Longmont, CO Swimming Pools & Spas: Fencing Requirements (2026)

Per the Building Services Fence Building Guide (LMC 15.05.100), all swimming pools deeper than 24 inches and all hot tubs and spas must be enclosed by fencing 'of a type that is not readily accessible by children and that contains no opening larger than four inches.' The minimum height is 4 feet, and if equipped with a gate the gate must have a latch meeting the city's adopted codes. Because Longmont adopted the 2021 I-Codes effective January 1, 2022, 2021 IRC Appendix V (Section AV105) provides the detailed barrier standard: 48-inch minimum height measured on the side facing away from the pool; horizontal members spaced at least 45 inches apart (or, if less, with mesh openings no larger than 1-3/4 inches); maximum 2-inch clearance between bottom of barrier and grade (4 inches if on top of a solid surface); gates self-closing and self-latching, opening outward away from the pool, with the latch release at least 54 inches above the bottom of the gate. Where a wall of the dwelling forms part of the barrier, doors opening directly to the pool area must be equipped with an alarm or other approved means of protection.