Jefferson County, MO Swimming Pools & Spas: Pool Permits (2026)
Swimming pool permit rules in Jefferson County, MO, also covering above-ground pools, in-ground pools, and spa installations, set fencing, barrier, alarm, and inspection requirements.
Key Facts
- Permit trigger
- Any pool over 24 inches deep or non-prefabricated
- Governing section
- Code of Ordinances § 500.400, IRC R105.2
- Fee for pool under $1,000 cost
- $125.00 (§500.250 item 13)
- Work-before-permit penalty
- 100% surcharge on permit fee
- Max misdemeanor fine
- $1,000.00 or 1 year jail
- Rear yard setback
- 15 feet from outside pool wall
Summary
A building permit is required before installing a residential swimming pool in unincorporated Jefferson County unless the pool is prefabricated and less than 24 inches deep. The Code Official in the Code Enforcement Division reviews applications under Building Code Section 500.400, and fees are set on a cost-of-construction sliding scale under Section 500.250.
R105.2. Delete and insert in lieu thereof the following: Work Exempt from Permit. Exemption from permit requirements of this code shall not be deemed to grant authorization for any work to be done in any manner in violation of the provisions of this code or any other laws or ordinances of Jefferson County, Missouri. Permits shall not be required for the following: Building: ... 7. Prefabricated swimming pools that are less than twenty four (24) inches (610 mm) deep.
Full Breakdown
400. 2, "Work Exempt from Permit," lists the narrow categories of construction that do not need a permit, including item 7: prefabricated swimming pools under 24 inches deep. Any pool that exceeds that depth, or any pool that is not prefabricated, falls outside the exemption and requires a permit from the Code Official before construction begins. 300, so pool permits are processed exactly like other building permits rather than under a separate pool-specific procedure. 00, up to higher tiers for larger installations. 065 caps the time to complete permitted work at one year from issuance, with a discretionary one-year extension for reasonable cause; work that is not completed empowers the Code Official to disconnect utility service.
2770(D)(5)) require a permitted pool to meet a 15-foot rear yard setback and the applicable side yard setback, measured from the outside pool wall, and pools on corner lots must sit behind the primary structure and at least 15 feet from side property lines.
Violations & Fines
Starting pool construction before a permit issues triggers a 100 percent penalty on top of the normal permit fee under Section 500.300(C), plus authority for the Code Official to disconnect utilities. Section 500.300(E) makes any Building Code violation a misdemeanor punishable by a fine of up to $1,000.00, up to one year in jail, or both, with each day of a continuing violation charged as a separate offense prosecuted in Jefferson County Municipal Court.
Frequently Asked Questions
Do I need a permit for an above-ground pool in Jefferson County?
How much does a Jefferson County pool permit cost?
What happens if I build a pool before getting a permit?
How close to my property line can a permitted pool sit?
Sources & Official References
Other rules in Jefferson County
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