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


"You have a group of first class, professional people working for you.  I know we have a quality system in our facility, and we picked the right contractor to do the work."

- Joe Tessier

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

- Andre Belerjean

"This was a complicated project over a very short timeframe. The project was completed without a hitch and it would not have been possible without Hermanson Company’s efforts!"

- Dale Brewer, Supervisor of Maintenance

"Hermanson's involvement from the pre-construction of the project to the commission allowed us to build a terrific end product for the client."

- Bill Kent

"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