Grunau History

  • Grunau History 1920

    1920

    Paul J. Grunau establishes Grunau Company for plumbing and repair services

  • Grunau History 1923

    1923

    Grunau Company adds heating system installation to offered services

  • Grunau History 1929

    1929

    Grunau Company adds fire protection systems to its capabilities

  • Grunau History 1929

    1929

    Paul E. Grunau joins Grunau Company to help manage the business

  • Grunau History 1960

    1960

    Grunau Company adds sheet metal services

  • Grunau History 1962

    1962

    Gary Grunau joins Grunau Company as 3rd generation of family leadership

  • Grunau History 1967

    1967

    Grunau Company expands to Indianapolis, IN

  • Grunau History 1977

    1977

    Grunau Company adds specialty metals to its capabilities

  • Grunau History 1980

    1980

    Grunau Company expands to Pittsburgh, PA

  • Grunau History 1982

    1982

    Grunau Company expands to Orlando, FL

  • Grunau History 1990

    1990

    Paul W. Grunau joins Grunau Company marking the 4th generation of family leadership

  • Grunau History 1994

    1994

    Grunau Company expands to Youngstown, OH

  • Grunau History 1999

    1999

    Grunau Company brands its specialty metals division as Grunau Metals

  • Grunau History 2003

    2003

    Grunau embraces the Lean Construction culture

  • Grunau History 2005

    2005

    Grunau is first Wisconsin mechanical contractor to have LEED Accredited Professionals on staff

  • Grunau History 2006

    2006

    Grunau Company is acquired by APi Group, a family of specialty contractors

  • Grunau History 2007

    2007

    Grunau Company expands to Ft Myers, FL

  • Grunau History 2009

    2009

    Larry Loomis becomes President of Grunau Company

Click the years above or scroll to read Grunau's history.

Grunau Logo 2
I would like to extend a 'huge' thank you to the Grunau team for the effort that took place in fixing the water main break at our corporate headquarters. The team performed admirably and demonstrated your company's dedication to exceeding its customers' expectations. Please pass on my sincere thanks for a job well done.”
- Ward Komorowski, Director, Facilities and Building Services at Johnson Controls, Inc.
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