About Grunau

Established in 1920, Grunau Company strives to build positive, long-lasting relationships. These unique relationships allow us to gain insight and knowledge about our customers, their businesses, and their objectives. As a result, our customers are comfortable working with us, and expect (and receive) excellent outcomes.

Mechanical Contractor Services

We help customers analyze how they can save time, money, and energy, and get the most value from a project. Grunau Company, along with its sister division, Grunau Metals, operates a number of trades under one roof, enabling us to offer design, installation, and service of the following systems:


Our Grunau headquarters, located in Oak Creek, Wisconsin, serve our mechanical and Grunau Metals clients. Fire protection offices are located in Wisconsin, Florida, Indiana, Ohio, and Pennsylvania.

Visit the Locations page for more details. Contact us to learn more about our mechanical contractor services.