Mechanical Construction, Engineering & Service


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

Seattle, Washington

Construction was completed on time for this major renovation replacing plumbing and HVAC systems throughout the historic structure. Renovations took place in phases while the structure was occupied and functional,... Read More »

William Kenzo Nakamura Federal Courthouse

Seattle, Washington

The Nakamura U.S. Courthouse was the west's first Federal building designed specifically for U.S. courts. The neo-gothic structure, originally opened in 1940, was listed on the National Register of Historic... Read More »

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. Hermanson provided complete mechanical systems... Read More »

Edmonds Center for the Arts

Edmonds, Washington

This publicly bid project resulted in the transformation of a 1939 New Deal building into a 750-seat performing arts theater and concert hall with community meeting rooms and a full-sized... Read More »

Cheney Stadium Renovation

Tacoma, Washington

Working closely with the General Contractor and the Architectural Design team, Hermanson completed mechanical and plumbing systems design and construction for the complete renovation of the Cheney Stadium, the home... Read More »