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Reum Custom Building is the premier construction company in Northwest Montana. We specialize in ground up construction of residential and commercial building. As our name suggests, we put the emphasis on custom work, tailored to the clients needs.

Headed by General Contractor James Reum, we have been in business for over a decade in the valley. James brings customers a personalized experience and focuses on being involved in the process from start to finish. 

From new construction to remodels to commercial and industrial projects, let James and his team work with you to give you the most efficient, comprehensive process available. If your style is modern industrial or rustic elegance, we will work with you to help you design your perfect project. 

Roofing, decks, remodels, and other home maintenance and specialty requests are among the services provided by Reum Custom Building.

We look forward to hearing from you and helping you build your dreams. Please visit our Testimonials page for reviews from our satisfied customers. 

Our Team

James Reum-Owner

Cell: (406)250-0212

James Reum is the owner of Reum Custom Building, a custom construction

business registered in the State of Montana as a Limited Liability Company. 

James aims to be the partner of choice to the residential and commercial

customer by focusing on an ethical approach that emphasizes honesty and

integrity throughout the entire process. He fully immerses himself into every

aspect of each new construction, renovation, and remodel project.

Specializing in high end new custom residential homes, he also endeavors to

work with customers to help conceptualize and redesign their existing spaces. 

Like many contractors, James developed an affinity for the building arts in his early years. Driven by a kindling enthusiasm for construction, he endeavored to build his own home which he completed in 2006. The following year, he decided to share his talent off, officially starting Reum Custom Building in 2007. 

Since then Reum Custom Building has had many notable accomplishments in the construction trade. James worked on the Yellowstone Club/Warren Miller Lodge, built his first restaurant in 2009, and in 2015 was the General Manager of his first custom home over $1 Million. One of his most publicized homes was a lodge in Lakeside that was given a spread in Log Cabin Homes magazine in March 2015.

James's long-term vision is to be the pre-eminent luxury home builder in the Flathead Valley, providing a superior product and incomparable customer experiences by maintaining a client-centric approach to every facet of each build.


Elise Reum-Owner/Accountant

Cell: (406)250-1731

Elise Reum is the wife of James Reum and co-owner of Reum Custom Building.

She has been actively involved in the inner-workings of Reum Custom Building 

for over 10 years. Public relations and advertisement are her fortes.

She is very passionate about her role in the business and aims to assist her

husband in becoming the most highly sought after builder in the Flathead



Elise is an RN and mother of two children, a boy and a girl. She us currently going to Nurse Practitioner School in order to further her career in the health care field. In her off time she loves to spend time with her family hiking, snowmobiling, and boating. 

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