| Company Name | City | License |
|---|---|---|
| GTL, Inc. | Missoula | |
| Sapphire Construction Services LLC | Kalispell | |
| ALLWEST Testing and Engineering, Inc. | Missoula | |
| Woith Engineering | Missoula | |
| Star Electric of Montana, Inc | Kalispell | |
| City of Missoula | Missoula | |
| Dowl | Butte | |
| Raptor Plumbing LLC | Florence | |
| Montana Plumbing Company | Missoula | |
| Time Rental | Missoula | |
| Interior Technology Inc | Lynnwood | |
| Harding Civil Construction | Ronan | |
| KLJ | Great Falls | |
| Northfork Builders | Bozeman | |
| Petra, Inc. | Meridian | |
| Wildhorse RV Resort | Big Arm | |
| Northern Rockies Engineering, Inc. | Sheridan | |
| IMPACT Drafting & Design, inc. | Bozeman | |
| SMA Architects | Helena | |
| Northern Engineering & Consulting | Billings | |
| Domo Design Build | Missoula | |
| Yellowstone National Park Lodges | Mammoth | |
| Missoula Redevelopment Authority | Missoula | |
| CTA Architects Engineers, Billings | Billings | |
| Helena Plans Exchange | Helena | |
| Pigman Builders | Hamilton |