Business Details
40 Years
experience
Expert Excavation & Utility Services in Seattle
Since 1986, Cornerstone Construction of Seattle has established itself as a trusted leader in excavation and underground utility construction across the Greater Puget Sound region. Our decades-long partnerships with local general contractors, builders, and the City of Seattle reflect our unwavering commitment to integrity, precision, and client satisfaction. We specialize in navigating complex bureaucratic requirements, coordinating subcontractors, and proactively addressing project challenges to deliver timely, efficient results.From foundational excavation to comprehensive utility installation, our team combines technical expertise with a collaborative approach to ensure every project meets exacting standards. With a proven track record spanning residential and commercial projects, we guarantee work that not only meets but exceeds expectations, solidifying our reputation as a reliable industry partner.
Services
Demolition
Excavation
Clearing
Underground Power Installation
Sewer Installation
Storm Drain Installation
Water Line Installation
Hydro Jetting
CIPP Lining
Utility Installation
Details
- Year established: 1986
Highlights and features
- 30+ years of experience working with the City of Seattle
- Experts in navigating complex bureaucratic requirements
- Proactive coordination with subcontractors to prevent delays
- Guaranteed precise and timely project execution
- Proven track record with major local builders like RAFN and Compass
Services
Demolition
We provide complete demolition services for single-family homes and small buildings. Our team ensures safe, efficient removal of structures to prepare sites for new construction while adhering to all regulatory requirements.
Excavation
From precise cuts for custom foundations to large-scale earthmoving, our excavation services support lagging crews and prepare sites for vertical construction with accuracy and efficiency.
Sewer Installation
We install comprehensive sewer systems including main lines, catch basins, and side sewers. Our U-certified team ensures code compliance and long-term functionality for residential and commercial projects.
CIPP Lining
Our trenchless CIPP lining solutions repair damaged sewer lines with minimal disruption. This durable, cost-effective method extends pipeline lifespan while maintaining system integrity.
Underground Power
We specialize in installing underground power systems including duct banks, vaults, and conduit networks. Our expertise ensures safe, code-compliant electrical infrastructure for commercial and municipal projects.
Questions
What types of projects do you handle?
We serve residential and commercial clients with excavation, demolition, sewer/storm systems, underground power installations, and trenchless pipe rehabilitation across the Puget Sound region.
Are you licensed for utility work in Seattle?
Yes, we are a U-certified installer with 30+ years of experience meeting Seattle's regulatory requirements for fire lines, water services, and municipal infrastructure projects.
How do you prevent project delays?
Our team proactively coordinates with subcontractors, identifies potential conflicts early, and leverages decades of local experience to maintain project timelines and budgets.
Do you offer emergency repair services?
While we focus on scheduled projects, our hydro jetting and CIPP lining services provide rapid solutions for urgent sewer line issues with minimal property disruption.
What sets you apart from other contractors?
Our combination of municipal expertise, long-term partnerships with top builders, and commitment to precision execution ensures reliable results for complex underground construction challenges.
