St. Louis, MO Fence Regulations: Pool Barriers (2026)

Under St. Louis Revised Code 25.60 and the adopted 2018 International Residential Code Appendix G, all residential swimming pools, hot tubs, and spas capable of holding water more than 24 inches deep must be enclosed by a barrier at least 48 inches high measured from the exterior side. Acceptable barriers include chain link with maximum 1.75-inch mesh, vertical pickets with maximum 4-inch spacing, solid walls, or the dwelling itself where power-operated pool covers or door alarms meeting ASTM F2208 are installed. Gates must be self-closing and self-latching with the latch located on the pool side at least 54 inches above grade. Above-ground pools with walls 48 inches or higher qualify as their own barrier when the ladder is removable or lockable. Above-ground spas with locking hard covers meeting ASTM F1346 are exempt from perimeter fencing. Pool permits are required before water fill; the Building Division inspects barriers before final approval. Missouri DHSS 19 CSR 20-3 governs public and semi-public pools, not residential.