Structural Design Associates is a professional engineering company providing comprehensive structural engineering services for both residential and commercial projects. Our company believes in providing designs that are functional and economical, working together with our clients to develop complete solutions. Our principal is licensed as a professional engineer in Washington and our company is experienced in the structural engineering of single family residences, multi-family residences, concrete masonry buildings, concrete tilt-up structures, retention vaults, retaining walls, deep foundations, seismic retrofits, and more.
We have been sending projects to SDA for many years and have always had prompt responses  read more...


“We have been sending projects to SDA for many years and have always had prompt responses to all of our questions”.

            ~ Duane Rowett, President of Design Lines


“Chris Covington has been my engineer for the past 11 years. He always gets the job done in a timely fashion. I will continue to use him with confidence.”

            ~ Gordon Reykdal, Gordon Construction


Cobra Construction Company has worked with Structural Design Associates for 15 plus years on various projects.  They take a vested interest in seeing their project design is contractor friendly thus more affordable for the client.  I would recommend them to anyone with a need for a reliable structural engineer who is always thinking out of the box.       

            ~Jon D. Walkley, Cobra Construction Company

"Best price, quality work, on time. How do you beat that?"

                   ~Ted Wheeler, T&E International 


“We have worked with SDA on the same projects for over ten years.  We have found the SDA staff to be very professional, knowledgeable, and responsive to clients’ needs and demanding schedules.  SDA often came up with creative and very economical solutions to complicated engineering issues, within very limited budgets and time frames.”


Khaled M. Shawish, PE


Nelson Geotechnical Associates, Inc.

Thank you!  

 "My experience with SDA has been a pleasant one. SDA is always respectful to our designs their engineers are willing to meet with you to discuss design options and issues. They are very reasonably priced for the amount of detail and turn around time. We have never had a question from the building department when SDA designed our structural"

Van Slyck Associates, Inc.