Permits and licensing · Montana
Renovation permits and contractor licences in Montana
Montana changed its contractor rules recently: legislation passed in 2025 turned construction contractor registration into a state licence, and all construction contractors must now be licensed with the Department of Labour and Industry. Electricians and plumbers have their own state boards. Building codes are adopted for the whole state, but enforcement is split — a city or county may run its own certified code programme, and where none exists the state Building Codes Program issues permits and inspects.
Regulators and licensing bodies in Montana
These official bodies license contractors, oversee safety or issue permits in Montana.
Montana Building Codes Program
Part of the Business Standards Division at the Department of Labour and Industry, it adopts a uniform state building code enforced statewide for residential and commercial buildings, and issues permits and carries out inspections for building, plumbing, electrical, mechanical, elevator and boiler work. Cities, counties and towns may enforce local codes in whole or in part, and those local programmes must be certified by the state programme.
Montana Construction Contractor Licence Program
Licenses construction contractors. All construction contractors in Montana must be licensed with the Department; contractors who held an active registration on December 31, 2025 were converted to the new licence when the 2025 legislation took effect. The statute defines a construction contractor broadly, covering building, altering, repairing, adding to, moving, wrecking or demolishing structures for another.
Montana State Electrical Board
Handles the licensing and regulation of electricians in Montana, publishes its rules and board decisions, and requires licensees to complete continuing education under its administrative rule before renewing.
Montana Board of Plumbers
Handles the licensing and regulation of plumbers and medical gas endorsees, and answers scope-of-practice questions about what a given licence allows. It publishes the plumbing code edition the state has adopted.
Trades that need a licence in Montana
General contracting and renovation
Since January 2026 every construction contractor in Montana must hold a state licence, not just a registration. The statute reaches anyone who, in an independent business, offers to undertake, undertakes or bids to construct, alter, repair, add to, improve, move, wreck or demolish a building or other improvement attached to real estate for someone else, including roofing, siding and floor covering.
Sources:Montana Construction Contractor Licence Program(opens in a new tab)
Electrical work
Electricians are licensed by the State Electrical Board and must complete continuing education to renew. Check the licence yourself in the state Licensee Lookup rather than relying on a card, because the licence, not the company name, is what the board can act on.
Sources:Montana State Electrical Board(opens in a new tab)Montana – Licensee Lookup System(opens in a new tab)
Plumbing
Plumbers and medical gas endorsees are licensed by the Board of Plumbers, which will answer scope-of-practice questions about what a particular licence permits. Montana works to the 2021 Uniform Plumbing Code as amended by its administrative rules.
Sources:Montana Board of Plumbers(opens in a new tab)Montana Building Codes Program – Current codes(opens in a new tab)
Certified trades
Who inspects your job depends on where you live. Cities, counties and towns can run their own certified building, electrical, plumbing and mechanical code programmes, in whole or in part; everywhere else falls under the state Building Codes Program, which has inspectors positioned around the state. Ask which one covers your address before anyone applies for a permit.
Sources:Montana Department of Labour and Industry – Building codes and permits(opens in a new tab)
Consumer protection
The Licensee Lookup System is the state's primary source for verifying the credentials of Montana licensees, and it is free. The Department notes that it relies on licensees to keep their information accurate and that some disciplinary actions may not be posted immediately, so it is worth asking the board directly if something looks unclear.
Sources:Montana – Licensee Lookup System(opens in a new tab)Montana State Electrical Board(opens in a new tab)
Building and renovation permits in Montana
Montana adopts a uniform state building code that is enforced statewide for residential and commercial buildings. The codes currently in force, all as amended by the Administrative Rules of Montana, include the 2021 International Building Code, the 2021 International Residential Code, the 2021 International Existing Building Code, the 2021 Uniform Plumbing Code, the 2021 International Mechanical Code, the 2021 International Fuel Gas Code, the 2021 International Energy Conservation Code and the 2020 National Electrical Code. The permit comes from a certified local programme where one exists and from the state Building Codes Program where none does. Billings requires all permits to be submitted through its online portal; Missoula's building department applies the state adopted code and its building official is the authority having jurisdiction.
Sources:Montana Building Codes Program – Current codes(opens in a new tab)Montana Department of Labour and Industry – Building codes and permits(opens in a new tab)Missoula – Development Services(opens in a new tab)
Permit information from large municipalities
Before you hire a contractor in Montana
Practical checks you can do yourself, using official tools where they exist.
Check the contractor's licence in Montana's Licensee Lookup System before you sign.
Official lookup: Montana – Licensee Lookup System(opens in a new tab)
Ask whether your city or county runs a certified local code programme or whether the state inspects your job.
Official lookup: Montana Department of Labour and Industry – Building codes and permits(opens in a new tab)
For electrical or plumbing work, confirm the tradesperson holds a current board licence in their own name.
Official lookup: Montana State Electrical Board(opens in a new tab)
Check which code editions apply before the plans are drawn.
Official lookup: Montana Building Codes Program – Current codes(opens in a new tab)
Get the scope, materials and price in writing, and proof of insurance, before work starts.
Official lookup: FTC – How to avoid a home improvement scam(opens in a new tab)
Sources for renovation permits and licences in Montana
Every fact on this page comes from these official sources.
- Montana Department of Labour and Industry – Building codes and permits(opens in a new tab)
- Montana Building Codes Program – Current codes(opens in a new tab)
- Montana Construction Contractor Licence Program(opens in a new tab)
- Montana State Electrical Board(opens in a new tab)
- Montana Board of Plumbers(opens in a new tab)
- Montana – Licensee Lookup System(opens in a new tab)
- Missoula – Development Services(opens in a new tab)
- FTC – How to avoid a home improvement scam(opens in a new tab)
Find licensed pros
Compare local pros for the regulated trades in this guide, then confirm their licence with the regulator before you hire.
Renovation permits in other states
- Alabama
- Alaska
- Arizona
- Arkansas
- California
- Colorado
- Connecticut
- Delaware
- District of Columbia
- Florida
- Georgia
- Hawaii
- Idaho
- Illinois
- Indiana
- Iowa
- Kansas
- Kentucky
- Louisiana
- Maine
- Maryland
- Massachusetts
- Michigan
- Minnesota
- Mississippi
- Missouri
- Nebraska
- Nevada
- New Hampshire
- New Jersey
- New Mexico
- New York
- North Carolina
- North Dakota
- Ohio
- Oklahoma
- Oregon
- Pennsylvania
- Rhode Island
- South Carolina
- South Dakota
- Tennessee
- Texas
- Utah
- Vermont
- Virginia
- Washington
- West Virginia
- Wisconsin
- Wyoming
Planning a renovation?
Describe your project once and hear from local pros. Ask each one for their licence and permit details before you hire.