Mayes Testing Engineers, Inc., A Terracon Company

Mayes Testing Engineers was founded in 1984 and has offices in Lynnwood, Tacoma and Portland with a combined local staff of over 130 employees. In August 2016, Mayes joined Terracon which not only brings additional local staff to our team but provides resources of a national company with over 4500 employees. Quality service and client satisfaction have helped Mayes Testing Engineers become one of the largest and best-known providers of construction quality assurance services in the Pacific Northwest. With the largest staff of certified inspectors in Washington state, our firm has worked on many high profile, complex construction projects. Our clients include Microsoft, Boeing, University of Washington, Amazon, Providence Health System, Port of Seattle, and many private and public agencies.