How St. Louis Handles Swimming Pools & Spas: A Practical Guide
St. Louis maintains 156 local ordinances across all categories, and 2 of those deal specifically with swimming pools & spas. Here is a breakdown of what the city actually requires, what is prohibited, and where St. Louis falls on the strict-to-permissive spectrum compared to other cities.
Pool Permits
St. Louis requires a building permit and approved construction documents before any pool, spa, or hot tub is built, installed, enlarged, or altered.
Key details: Permit required: before construction, install, or enlargement. Exempt pools: under 24 in. deep, under 250 sq ft. In-ground plans: sealed by MO-licensed designer. Rear/side setback: 6 feet from property line. Street setback: 10 feet from street line.
Building without a permit or approved plans is enforced by the Building Division as a Building Code violation; the building official can order work stopped and require the pool brought into compliance or removed.
Fencing & Safety Requirements
St. Louis requires a building permit before any hot tub, spa, or pool is installed, enlarged, or altered, and the unit can't encroach into the required front or side yard.
Key details: Permit required: Before install, enlarge, or alter. Issuing authority: Building official, Division of Building & Inspection. Rear/side setback: 6 feet minimum from property line. Street setback: 10 feet minimum from street line. Small-pool exemption: Void if unit has recirculating pump.
Starting work before obtaining a permit triggers a surcharge on top of the normal building permit fee, and general code violations are separately punishable as prescribed by city ordinance.
The Bottom Line
St. Louis's swimming pools & spas rules are a mixed bag. Some areas are strict, others are relaxed, and the details matter. The best approach is to check the specific rule that applies to your situation rather than assuming St. Louis is broadly strict or permissive.
Keep in mind that St. Louis can amend these rules at any council meeting. For the most current version of any rule mentioned here, check the specific ordinance page, where we track updates as they happen.