Montana (MT) Building Permit & Cost Directory
Explore municipal permit requirements, Bureau of Labor Statistics (BLS) contractor wages, and real-time residential cost calculators across all 56 counties in Montana for 2026.
Montana Residential Building Code & Licensing Overview
Statewide compliance standards and contractor mandates
Residential home renovations in Montana are regulated under the state building code adapted from the International Residential Code (IRC). Permits are mandated for all structural repairs, complete roof replacements exceeding 100-200 square feet, HVAC compressor and furnace retrofits, and electrical service upgrades.
General contractors and trade specialists must carry valid state licenses and verified worker's compensation coverage.
Homeowners may pull permits on their primary dwelling, assuming full civil liability for code compliance and passing inspections.
Find Your County in MT
Type your county or city name below to instantly isolate local building departments and cost calculators.
All Montana Counties (56)
Click any county below to calculate local permit costs, view inspector notes, and check trade wages.
Beaverhead County
Est. Permit: $133 • BLS $28.47/hr
Big Horn County
Est. Permit: $133 • BLS $28.47/hr
Blaine County
Est. Permit: $133 • BLS $28.47/hr
Broadwater County
Est. Permit: $133 • BLS $28.47/hr
Carbon County
Est. Permit: $133 • BLS $28.47/hr
Carter County
Est. Permit: $133 • BLS $28.47/hr
Cascade County
Est. Permit: $133 • BLS $28.47/hr
Chouteau County
Est. Permit: $133 • BLS $28.47/hr
Custer County
Est. Permit: $133 • BLS $28.47/hr
Daniels County
Est. Permit: $133 • BLS $28.47/hr
Dawson County
Est. Permit: $133 • BLS $28.47/hr
Deer Lodge County
Est. Permit: $133 • BLS $28.47/hr
Fallon County
Est. Permit: $133 • BLS $28.47/hr
Fergus County
Est. Permit: $133 • BLS $28.47/hr
Flathead County
Est. Permit: $133 • BLS $28.47/hr
Gallatin County
Est. Permit: $133 • BLS $28.47/hr
Garfield County
Est. Permit: $133 • BLS $28.47/hr
Glacier County
Est. Permit: $133 • BLS $28.47/hr
Golden Valley County
Est. Permit: $133 • BLS $28.47/hr
Granite County
Est. Permit: $133 • BLS $28.47/hr
Hill County
Est. Permit: $133 • BLS $28.47/hr
Jefferson County
Est. Permit: $133 • BLS $28.47/hr
Judith Basin County
Est. Permit: $133 • BLS $28.47/hr
Lake County
Est. Permit: $133 • BLS $28.47/hr
Lewis And Clark County
Est. Permit: $133 • BLS $28.47/hr
Liberty County
Est. Permit: $133 • BLS $28.47/hr
Lincoln County
Est. Permit: $133 • BLS $28.47/hr
Madison County
Est. Permit: $133 • BLS $28.47/hr
Mccone County
Est. Permit: $133 • BLS $28.47/hr
Meagher County
Est. Permit: $133 • BLS $28.47/hr
Mineral County
Est. Permit: $133 • BLS $28.47/hr
Missoula County
Est. Permit: $133 • BLS $28.47/hr
Musselshell County
Est. Permit: $133 • BLS $28.47/hr
Park County
Est. Permit: $133 • BLS $28.47/hr
Petroleum County
Est. Permit: $133 • BLS $28.47/hr
Phillips County
Est. Permit: $133 • BLS $28.47/hr
Pondera County
Est. Permit: $133 • BLS $28.47/hr
Powder River County
Est. Permit: $133 • BLS $28.47/hr
Powell County
Est. Permit: $133 • BLS $28.47/hr
Prairie County
Est. Permit: $133 • BLS $28.47/hr
Ravalli County
Est. Permit: $133 • BLS $28.47/hr
Richland County
Est. Permit: $133 • BLS $28.47/hr
Roosevelt County
Est. Permit: $133 • BLS $28.47/hr
Rosebud County
Est. Permit: $133 • BLS $28.47/hr
Sanders County
Est. Permit: $133 • BLS $28.47/hr
Sheridan County
Est. Permit: $133 • BLS $28.47/hr
Silver Bow County
Est. Permit: $133 • BLS $28.47/hr
Stillwater County
Est. Permit: $133 • BLS $28.47/hr
Sweet Grass County
Est. Permit: $133 • BLS $28.47/hr
Teton County
Est. Permit: $133 • BLS $28.47/hr
Toole County
Est. Permit: $133 • BLS $28.47/hr
Treasure County
Est. Permit: $133 • BLS $28.47/hr
Valley County
Est. Permit: $133 • BLS $28.47/hr
Wheatland County
Est. Permit: $133 • BLS $28.47/hr
Wibaux County
Est. Permit: $133 • BLS $28.47/hr
Yellowstone County
Est. Permit: $133 • BLS $28.47/hr
Frequently Asked Questions: Montana Building Permits
How much does a building permit typically cost in Montana?
Across Montana, the baseline residential permit filing fee averages $133.47. Total permit costs are calculated based on valuation formulas (typically $5 to $15 per $1,000 of project value) plus electrical, mechanical, and plan review inspection surcharges.
Do I need a building permit for roof replacement in Montana?
Yes. In virtually all Montana county jurisdictions, roof replacements involving more than 100 square feet (1 roofing square) or involving any structural decking, rafter, or truss repair require a formal building permit and at least one in-progress or final roof inspection.
What is the average trade wage for contractors in Montana?
According to the latest Bureau of Labor Statistics (BLS) Occupational Employment and Wage Statistics (OEWS), the median hourly rate for licensed residential construction trades in Montana is approximately $28.47/hr, varying based on metropolitan vs rural location.