Mechanical Construction, Engineering & Service

Company History

  • Jerry Hermanson

    Our Founding Father

    Jerry Hermanson started in the Sheet Metal industry in 1955 as an apprentice at Lent's Sheet Metal in Bremerton.  Like his father, he learned the trade working in the Naval shipyards.  Immediately upon completion of his apprenticeship, Jerry was promoted to Foreman and sent to Alaska to work on the Aleutian Radar Station. After this trial by fire, Jerry was hired by MacDonald Miller in Seattle to build their sheet metal division.  Here, Jerry developed many of the relationships that would support him throughout his career, as well as helping develop leadership that would carry the company to greater success.  When, in 1972, Jerry was ready for a new challenge, he moved to Allied Sheet Metal where he managed the sheet metal contract for the Bank of California Tower in Seattle, and soon found himself back in Alaska, managing the installation of heating systems for all of the pump stations along the Trans-Alaska Pipeline. 

    Then in 1979 the greatest challenge beckoned to Jerry - starting his own business.  This is when Hermanson Company was born.  Now, 33 years later, we are proud to celebrate Jerry's vision, determination, and success.

  • 1979

    Hermanson Corporation

    Jerry Hermanson starts Hermanson Corporation, immediately serving the area’s largest contractors and owners with high quality HVAC-Sheet Metal Construction.

  • 1982

    Columbia Tower

    Hermanson is awarded the Sheet Metal contract for the Columbia Tower – still the tallest skyscraper in the Seattle skyline, as well as the tallest building in the Pacific Northwest.  Developed by Martin Selig and constructed by Howard S. Wright Construction, 76-story tower was built over a two-year period.

  • 1984

    Washington State Convention Center

    Hermanson was awarded Sheet Metal contract for the Washington State Convention Center in downtown Seattle, working with Passion Construction of Chicago.

  • 1986

    nullSeahawks Headquarters and Training Facility

    Jerry was able to combine his love of football and the Seattle Seahawks with business when Hermanson constructed HVAC systems for the new Seahawks Headquarters and Training Facility in Kirkland.

  • 1987

    nullGateway Tower, Boeing Field’s Museum of Flight, & the Metropolitan Office Tower

    Hermanson continued its success working on iconic Seattle buildings with the construction of the Gateway Tower (now the Seattle Municipal Building), Boeing Field’s Museum of Flight and the Metropolitan Office Tower.

  • 1989

    Seattle Children’s Hospital

    Work began on our first project for Seattle Children’s Hospital, a relationship that has encompassed over 70 projects and 23 years, and signaled the start of Hermanson’s focus on mechanical construction for healthcare facilities. 

  • 1992

    Boeing 40-37 Wing-Seal-Paint Hangar

    A period of growth began with the award of the Boeing 40-37 Wing-Seal-Paint Hangar project in Everett.  This fast-tracked, $13 million HVAC construction effort was completed in 10 months and used elements of what we today call Integrated Project Delivery (IPD).  This project was quickly followed by several more, extremely fast-tracked efforts for Boeing.

  • 1995

    Microsoft Campus

    We took what was learned with our IPD approach on the Boeing work and applied it to major renovation efforts on Microsoft’s campus in Redmond.  The complete replacement of mechanical systems for Buildings One, Two, & Three (300,000 s.f.) was completed in 70 days – from design through construction.  Renovation of Buildings Four, Five & Six (200,000 s.f.) also included the installation of high density computer labs and a cafeteria.

  • 1997


    Hermanson’s work at MASCA – a computer chip manufacturing plant in Puyallup, Washington – included leading the completion of fully-coordinated MEP documents for this massive clean-room project for all systems, including process piping, carbon steel piping, steel framing, electrical, and HVAC system. 

  • 1998

    Expeditor’s International Building

    Hermanson’s first major Design-Build project – the Expeditor’s International Building in downtown Seattle, was completed.  Our Engineering team provided HVAC and Plumbing systems design and our crews completed the installation for the complete gut and remodel of the 1931 Seattle City Light building and the addition of 97,000 s.f.  in four floors.

  • 2000

    Hermanson Transition

    Jerry Hermanson decided that he was ready to spend more time fishing and began the transition of Hermanson Corporation to Hermanson Company, selling the company to a group of partners led by his son, Rick Hermanson.

  • 2001

    King County Courthouse Seismic Renovation

    Hermanson completed the transition to a full service mechanical contractor with the purchase of Primm Mechanical, bringing Plumbing and Pipefitting capabilities to fit with our outstanding HVAC-Sheet Metal team.  The company was quickly awarded our first, major full-mechanical project completed by our in-house crews – the King County Courthouse Seismic Renovation.

  • 2003

    Hermanson Service & Maintenance Division

    Our offerings to clients expanded with the development of Hermanson’s Service & Maintenance Division.  Providing our customers with 24/7 access to the best Mechanical technicians in the business, Hermanson began repair and maintenance of mechanical systems for both existing and new clients.

  • 2005

    Evergreen Hospital, Roosevelt High School Historic Renovation, & Skyline Retirement Tower

    As our reputation and capabilities grew, Hermanson continued work on a wide range of full mechanical projects with our in-house crews, including the Evergreen Hospital Emergency, Surgery & Inpatient Tower, the Roosevelt High School Historic Renovation, and the Skyline Retirement Tower.

  • 2009

    Partnership Expansion

    The partnership group leading Hermanson Company expanded to include all members of our current ownership team.

  • 2010

    Certified ESCO

    Hermanson is certified as a State of Washington qualified Energy Services Company (ESCO) providing Energy Audit, Analysis, Funding-Assistance, and Upgrades for public and private clients.

  • 2011

    Providence-Everett Cymbaluk Medical Tower

    Hermanson’s teams complete the largest project in our history – the $65 million (mechanical) Providence-Everett Cymbaluk Medical Tower.