Trenchless Consultants | Trenchless.Directory | WA

Staheli Trenchless Consultants is a specialty engineering firm focusing on the reduction of trenchless risk through trenchless engineering services, including feasibility studies, geotechnical investigation planning, design and bid services, as well as specialty construction management and inspection services.

Headquartered in Lynnwood, Washington, the firm specializes in underground construction risk management across various trenchless technologies, including tunnel boring, microtunneling, horizontal directional drilling, auger bore pipe jacking, pipe bursting, sliplining, open-shield pipe jacking, and pipe ramming.

STC provides services ranging from feasibility analysis to complete design, bidding, inspection, value engineering, and expert witness testimony.

Staheli Trenchless Consultants is certified as a Women’s Business Enterprise (WBE) in both Washington and Oregon. STC is registered with King County, WA, as a Small Contractors and Suppliers (SCS) certified business.

STC also provides specialty construction management services, both pre-bid and post-construction. Pre-bidding services include developing and evaluating pre-qualification packages, as well as conducting quality assurance for bidding contractors (i.e., ensuring they have an appropriate level of experience to match the complexity of the project).