(425) 391-8585

"Part of our mission at Rafn is to develop strong partnerships that help us provide customer satisfaction while still keeping our costs low. Cornerstone saves money for our customers and gets the job done on time – every time.”

– Heather Beaulieu
Vice - President, Rafn Company

Developer Services Seattle



Cornerstone is a full service underground sewer pipe line utilities contractor. We have the experience and equipment to deliver complete utilities and excavation services on just about any project in Seattle. From Utility design and Civil Engineering to demolition and excavation, new utilities, pipe lining, new main installation, fire service, electrical and gas conduit; we do all of that.

Seattle Pipe Line Repair