Trades and Services > Plumbers
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.
Details
- Last Updated
- 01/Feb/2026
- Contact
- Naveed Mian
- [email protected]
- Phone
- (425) 391-8585
- Website
- http://www.ccseattle.com/contact-seattle-underground-utilities
- Address
- 25910 SE Old Black Nugget RdIssaquah, WA 98029