STATE LICENSE
ConditionalMontana Department of Labor & Industry — …
No Montana statute licenses HVAC or mechanical contractors as a trade. An HVAC business that installs, alters, or repairs systems in buildings for others falls under the general Construction Contractor License (MCA 37-45-201) if it has employees, and refrigerant handling requires federal EPA Section 608 certification.
The licensed-trade boundaries still bind HVAC work: line-voltage electrical connections fall under the State Electrical Board (MCA 37-68-301), though work at 90 volts or less — such as typical thermostat wiring — is exempt (MCA 37-68-103(9)). Mechanical permits, including gas piping pressure tests, come from certified cities and counties or the state Building Codes Program, which in its own jurisdiction exempts residential buildings of fewer than five dwelling units.
The state sets the license floor; the county or city permit office controls filing, inspections, and local rules wherever the job site sits.
MCA 37-45-204 makes the state construction contractor provisions exclusive: a city or county may not require or issue registrations, licenses, or bonds for the same or a similar purpose, though it may levy a general, nondiscriminatory business license fee on all businesses and may regulate contractors the chapter does not cover. Building codes are enforced by cities and counties certified by DLI's Building Codes Program; everywhere else, the state program issues permits and inspects.
The local offices section below names the exact permit desk for every Montana county on file.
Each row names the issuing authority, cost, timeline, citation, and status behind the requirement — verified against the official source.
Published fees from the issuing authorities, as of October 2026. Local permit fees vary by project and jurisdiction — the basis is stated where a flat number does not exist.
Montana has no trade-specific HVAC license. The only state credential is the general Construction Contractor License, which carries no exam, experience, bond, or insurance minimum beyond workers' comp.
Any electrical or plumbing work inside the job needs a Montana-licensed electrician or plumber; those licensees are themselves exempt from the CCL within their license scope (MCA 37-45-104(16)).
Mechanical permit holders must call for gas piping pressure tests, rough-in, and final inspections, with 48 hours' notice.
A practical sequence for a new HVAC contractor in Montana. Actual agency processing times are noted in the ledger above.
Each item names the issuing authority, cycle, and citation.
Statutory consequences with their citations — not estimates, not “commonly cited” guesses.
DLI may issue a cease-and-desist order to anyone practicing a Title 37 occupation without the required license, then enforce it in district court; officers and members who knowingly take part are personally liable.
Fraud, misclassifying workers without an ICEC, or failing workers' comp, unemployment, or wage law triggers program sanctions plus a chapter-specific penalty.
Inside city limits, the city office listed here issues the permit; the county office serves unincorporated areas. Every office links to its official page.
Every fact in this file was checked against these official sources on October 2026.
Pending verification: Length of the Construction Contractor License term: DLI says it renews on the anniversary of issuance with the window opening 60 days before expiration, but does not state whether the term is one year or two (the repealed registration's term was not re-confirmed) · How the no-employee exemption in MCA 37-45-104(24) applies to corporations and manager-managed LLCs: DLI's FAQ says those entities need a CCL 'regardless of employee count,' while the statute exempts an 'independent contractor who has no employees' — the rule text reconciling them was not retrieved · Text of ARM Chapter 24.227 (rules.mt.gov not retrieved); the $70 fee and 30-day change-notice rule come from DLI's checklist and FAQ summaries of it · MCA 37-45-204 still refers to 'registered' construction contractors after the 2025 recodification; that the local-licensing bar applies equally to CCL licensees is presumed, not confirmed · Whether any Montana city imposes its own mechanical or gas-fitter competency license despite the MCA 37-45-204 bar on local contractor licensing
General information, not legal advice. Always confirm requirements, deadlines, and forms with the issuing authority before filing or contracting.
Store licenses, permits, policies, and renewal dates in one place.