Montana · HVAC licensing · official-source guide
Montana does not license HVAC contractors. The Montana Department of Labor and Industry issues no mechanical or refrigeration credential and gives no trade exam. Since January 1, 2026 it does require a Construction Contractor License for construction work, and proof of workers compensation compliance is the headline requirement. Electrical and plumbing portions still need separately licensed trades.
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Verify a licenseVerified against agency sources on 2026-09-14. Rules and fees change; confirm with the named authority before relying on this guide.
Montana does not license heating, ventilation, air conditioning or refrigeration as a trade. The Department of Labor and Industry publishes the full list of professional boards and programs it supervises, and that list runs from the Boiler Operator Program through Construction Contractor, Electrical, Elevator, Fire Protection, Plumbers and Sanitarians. No board of mechanical or HVAC contractors appears anywhere on it. There is no state HVAC exam, no journeyman HVAC card, no classification system that separates residential change outs from commercial rooftop work, and no state continuing education tied to mechanical trade knowledge. That surprises contractors moving in from Oregon or Utah. What Montana regulates instead is the business entity doing the construction work, the specific trades of electrical and plumbing that an HVAC job often touches, and the permit and inspection attached to the installation itself. Since January 1, 2026 the business side runs through the Construction Contractor License held by the Department of Labor and Industry. So a furnace and coil replacement in Bozeman is legal work for a licensed construction contractor with no mechanical credential of any kind, while the 240 volt circuit feeding that condenser is not. Refrigerant handling is the one technical gate, and it is federal rather than state. Treat the Montana question as three separate questions: is the company licensed to contract, is the tradesperson licensed for the electrical or plumbing portion, and did somebody pull the mechanical permit.
Montana ran a contractor registration system for decades. House Bill 239, passed in the 2025 session, replaced it. The Department of Labor and Industry states that effective January 1, 2026 all construction contractors in Montana are required to be licensed with the department, and that contractors holding an active Montana registration as of December 31, 2025 were converted to the new license automatically. The governing law moved from Title 39 to Title 37, chapter 45 of the Montana Code Annotated. The stated purpose in 37-45-101 is protecting public health, safety and welfare through regulation of construction contractors. For an HVAC company the practical change is the word on the paperwork and the enforcement teeth behind it, not a new technical test. There is still no trade exam. What did change is the penalty structure and the unprofessional conduct rule. Administrative rule 24.227.2301 makes it unprofessional conduct to fail to notify the department within 30 days of any change to ownership or business name, to fail to report changes in officers, members or partners filed with the Secretary of State, to violate any federal, state or local law relating to the occupation, and to engage a person to perform work for which that person is not licensed. That last clause matters to HVAC firms that sub out electrical or plumbing. Hiring an unlicensed electrician to land a disconnect is now your violation, not only his.
The statutory definition in 37-45-102 catches a person, firm or corporation that in the pursuit of an independent business offers to undertake, undertakes, or submits a bid to construct, alter, repair, add to, subtract from, improve, move, wreck or demolish a building or other structure attached to real estate. Installing a furnace, replacing a rooftop unit, running duct, or repiping a hydronic loop all land inside that. The department FAQ says the requirement specifically targets contractors with employees, as well as corporations and manager managed limited liability companies regardless of employee count. The exemptions live in 37-45-104. The one HVAC firms ask about most is subsection eight, which exempts a single undertaking of a casual, minor or inconsequential nature where the aggregate contract price for labor, materials and all other items is less than $2,500 a job. That exemption disappears if the work is part of a larger operation or if a job is split into smaller contracts to dodge the chapter. Other exemptions cover government representatives, public utilities doing work incidental to their own business, work inside federal enclaves, and the sale or installation of finished products that do not become a permanent fixed part of a structure. Selling a window shaker across a counter is not contracting. Cutting in a mini split line set is. Owners working on their own property are exempt unless they are building to sell promptly.
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A one truck HVAC operator in Montana with no employees has a second path. State law requires an independent contractor to either carry self elected workers compensation coverage or hold an Independent Contractor Exemption Certificate, the ICEC, under 39-71-417. The Department of Labor and Industry runs that program through its Employment Standards Division. No test is required to qualify. The application is filed online with a non refundable fee of $125, and the applicant must submit business documentation showing an established business for each occupation listed on the application. Renewal costs $125 and runs on the anniversary date of issuance, with the renewal window opening 60 days before expiration. The department fines independent contractors up to $5,000 per violation for performing work without an ICEC or workers compensation coverage, for working on a revoked or suspended certificate, for transferring a certificate to another person, and for misrepresenting independent contractor status. The ICEC is not a substitute for the Construction Contractor License when you meet the definition of a construction contractor. It answers the workers compensation question, not the contracting question. General contractors and property managers across Montana ask subcontractors for the ICEC number before letting them on site, because engaging a licensed construction contractor limits the hiring party's liability for workers compensation, unemployment insurance, wages and fringe benefits under 37-45-202. That single statute is why your certificate number gets requested before your equipment brochure does.
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The money side of Montana contractor licensing is small compared with most states. The Department of Labor and Industry lists a non refundable application fee of $70 for the Construction Contractor License and a renewal fee of $70. The renewal period runs on the anniversary date of issuance rather than a fixed statewide date, and the renewal window opens 60 days before the expiration date. Continuing education is listed as not required. The department FAQ ties those amounts to administrative rule 24.227.401 and to 37-45-203, which directs that fees collected be deposited in a special revenue account for administration and enforcement, and that the department run a consumer and industry education program on contractor licensing in cooperation with building industry stakeholders. Fines collected under 37-1-109 or 37-1-406 go to the uninsured employers fund. There is no state surety bond requirement attached to the Construction Contractor License and no state minimum for general liability insurance. Workers compensation coverage is the insurance the state actually checks. If you are relocating an existing out of state business, the department notes that it will help verify out of state licenses through online verification portals when available, and that if all other licensing requirements are met it can issue a provisional license with a reservation of rights that acts as an active full license for 60 days while verification finishes. That provision lets a Kalispell start date survive a slow verification from another state.
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Montana checks insurance, not aptitude. Section 37-45-201 says an individual or business entity may not engage in business as a construction contractor without a current license, and the license must include the applicant's social security number, proof of compliance with workers compensation laws, the IRS employer identification number if any, and the name and address of each partner, the individual owner, the corporate officers and registered agent, or the manager of a manager managed limited liability company or the members of a member managed limited liability company along with the registered agent. Section 37-1-137 applies to everyone on that list. The department FAQ spells out the hiring checklist: cover your employees under a Montana workers compensation insurance policy, check requirements with the Unemployment Insurance Division and the Department of Revenue, and apply for the construction contractor license under 37-45-102. It also tells applicants to register a business name other than a personal name with the Montana Secretary of State, reachable at (406) 444-3665, and suggests doing that step before submitting the license application. For an HVAC company this ordering matters. Set up the entity, get the policy bound, then apply. A lapse in the workers compensation policy is the most common way a Montana contractor license goes sideways, because the coverage is the substantive condition the license certifies. Technicians riding along on a helper basis during a busy Missoula August are employees for this purpose unless they hold their own certificate.
Montana licenses electricians through the State Electrical Board, and the exemptions in 37-68-103 do not carve out mechanical contractors. Subsection six is the clause HVAC companies rely on: the chapter does not prohibit a vendor of an electrical appliance from selling, delivering and connecting that appliance if the connection does not necessitate the installation of electrical wiring of the structure. Plugging a unit into an existing approved outlet does not make you an installer under subsection five. Running a new circuit, setting a disconnect, or feeding a new air handler panel does. That work requires a licensed electrician, and an electrical contractor license requires a Montana licensed master electrician as the responsible party for the business. The board states that the responsible electrician's license determines the level of the contractor license and what electrical work may be performed, and that a master electrician as responsible party allows the firm to perform residential, commercial, industrial and institutional work. A journeyman may serve as the responsible party only for residential construction of fewer than five living units in a single structure. Electrical contractor applicants must show compliance with Montana workers compensation and unemployment insurance or hold an Independent Contractor Exemption. Montana HVAC firms typically choose one of two structures: add an electrical contractor license with a master on staff, or sub the electrical portion to a licensed firm. Under rule 24.227.2301 the second option obliges you to confirm that sub is actually licensed.
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Montana's plumbing statute is narrower than HVAC contractors expect. The definition of a plumbing system in 37-69-101 covers potable water supply and distribution pipes, plumbing fixtures and traps, drainage and vent pipes, and building drains within the property lines up to 20 feet beyond the building foundation line, and it includes potable water piping, water heaters and vents. Fuel gas piping is not named in that definition. A journeyman plumber is described as authorized to install sanitary plumbing and potable water supply piping and appliances connected to that piping, and a master plumber may plan, estimate, bid, contract for and supervise plumbing work. So the plumbing license reaches the condensate tie in and the water side of a hydronic or domestic hot water job, and the code rather than a plumbing license governs the gas piping to your furnace. Montana adopted the 2021 International Fuel Gas Code, which is what the inspector will hold that piping to. The Board of Plumbers requires four hours of continuing education completed during the renewal cycle under ARM 24.180.2102. FY 26 plumbing license renewals open July 2, 2026 and are due by September 1, 2026, and the board states the renewal fee is fully abated, though late fees still apply. If your HVAC company installs water heaters or boiler piping in Montana, put a licensed plumber on that portion and read the fixture table the board publishes.
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Hydronic heating is common across Montana, and boilers get their own state program rather than falling under a mechanical license. The Department of Labor and Industry runs a Boiler Operator Program that licenses and regulates boiler operators, administered out of 301 South Park Avenue in Helena and reachable at (406) 444-6880. Separately, the Building Codes Program performs annual inspections of boilers and elevators as part of its statutory safety role. Montana has adopted the American Society of Mechanical Engineers Boiler and Pressure Vessel Code, 2021 edition, effective November 6, 2021, and ASME CSD-1, Controls and Safety Devices for Automatically Fired Boilers, 2018 edition, effective the same date. Those two documents drive what an inspector looks for on a commercial boiler replacement in Great Falls or Butte, and they are adopted separately from the building code package that took effect in June 2022. For an HVAC contractor the working distinctions are these. Installing the boiler is construction contracting, so the Construction Contractor License applies. Operating a boiler above the program thresholds is a licensed activity in its own right, which matters if you staff a school district or hospital plant. The annual state inspection is not your permit and does not substitute for one. Commercial bids in Montana that include boiler work should price the CSD-1 control requirements explicitly, because the controls and safety device package is where retrofit bids most often come in short against what the inspector will pass.
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Montana adopts one statewide code package, amended through Administrative Rules of Montana Title 24, chapter 301. The Building Codes Program lists the mechanical set as the 2021 International Mechanical Code and the 2021 International Fuel Gas Code, both effective June 11, 2022. Alongside them sit the 2021 International Building Code, the 2021 International Residential Code, the 2021 International Existing Building Code, the 2021 Uniform Plumbing Code, the 2020 National Electrical Code, the 2021 International Energy Conservation Code, NFPA 99 for medical gas in its 2018 edition, and the 2021 Wildland Urban Interface Code. A city, county or town may adopt a building code by ordinance, but a local building code may include only codes adopted by the Building Codes Program. That is the sentence that keeps Montana consistent. A Whitefish inspector and a Billings inspector are working from the same mechanical code, with the same state amendments, and neither may adopt a mechanical code the state has not adopted. For an HVAC contractor bidding across the state, that means one set of duct, combustion air, venting and fuel gas rules from Sidney to Hamilton, and one energy code governing the equipment efficiency and the envelope your load calculation assumes. It also means a public hearing on the next code adoption is a statewide event rather than a city by city fight. Check the program page for the current adoption before quoting an equipment package on a long lead commercial job.
Montana splits permitting between one state office and a set of certified local programs. The Building Codes Program sits inside the Building and Commercial Measurements Bureau of the Business Standards Division, and it issues permits and performs inspections for building, plumbing, electrical and mechanical work, plus elevator and boiler programs. Cities, counties and towns may enforce local building, electrical, plumbing and mechanical codes in whole or in part, except for state owned agencies, which must be permitted through the department. Local programs must be certified by the Building Codes Program. Every city, county and town that has not taken that step falls under state jurisdiction, and the program keeps field inspectors positioned around Montana to cover them. Certification is conditional and ongoing. A local program must file its current adopted code, a current fee list and a current enforcement plan for approval, submit annual reports under ARM 24.301.207, and in some cases submit an independent fiscal audit under ARM 24.301.208. Inspectors who inspect or approve installations that would require state licensure if done commercially must themselves hold a current state journeyman license in that craft or be certified by an approved national testing body. The state permit office sits at 2705 Skyway Drive in Helena, with applications filed through the department's online portal, and the bureau answers at (406) 841-2056 or buildingcodes@mt.gov. Ask which authority covers the address before you quote, not after.
The state publishes the full roster of certified local programs with the code types each one enforces. Mechanical enforcement, marked M on that list, is in place in Billings, Bozeman, Great Falls, Helena, Kalispell, Missoula city and Missoula County, Whitefish, Columbia Falls, Belgrade, Polson, Manhattan, Hamilton, Darby, Stevensville and Silver Bow County. Billings and Great Falls are listed for plumbing as medical gas only, so ordinary plumbing there stays with the state while mechanical does not. Bozeman, Whitefish and Columbia Falls also enforce the Wildland Urban Interface Code, which changes equipment siting and exterior detailing on foothill work. A long list of smaller jurisdictions enforces building code only: Choteau, Conrad, Cut Bank, Glasgow, Havre, Lewistown, Red Lodge, Ronan, Shelby, Sidney, Richland County and others. Several are residential only, including Colstrip, Deer Lodge County, Hardin, Libby, Troy and West Yellowstone. Most certified programs cover city limits alone, so a job a mile outside Bozeman or Kalispell is a state permit even though the job across the street is not. Missoula County and Silver Bow are the notable countywide programs. Billings requires online submission for all permits through its public portal, and the Building Division sits at 316 N 26th Street, fifth floor, reachable at (406) 657-8270 or permits@billingsmt.gov. Build that lookup into your estimating process, because the permit authority changes the timeline more than the equipment does.
Montana does not run a trade title system for HVAC, so there is no protected title such as licensed HVAC contractor to claim or misuse. What you may claim is that you hold a Montana Construction Contractor License, and that claim has to be true and current. Under 37-1-316 a misleading, deceptive, false or fraudulent advertisement or other representation in the conduct of the profession or occupation is unprofessional conduct for any Montana licensee, as is signing or issuing a document in your professional capacity that contains a false or misleading statement. Advertising a license you do not hold, implying a state mechanical credential that Montana does not issue, or naming a master electrician who has left the company are all reachable under that section. The construction contractor rule adds the reporting duties: notify the department within 30 days of any change to ownership or business name and any change in officers, members or partners reported to the Secretary of State. A truck wrap or website carrying a business name that no longer matches your license record is a compliance problem before it is a marketing problem. Montana statute does not impose a separate requirement to print a contractor license number on advertising, vehicles or written estimates. Publishing it anyway is the practical move, because Montana buyers can check it in seconds and a visible number shortens the trust conversation on a cold January no heat call.
Montana rewrote the penalty side along with the license. Section 37-45-302 says that in addition to the penalties in 37-1-406, a department determination of unprofessional conduct under 37-45-301 subjects the violator to a penalty of up to $5,000 as determined by the department, and to suspension or debarment of rights to public works contracts. Penalties collected go into the uninsured employers fund established in 39-71-503. The public works debarment is the part that should get attention from any Montana HVAC firm that bids school districts, county buildings or state facilities, because losing eligibility costs far more than the fine. On the independent contractor side the department fines up to $5,000 per violation for working without an ICEC or workers compensation coverage, for working on a suspended or revoked certificate, for transferring a certificate, and for misrepresenting independent contractor status. Engaging a person to perform work for which that person is not licensed is itself unprofessional conduct under rule 24.227.2301, which puts the general contractor and the mechanical contractor on the hook for the trades they hire. Separate from licensing, working without a required mechanical permit exposes the job to stop work and to correction at your cost, since the permit is what creates the inspection record. In Montana the cheapest compliance step is also the simplest one: keep the license current, keep the workers compensation policy bound, and pull the permit.
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No Montana license covers refrigerant, and the state has no refrigeration credential at all. The requirement is federal. EPA regulations at 40 CFR Part 82, Subpart F, issued under Section 608 of the Clean Air Act, require that technicians who maintain, service, repair or dispose of equipment that could release ozone depleting refrigerants be certified. EPA publishes four test areas: Core, Type I for small appliances, Type II for high pressure equipment, and Type III for low pressure equipment. Universal certification covers all three equipment types. EPA does not issue the certification cards itself. Testing and card issuance run through approved certifying organizations, and EPA maintains the list of technician certification programs along with the procedure for replacing a lost card. For a Montana HVAC company this is the one technical credential that actually gates work. A tech in Helena can legally install duct with no certificate of any kind, and cannot legally open a sealed refrigerant circuit without the right Section 608 type. Keep copies of every technician card on file, because the certification belongs to the individual rather than to your company and it does not expire. When you hire, the card is the first document to ask for. When a customer asks what makes your crew qualified in a state with no HVAC license, the 608 type and the manufacturer training are the honest answer.
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Montana keeps the verification path short. The Department of Labor and Industry runs a public license search that covers the professional boards and programs, including the Construction Contractor License, the Independent Contractor Exemption Certificate, electrical licenses and plumbing licenses. A homeowner in Missoula can confirm whether a contractor is licensed and whether complaints exist, and the department also publishes a complaint filing path on the same site. License verification requests and licensee mailing list requests run through the department's online portal at ebiz.mt.gov. Because Montana licenses the business entity rather than an HVAC trade, the search tells a buyer three useful things and one thing it cannot. It confirms the contractor license is current, it confirms the entity name matches the one on the proposal, and it surfaces the electrical or plumbing license of whoever is doing that portion. It cannot tell anyone whether a technician knows how to commission a heat pump in a Butte winter, because Montana never tested that. That gap is an opening for a contractor who publishes proof instead of adjectives: the license number, the Section 608 types the crew holds, the permit numbers on recent jobs, and manufacturer certifications. For state owned projects, remember that permitting runs through the department rather than the local program, so the inspection record lives with the state. Buyers should also confirm the workers compensation policy, since that coverage is what the license certifies.
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These are common details other guides publish about Montana, but we could not verify them from the agency source. Confirm them directly before relying on them.
No. The Department of Labor and Industry supervises boards and programs for electricians, plumbers, boiler operators, elevator mechanics and others, and none of them cover HVAC or refrigeration. What applies is the Construction Contractor License, plus a licensed electrician or plumber for those portions of the job, plus the mechanical permit.
House Bill 239 from the 2025 session replaced contractor registration with a Construction Contractor License administered by the Department of Labor and Industry. Contractors who held an active Montana registration as of December 31, 2025 were converted to the new license. The governing law moved to Title 37, chapter 45 of the Montana Code Annotated.
The department lists a non refundable application fee of $70 and a renewal fee of $70. Renewal runs on the anniversary date of issuance and the window opens 60 days before expiration. Continuing education is listed as not required. Those amounts are set by administrative rule 24.227.401 under 37-45-203.
Montana requires an independent contractor to either self elect workers compensation coverage or hold an Independent Contractor Exemption Certificate under 39-71-417. The ICEC costs $125 to apply and $125 to renew, needs no test, and requires business documentation for each listed occupation. It does not replace the Construction Contractor License if you meet the contractor definition.
Section 37-45-104 exempts one undertaking of a casual, minor or inconsequential nature where the aggregate contract price for labor, materials and all other items is less than $2,500 a job. The exemption fails if the work is part of a larger operation or if a job is divided into smaller contracts to evade the chapter.
Not without an electrical license. Montana law at 37-68-103 lets a vendor connect an appliance only when the connection does not require installing electrical wiring of the structure. A new circuit or disconnect is licensed electrical work. An electrical contractor license requires a Montana licensed master electrician as the responsible party.
The plumbing system definition in 37-69-101 covers potable water supply and distribution, fixtures and traps, drainage and vent pipes, building drains, water heaters and vents. Fuel gas piping is not named there. Gas piping is governed by the 2021 International Fuel Gas Code that Montana adopted effective June 11, 2022, enforced through the permit and inspection.
The 2021 International Mechanical Code and the 2021 International Fuel Gas Code, both effective June 11, 2022, amended by Administrative Rules of Montana Title 24, chapter 301. The 2020 National Electrical Code and the 2021 Uniform Plumbing Code apply to the related trades. A local jurisdiction may adopt only codes the state program has adopted.
The state. Cities, counties and towns may enforce building, electrical, plumbing and mechanical codes only after certification by the Building Codes Program, and everywhere else falls under state jurisdiction. Most certified programs cover city limits only, so a job just outside Bozeman or Kalispell is a state permit. Missoula County and Silver Bow are countywide.
Section 37-45-204 makes the state provisions on registration, licensing, bonds and fees exclusive for registered construction contractors, and says a political subdivision may not require or issue registrations, licenses or bonds for the same or a similar purpose. A local government may still levy a general, nondiscriminatory business license fee applied to all businesses.
A department determination of unprofessional conduct under 37-45-301 carries a penalty of up to $5,000 plus suspension or debarment of rights to public works contracts, on top of the penalties in 37-1-406. Independent contractors face fines up to $5,000 per violation for working without an ICEC or workers compensation coverage.
Yes. EPA rules at 40 CFR Part 82, Subpart F require certification for technicians who maintain, service, repair or dispose of equipment that could release ozone depleting refrigerants. The test areas are Core, Type I small appliances, Type II high pressure and Type III low pressure. EPA does not issue the cards; approved certifying organizations do.
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