St. Louis, MO Swimming Pools & Spas: Fencing & Safety Requirements (2026)
Key Facts
- 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
Summary
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.
A swimming pool, spa or hot tub or appurtenances thereto shall not be constructed, installed, enlarged, or altered until construction documents have been submitted and a permit has been obtained from the building official. The approval of all authorities having jurisdiction over swimming pools shall be obtained before a permit can be issued.
Official source re-checked September 7, 2026: no newer edition of the code had been published (publisher’s edition: Code of Ordinances: Supplement 11).
Full Breakdown
Under the City's amended 2018 International Building Code, a hot tub, spa, or swimming pool can't be built, installed, enlarged, or altered until construction documents are submitted and the building official issues a permit: approval from every other authority with jurisdiction over pools has to come first. The exemption for pools under 24 inches deep or 250 square feet doesn't apply if the unit has a permanent water-recirculating system, which covers most factory hot tubs. Placement is restricted too: no spa or pool wall may sit closer than six feet to a rear or side property line, or ten feet to a street line, and it can't encroach into the required front or side yard.
Violations & Fines
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.
Frequently Asked Questions
Do I need a permit to install a hot tub in St. Louis?
Are small, non-plumbed hot tubs exempt from the permit rule?
How close to my property line can I put a hot tub?
Sources & Official References
Other rules in St. Louis
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