Business Details
40 Years
experience
Expert Earthwork & Utility Construction Services
Since 1986, Cornerstone Construction of Seattle has established itself as a leading provider of earthwork and underground utility construction services in the Greater Puget Sound region. Our decades-long relationships with local general contractors, builders, and city authorities reflect our commitment to integrity, precision, and client success. We specialize in excavation, demolition, sewer and storm system installation, underground power and gas infrastructure, and advanced solutions like CIPP lining. Our teams expertise in navigating bureaucratic requirements and coordinating subcontractors ensures seamless project execution. With a reputation built on 30+ years of reliable service, we prioritize clear communication, proactive problem-solving, and cost-effective strategies tailored to each projects unique demands.Our U-certified professionals deliver meticulous attention to detail, from small-scale homeowner needs to large commercial developments. By focusing on quality and efficiency, we guarantee timely, efficient work that meets and exceeds client expectations. Our partnerships with industry leaders like RAFN, Hammer and Hand, and Teak Construction underscore our trusted position in the construction sector. We remain dedicated to maintaining our legacy of excellence while adapting to modern challenges in underground utility and excavation projects.
Services
Earthwork & Excavation
Demolition Services
Underground Utility Installation
Sewer & Storm Repair
CIPP Lining
Video Inspection
Details
- Year established: 1986
Highlights and features
- We offer 30+ years of specialized experience in underground utility construction.
- Our team excels at proactive problem-solving to avoid costly project delays.
- We provide full-service utility installation from planning to execution.
- Our U-certified professionals ensure compliant fire water line installations.
- We maintain long-standing partnerships with top regional builders and developers.
Associations and certifications
- U-certified
What people say
30+ years of experience
Proactive problem-solving
Expert utility installation
Services
Earthwork & Excavation
Our excavation services prepare construction sites by clearing land, demolishing structures, and shaping terrain for foundations. We handle projects from small residential lots to large commercial developments. Our precision ensures proper grading and support for subsequent construction phases.
Underground Utility Installation
We install complete sewer, stormwater, water, gas, and power conduit systems. Our expertise includes main line extensions, manholes, catch basins, and CIPP lining. We coordinate with utility providers to ensure code compliance and long-term functionality.
Sewer & Storm Repair
We diagnose and fix sewer and storm line issues using video inspections, hydro jetting, and CIPP lining. Our solutions range from minor repairs to full system replacements. We prioritize cost-effective methods that minimize disruption and extend infrastructure lifespan.
Demolition Services
We provide controlled demolition of homes and small buildings to prepare sites for new construction. Our team safely removes debris and prepares lots for excavation. We adhere to environmental regulations during all demolition processes.
CIPP Lining
Our trenchless CIPP lining technology repairs damaged sewer and storm lines without excavation. This method preserves landscapes while creating durable, leak-proof pipelines. We install linings that harden in place for long-lasting solutions.
Questions
What services do you offer to homeowners?
We provide sewer and storm line diagnostics, video inspections, hydro jetting, CIPP lining, repairs, and full excavations for residential properties.
What is a CIPP liner?
A trenchless repair method where a resin-impregnated tube is inserted and hardened inside existing pipes, offering a durable, cost-effective alternative to excavation.
Do you provide emergency services?
We do not offer 24/7 emergency services but provide honest post-crisis evaluations and repairs for sewer or drainage issues.
Are you certified for fire system water lines?
Yes, we are U-certified to install fire water services from the connection point to building systems, with extensive installation experience.
How are you different from competitors?
Our proactive issue identification, transparent billing, and detailed estimates minimize change orders. We prioritize clear communication and precision execution.
