Cal-Nev-Ari Fence Regulations: Retaining Walls Rules (2026)

Clark County Department of Building and Fire Prevention enforces the 2018 International Residential Code Appendix with local amendments. Retaining walls over 4 feet in height measured from the bottom of the footing to the top of the wall require a building permit, sealed engineering drawings by a Nevada-licensed professional engineer, and inspections. Walls retaining a surcharge such as a driveway, pool deck, parking, or sloped soil above the wall require a permit regardless of height. Tiered wall systems are measured as combined height when the horizontal separation is less than twice the height of the lower wall, closing a common workaround used on hillside lots near Lake Las Vegas, Anthem, and Seven Hills. Drainage, weep holes, and backfill must meet IRC standards to prevent hydrostatic failure in monsoon rain events. Segmental retaining walls (SRWs) and CMU walls both require engineered plans over 4 feet. Contractors must be licensed by the Nevada State Contractors Board (NSCB); unlicensed work over 1,000 dollars is a misdemeanor under NRS 624.700. HOAs in hillside communities typically impose additional architectural review and color standards.