Civil Engineering Services in Washington State

COY Engineering Services LLC extends its civil engineering expertise to clients across Washington State. We know that Washington's permitting process comes with its own set of requirements — including State Environmental Policy Act (SEPA) review, Washington State Department of Ecology stormwater permitting, and WSDOT coordination — and we manage that complexity so you don't have to.

Whether you're developing a commercial property, planning residential land improvements, or need stamped civil drawings that hold up to Washington's code requirements, our team delivers accurate, code-compliant work on schedule.