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

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

Asante Rogue Regional Medical Center
Medford, Oregon Learn More

Battery Active Materials Factory (BAM-2)
Moses Lake, Washington Learn More

Climate Pledge Arena
Seattle, Washington Learn More

University of Washington Hans Rosling Center for Population Health
Seattle, Washington Learn More


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

- Stephanie Hixson

"Again we were able to rely on your company to meet our needs and those of our customers. Once again, the work was performed in a timely and professional manner. And I hope we have an opportunity to work together again."

- Pat O'Neill

"Your entire team was so easy to work with.  There were no problems - just solutions!"

- Andre Belerjean

"At the start of this job, I dreaded the potential of this interface of existing and new systems coming on line, but your team has truly eased my concern… On top of the coordination, the overall installation has been excellent and the work laid out in such a manner that when Hermanson is all done, it will look as if it was the original installation and not a third renovation."

- Keith Geary, Director of Engineering

"The Hermanson team has done a fantastic job supporting the construction process, maintaining challenging schedules and achieving project goals. HST office and field teams really appreciate Hermanson’s communication and follow up, and proactive approach to finding solutions."

- Dave Trulson, Principal