State Guide · Verified 2026
Pool Construction Permits in Montana
Any pool more than 24 inches deep requires a permit and a compliant safety barrier at least 48 inches high with self-closing, self-latching gates (IRC R326 / ISPSC). Prefabricated pools under 24 inches deep are exempt.
The Building Code in Montana
ARM 24.301.175, transitioning from 2021 to 2024 ISPSC
Montana is actively transitioning from the 2021 to the 2024 ISPSC under ARM 24.301.175, with a public comment period that closed September 4, 2026. MCA 76-2-412 specifically exempts small residential facilities serving 8 or fewer people, and daycare homes serving 12 or fewer children, from the ISPSC. Montana's pool code, like most states, is chiefly public-facility focused; residential pools fall under the same mixed state/local enforcement model confirmed for other Montana project types.
Quick Facts
Who Sets the Rules
A code update genuinely in progress
Montana's pool code is being updated from the 2021 to the 2024 ISPSC right now, with the public comment period closing September 4, 2026, worth confirming current adoption status given how recent this transition is.
A real, specific small-facility carve-out
MCA 76-2-412 exempts residential facilities of 8 or fewer people and daycare homes of 12 or fewer children from the ISPSC entirely, a specific, real exemption for smaller-scale operations.
What people get wrong
The most common mistake is assuming the 2021 ISPSC is still current. Montana is actively moving to the 2024 edition as of this writing.
Counties With Their Own Rules
These Montana counties have verified, county-specific pool construction rules that differ from the state baseline:
Cities With Their Own Rules
These Montana cities have verified, city-specific pool construction rules that differ from the county or state baseline:
Browse All Counties & Cities
Search and browse the full directory of 56 counties and every city in Montana for local rules, fees, and building department contact details.
Browse the full Montana directory →Building It Yourself? Here's What You'll Need
Meeting the pool safety code? Barrier and safety gear homeowners rely on:
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Official Sources
Rules change and cities within a county may differ. This guide is general information, not legal advice, always confirm with your local building department. Reviewed by the StateDataIndex Editorial Team · Updated September 2026.