walls (2026)
Key Facts
- Permit-exempt wall height
- 4 feet (1,219 mm), footing to top
- Governing section
- Sec. 4-20, § 105.2, item 4
- Loses exemption if
- supports surcharge or Class I/II/IIIA liquids
- Enforcing office
- Charleston County Building Inspection Services
- Appeal deadline
- 20 calendar days to Construction Board
Summary
A retaining wall over 4 feet tall, measured from the bottom of the footing to the top, needs a Charleston County building permit before construction starts. Walls of 4 feet or under are exempt under Sec. 4-20, § 105.2, unless the wall supports a surcharge or holds back Class I, II, or IIIA liquids.
105.1 Required Permits. Any owner or authorized agent who intends to construct, enlarge, alter, repair, move, demolish, or change the occupancy of a building or structure, or to erect, install, enlarge, alter, repair, remove, convert or replace any electrical, gas, mechanical or plumbing system, the installation of which is regulated by "this code", or to cause any such work to be done, shall first make application; to the Building Official and obtain the required permit. ... 105.2 Work exempt from permit. Exemptions from permit requirements of "this code" shall not be deemed to grant authorization for any work to be done in any manner in violation of the provisions of this code or any other laws or ordinances of this jurisdiction. Permits shall not be required for the following: Building: ... 4.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 or impounding Class I, II, or IIIA liquids.
Official source re-checked September 7, 2026: no newer edition of the code had been published (publisher’s edition: Code of Ordinances: Supplement 21).
Full Breakdown
1 of Charleston County's Chapter 4 building code (Ordinance No. 2283, adopted March 26, 2024) requires an owner who intends to construct any structure regulated by the code to file an application with the Building Official and obtain a permit before work begins. ' That measurement method matters: the 4-foot threshold runs from the footing, not from finished grade, so a wall with a buried footing can require a permit even if less of it is visible above ground. The surcharge and liquid-impoundment carve-outs mean a short wall holding back a driveway, parking area, or flammable-liquid tank loses the exemption regardless of height.
2 exemption, the exemption 'shall not be deemed to grant authorization for any work to be done in any manner in violation of the provisions of this code or any other laws or ordinances of this jurisdiction,' so an exempt wall still has to meet any applicable zoning or drainage standard. 5). 4.
Violations & Fines
Constructing a retaining wall requiring a permit without first obtaining one is a misdemeanor under Sec. 4-30, § 115.1.1. Because no specific fine applies to this offense, § 115.4.1 imposes the maximum penalty a South Carolina magistrate's court may set, and each day the unpermitted wall remains counts as a separate violation under § 115.1.3. The county may also pursue injunctive relief or mandamus to compel correction.
Frequently Asked Questions
Do I need a permit for a retaining wall in unincorporated Charleston County?
How is retaining wall height measured for the permit exemption?
Does a short retaining wall still have to meet any county standards?
What's the penalty for building an unpermitted retaining wall over 4 feet?
Sources & Official References
Other rules in Charleston County
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