HVAC Contractor Permit Requirements in Billings, MT

Complete permit and license guide for starting a hvac contractor in Billings, Yellowstone County, Montana.

Updated 2026-03-15 6 stops $400–$1,500 est. 4–10 weeks
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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

1 stop

  1. 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 Montana

2 stops

  1. Montana — No Sales Tax

    Montana has no state or local sales tax. Businesses do not need a sales tax permit. However, businesses must register with the Montana Department of Revenue for applicable business taxes (e.g., withholding, corporate income tax if applicable).

    Official government source

    Free (business registration)Immediate (online via TransAction Portal)

  2. EPA Section 608 Certification (for refrigerants)

    Technicians who purchase, recover, or handle refrigerants must hold EPA Section 608 certification. Required by federal law regardless of state.

    Official government source

    $20–$100 (exam)1–2 days

City of Billings / Yellowstone County

3 stops

  1. Montana Department of Labor and Industry — HVAC Mechanical Contractor License

    HVAC contractors in Montana must hold a Mechanical Contractor License. EPA Section 608 certification is required for refrigerant handling. Permits are required for each project.

    Official government source

    $100–$200 (initial)4–8 weeks

  2. City of Billings City Clerk — Business License

    Billings requires a Business License for regulated businesses operating within city limits. The City Clerk's office processes applications. This license must be renewed annually and displayed at your place of business.

    Official government source

    $50–$500/year depending on business type and gross revenues1–3 weeks

  3. Yellowstone County / Billings Mechanical Permit (per project)

    A mechanical permit must be obtained from the local building department for each HVAC installation or major repair. Inspections are required upon completion.

    Official government source

    $50–$300 per project1–5 business days

Terminus

Open for business — est. $400–$1,500 · 4–10 weeks

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Official Sources

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