Cornerstone Construction of Seattle has provided expert earthwork, excavation, and underground utility services since 1986. Our team specializes in sewer, storm, water, and gas infrastructure, demolition, and CIPP lining, serving homeowners, developers, and general contractors. With a focus on precision, reliability, and client collaboration, we ensure seamless project execution for both small and large-scale developments.
Earthwork & Excavation
Demolition Services
Underground Utility Installation
30+ years of experience
Proactive problem-solving
Expert utility installation
