HVAC Contractor Permit Requirements in St. Louis, MO

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

$450 -- $1600 6–12 weeks to obtain all licenses 4 requirements

Not legal advice. Requirements may change — always verify with your local government authority before applying. Last verified: .

St. Louis / St. Louis City County Requirements

1 requirement
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.

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

Missouri State Requirements

1 requirement
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.

No state fee (local fees vary)Varies by jurisdiction
Official government source

Federal Requirements

2 requirements
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.

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

EIN (Employer Identification Number)

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

FreeImmediate (online application)
Official government source

Official Sources

Get your personalized permit checklist

Find out exactly which permits and licenses your hvac contractor needs in St. Louis, MO — with costs, timelines, and official links.

Get Your Permit Report — $9.99
Ready in ~60 seconds Secure payment via Stripe Official links & citations

Related Guides

Stop guessing about permits

Know exactly what permits your business needs

Get a personalized permit report with every license, registration, and permit required for your business — with costs, timelines, and official application links.

Get Your Permit Report — $9.99
Ready in ~60 seconds Secure payment via Stripe 50 states, 4,000+ jurisdictions