Mechanical Construction

Since 1979, Hermanson Company has been a regional leader in Mechanical Systems Construction – HVAC Sheet Metal, Pipe-Fitting & Plumbing – design, fabrication & installation for projects ranging from large, complex new & renovation construction to quick-hit retrofits and tenant improvements. Learn More

Design-Build Engineering

Hermanson’s experienced design engineers collaborate with skilled construction professionals to provide efficient, cost-effective, and high-quality mechanical & plumbing systems through an integrated, streamlined process. Learn More

Service & Maintenance

All mechanical equipment will require service at some time during its operating life. Hermanson Service provides quality maintenance, equipment retrofit and emergency services for building mechanical systems – 24/7, 365-days a year. Learn More

Lean Fabrication

Standardization of systems components, off-site prefabrication and simplicity of installation are key components of Lean Construction practices. Hermanson’s fabrication facilities – designed and operated to incorporate Lean practices – fabrications and assembles ductwork, piping and plumbing assemblies to drive Lean Construction. Learn More

Featured Projects

Sound Transit Operations and Maintenance Facility East (OMFE)
Bellevue, Washington Learn More

Seatac Airport North Satellite Expansion Renovation
SeaTac, Washington Learn More

Salish Lodge Remodel
Snoqualmie, Washington Learn More

Google Lakefront Blocks
Seattle, WA Learn More

UO Knight Campus for Accelerating Scientific Impact
Eugene, OR Learn More

Asante Rogue Regional Medical Center
Medford, Oregon Learn More


"We wish to extend our appreciation to Hermanson Company for participating with the Boeing - 767 Relocation project and your Company's contributions to its successes.  The list of challenges to the team was lengthy and with your assistance and perserverance, each was resolved safely, timely, and on budget."

- Ken Graves

"In the workplace, our company has been able to count on you to be an integral part of our projects and play an essential role in their completion.  We are delighted that you made the decision to be our partner in supporting our community as well."

- Bob Babitsky

"I am delighted to report to you that our team thought your company the 'Best Subcontractor' on the project.  Your personnel did a great job of supporting the successful completion of the project.  All of us here really appreciate working with such great people."

- Kim Bottles

"The company you can always count on, always follows through, and always has a unique solution for the problems at hand. I enjoy working with Hermanson and look forward to many labs in our future. You have an exceptional team!"

- Melinda DeWalt

"The hard work of both your field and management staff was a big contributor to the success of this important project."

- Stephanie Hixson