HVAC Contractor Permit Requirements in St. Louis, MO

Complete permit and license guide for starting a hvac contractor in St. Louis, St. Louis City, Missouri.

Updated 2026-03-15 4 stops $450–$1,600 est. 6–12 weeks to obtain all licenses
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Not legal advice. Requirements may change — always verify with your local government authority before applying. This guide was compiled from public and official sources (last updated ) and has not yet been independently source-verified — confirm each requirement before acting on it.

Federal — start here

2 stops

  1. EPA Section 608 Technician Certification

    Federal law requires all HVAC technicians who purchase or handle refrigerants to be certified under EPA Section 608 of the Clean Air Act. Certification is available in Type I (small appliances), Type II (high-pressure), Type III (low-pressure), and Universal categories. Certification is obtained through an EPA-approved testing organization such as ESCO Institute or NATE.

    Official government source

    $20–$60 (exam fee)1–2 weeks (exam scheduling)

  2. EIN (Employer Identification Number)

    Required if you have employees or operate as an LLC or corporation. Free from the IRS.

    Official government source

    FreeImmediate (online application)

State of Missouri

1 stop

  1. Missouri HVAC Contractor Licensing — Local (No Statewide License)

    Missouri has no statewide HVAC/mechanical contractor license — the Division of Professional Registration issues none, and the proposed Statewide Mechanical Contractor Licensing Act has not been enacted (still a pending bill as of 2026). Licensing is municipal/county: Kansas City, St. Louis City/County, Springfield, Liberty, and most KC-metro cities run their own mechanical contractor licenses — apply in each jurisdiction where you work. EPA Section 608 certification for refrigerant handling is a separate federal requirement.

    Official government source

    No state fee (local fees vary)Varies by jurisdiction

City of St. Louis / St. Louis City

1 stop

  1. City of St. Louis — Mechanical Contractor License

    St. Louis requires HVAC contractors to hold a city-issued mechanical contractor license and obtain mechanical permits for each project from the St. Louis Building Division.

    Official government source

    $100/year (license) + $50–$400 per project (permit)2–4 weeks

Terminus

Open for business — est. $450–$1,600 · 6–12 weeks to obtain all licenses

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Official Sources

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