• Grunau Headquarters
  • Grunau Staff
  • Grunau Metal Work
  • Grunau Fire Protection
  • Grunau Fire Protection

The Grunau Experience

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.

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 Projects list, including Fire Protection and Process Piping. The majority of our work is completed throughout southeastern Wisconsin as far west as Madison and as far north as Green Bay, WI. However, client relationships have taken us all over the United States.

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 specialty metals fabrication. We are your full service mechanical systems resource.

Grunau also has fire protection offices in Indianapolis, IN; Youngstown, OH (Boardman); Pittsburgh, PA (Moon Township); Orlando, FL; and Fort Myers, FL.

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. Customer focused. Built on values.

BIM Virtual Tour

BIM Video

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Grunau Mechanical proved once again to be among the best and has been chosen as one of our top area subcontractors!”
- Steven G. Chamberlin, Former President at CG Schmidt, Inc.