(425) 391-8585

"Cornerstone is the best underground utilities contractor in town. I use them on all of my projects because I work on a lot of environmentally critical areas. I trust Cornerstone to deliver on my toughest jobs."

– Jon Riser

Utilities Excavation

Cornerstone has been digging up Seattle for over 25 years. We excavate sites ranging from apartment buildings with underground parking to steep slope sites with multi-tiered pads and underground utilities. We know there is more to excavating than digging a hole. We work hand in hand with other contractors to help the whole process run smooth.

Underground Utilities Excavation

Seattle Underground Utilities Excavation