About Us

Demien Construction is a full service General Contractor that offers capabilities from traditional construction to complete turnkey design build services. We understand building codes and are able to provide a wide array of the best products and the most competent services to meet the individual needs of your project.

Demien Construction does more than build buildings; we build relationships. Client relationships flourish because Demien Construction is committed to meeting each patron’s specific needs. Professionalism, reliability and quality workmanship are the hallmarks of our partnerships. Our reputation stands firmly on the quality of our work and on our choice of partners.

We are especially proud to be a building partner with Butler Manufacturing™ the largest network of construction professionals in the world.

Company History

Demien Construction developed its reputation through two generations of commitment to building for a better community. Ralph Demien laid the company foundation in 1956. Today his family members, David Demien, Russell Demien and Larry Juern, continue his original commitment to excellence. With more than 50 years of experience in the construction industry, we bring expert design skills, quality craftsmanship and superior materials to each project.

Serving the greater St. Louis area and beyond, Demien Construction’s office is located in Wentzville, Missouri. We are proud to have been a key player in the development of Missouri’s rapidly expanding communities. Today the company continues its commitment to building for a better future.

Community Involvement

  • Rotary
  • Tri-County Builders
  • Habitat For Humanity
  • YMCA
  • Chamber of Commerce
  • St. Charles County Lutheran High School
  • St. Charles County Community College

We Support

  • 4-H
  • Therapeutic Horsemanship
  • United Services
  • YMCA
  • Wentzville Rotary
  • St. Charles County Lutheran High School
  • Noah's Ark Day Care


Our commitment is to create a cost-effective, high-performance facility that will meet your needs and that will enrich the community where it resides."