Stirrett Johnsen
Mechanical Contractors
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Industry Knowledge, Depth of Experience,
and Unmatched Craftsmanship

Core Competencies

Our world class mechanics are second-to-none when it comes to installing and maintaining:
Domestic Plumbing, Mechanical Piping, Medical Gas, Lab and Specialty Gas, Steam, High Pressure Air, Dairy and Industrial, and Water Features.

In-House Support

Virtual Design and Modeling

We understand the critical nature of technology in the delivery of highly effective and well coordinated systems.  Our experienced VDC professionals, many with field experience, are equipped with software and training to collaborate seamlessly with the most advanced project design teams in the industry. Our primary tools include: Revit with SysQue, AutoCAD, Navisworks, and Bluebeam.

Mechanical Engineering

Our in-house licensed mechanical engineers are experienced in design-build and design-assist projects. The engineering team supports projects through all phases of construction; from conception to pre-construction, design, fabrication, and commissioning. At Stirrett Johnsen our engineers aren’t hidden behind layers of bureaucracy but put on the front line providing creative results-based solutions with a hands on approach to project design.

Prefabrication and Spooling

Through innovation and the latest industry tools our team delivers accurate and coordinated VDC documents to support the spooling, prefabrication, and installation effort. It's not uncommon for Stirrett Johnsen's prefabrication efforts to account for over 40% of a job's total labor. This results in fabricated assemblies accurate to the fraction of an inch; providing a perfect fit in the field and a reduced job-site footprint.



(Infection Control Risk Assessment) is a comprehensive approach to the protection of patients and health facility occupants from infectious disease.  This is a vital aspect and moral responsibility for construction in occupied healthcare facilities.  As an ICRA certified healthcare specialist, we bring the knowledge and experience to protect vulnerable patients from infectious disease.


Early understanding of the social and sustainability objectives of each project is important to optimize design around project goals. We take pride in bringing appropriate and sensible design options to our projects. Stirrett Johnsen has assisted project teams to successful LEED certification on over 50 projects. We have the passion and experience to find the most effective solutions for your building.

LEAN Certified

Lean involves never ending efforts to reduce waste at all levels of our organization. It’s about flow, efficiency, quality and so much more. Our lean culture elevates the levels of success of each Stirrett Johnsen project.

    LEGIONELLA Prevention

    While Legionnaire’s Disease has resurfaced in today’s headlines, Stirrett Johnsen continues to stay on the forefront of Legionella Prevention implementing a combination of modern methods and time tested techniques.


    Backed up by state approved QA/QC programs, Stirrett Johnsen produces welds using customized in-house weld procedures and industry-leading welders approved by third party certified welding inspectors.

    Explore Our Featured Projects

    PremierE On Pine

    This 40-story, design build, 386 unit apartment building includes 5 stories of underground parking, 4 stories of above ground parking and one floor of retail space. 

    Vulcan Block 34, Amazon Headquarters

    Block 34 consists of 2 steel-framed buildings with a 5 story glass connector. The total footage includes 550,000 square feet of Class A office space and street level retail, extensive rain-fed water features, plus 213,800 square feet of parking.  

    St. Anthony Hospital

    St. Anthony Hospital is a state of the art, 256,000 square foot 80 bed hospital in Gig Harbor, Washington, owned and operated by Franciscan Health System.  

    Get in touch

    We at Stirrett Johnsen know choosing a contractor is a choice not to be taken lightly. That’s why we offer free consultations to walk you through your needs, the scope of your goals, and your budget.