(425) 391-8585

Cornerstone Construction of Seattle excavates and installs underground utilities throughout the Seattle area. Our capabilities include demolition, site excavation, trenching and pipe lining for homeowners, developers, industrial facilities and municipalities. Contact us to learn more »

Side Sewer Contractor

Cornerstone Construction has been excavating and installing underground utilities in Seattle since 1986. We can handle all your dirt work from demo to excavation, underground utilities and pipe lining.

We Fix Broken Pipes

If the pipes between your house and the street are clogged or broken we have the tools to take care of all your problems.