About Western Interstate


Western Interstate, Inc. has been a licensed general contractor in the state of Montana, completing commercial construction and industrial work since it was founded in 1987.

Western Interstate is currently led by Mark Quinn. Mark has decades of experience in commercial construction, including steel buildings and multi-family construction projects as well as an engineering background and skill in contract management. Western Interstate connects with a network of reputable sub-contractors and suppliers, to help drive construction projects to successful completion every time.

Western Interstate Construction has been a trusted partner on commercial construction projects for the University of Montana, Town Pump of Montana, Bonneville Power Administration and more. Visit our Projects page for more information.


Western Interstate has completed a multitude of successful commercial construction projects, establishing a good working relationship between the owners, reputable subcontractors, and suppliers, all essential to project completion.


We are capable and experienced in all types of contractual arrangements, from firm, lump-sum contracts, to cost reimbursable, guaranteed-not-to-exceed contracts.


Western Interstate operates under the direction of its President, Mark Quinn, who brings a lifetime of design and construction experience to the Company’s operations.


We are readily available to assist project owners in their commercial construction project development, from initial concepts, through final design to successful completion.