Renovation & Retrofit

Hermanson Company has long held the reputation as a mechanical contractor who can get the tough job done well.  As a result, we have specialized in difficult, mission-critical remodel and retrofit projects.  Our clients are confident of Hermanson’s ability to complete massive improvements to building mechanical systems within strict schedule and budget perimeters.
  King County Courthouse Seismic Restoration
King County Courthouse Seismic Restoration
Seattle, Washington
Construction was completed on time for this major renovation replacing plumbing and HVAC systems throughout the historic structure.


  William Kenzo Nakamura United States Courthouse
William Kenzo Nakamura United States Courthouse
Seattle, Washington
Hermanson Company was the Design-Build mechanical contractor for this complete renovation of a National Historic Registered Federal Building.

  1200 Third Avenue
1200 Third Avenue
Seattle, Washington
Hermanson provided mechanical Design-Build construction for the shell & core and tenant improvement work on the top four floors – 48,000 s.f. of this older office building.

  Microsoft Buildings 16, 17, & 18
Microsoft Buildings 16, 17, & 18
Redmond, Washington
Hermanson completed $17,000,000 of mechanical construction services to renovate three occupied interconnected office buildings totaling over 470,000-s.f. without displacing any of the 3,500 workers in the buildings.

  Boeing
Boeing
Puget Sound Region
For over 25 years, Hermanson has worked with Boeing to update their facilities.


  Roosevelt High School
Roosevelt High School
Seattle, Washington
Part of the Seattle School District’s ongoing upgrade of historic schools, the Roosevelt High School renovation resulted in an architectural gem and an educational success.

  John Stanford Center for Educational Excellence
John Stanford Center for Educational Excellence
Seattle, Washington
Hermanson provided full mechanical construction for this retrofit of a postal distribution warehouse into a modern, centralized educational service center.

  Gray Triangle

"This was a tough project.  Compared with other contractors, Hermanson Company was head and shoulders above the rest!"

Dick Dunham, University of Washington