HVAC Contractor Permit Requirements in St. Louis, MO

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)

   $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

   Free·Immediate (online application)

   Free

   Immediate (online application)

1. Missouri Division of Professional Registration — HVAC Contractor License

   Missouri does not have a statewide HVAC license requirement, but many cities and counties (including Kansas City and St. Louis) have local licensing requirements. All contractors must comply with EPA Section 608 for refrigerant handling.

   Official government source

   No state fee (local fees vary)·Varies by jurisdiction

   No state fee (local fees vary)

   Varies by jurisdiction

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

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

   2–4 weeks

Official Sources

• St. Louis Building Division
• Missouri Division of Professional Registration

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