Built on Values

The Grunau Experience

Grunau Company has been the benchmark of excellence since 1920. From concept to commissioning, we have the expertise and experience to collaborate on your next project. You will find Grunau’s professional approach combined with our innovative use of the newest technology and work philosophies create a unique business relationship: The Grunau Experience. We are focused on your success and provide the best overall value to you and your project.

Grunau is a mechanical systems and fire protection union contractor headquartered in the greater Milwaukee area who specializes in any size commercial or industrial project in a variety of industries. Check out industry specifics in our Project Gallery, including Fire Protection projects from all of our locations. The majority of our mechanical work is completed throughout southern Wisconsin as far west as Madison and as far north as Green Bay. However, client relationships have taken us all over the United States.

Mechanical Systems Engineering & Contracting

Our mechanical systems capabilities include HVAC (heating, ventilation, and air conditioning), plumbing, process piping, electrical, refrigeration, fire protection, and underground site utilities. Our branded Grunau Metals focuses on structural & specialty metals fabrication and installation. We are your full service mechanical systems resource.

Grunau also specializes in fire protection with offices in Milwaukee, WI; Indianapolis, IN; Youngstown, OH (Boardman); Pittsburgh, PA (Moon Township); and Orlando, FL.

We work to understand your vision and bring your ideas to life. Whether it’s small and simple, or large and complicated, Grunau Company is right for your job. Customer focused. Built on values.