To the meet budgets and schedules of tunnel and underground projects, it is critical to understand cost and schedule drivers. Schnabel’s constructability, estimating, and scheduling (CES) team “thinks like a contractor” to bring clients crucial insights through­out the design process, ensuring that projects are both biddable and buildable.

Our team provides comprehensive CES services for underground projects for all types of procurement methods (DBB, DB, PDB, CMAR) and during all project phases, from early conceptual planning and feasibility, through design progression, procurement, and construction. This team is comprised of former contractors who have specialized in managing and estimating underground construction projects of all complexities, scopes, and sizes; and constructed by all methods including shield tunneling, mechanized tunnel boring machine, conventional drill and blast, SEM/NATM, trenchless, and open cut.

The CES team is uniquely qualified to:

  • Perform constructability reviews
  • Generate bottom-up detailed engineer’s estimates
  • Produce independent construction cost estimates and check estimates
  • Develop detailed critical path schedules
  • Support change order and claims management

Combined with our core engineering disciplines, and our program management, planning, and construction management expertise, the CES team’s capabilities are powerful assets that support the development and execution of any underground project. Our clients can be confident that their project estimate and schedule reflect market conditions and are both realistic and constructable.


  • Constructability reviews
  • Contract document assessment
  • Review of Engineer’s estimate and schedule
  • Analysis of commercial terms including payment provisions and risk allocation

Cost estimating

  • Rough order of magnitude estimates for initial project evaluation
  • Quantity take-off review/comparisons
  • Detailed cost estimates (at various design phases)
  • Support for cost impacts during quantitative risk analysis
  • Value engineering cost estimates
  • Independent cost estimates (ICE)
  • Review of alternative technical concepts (costs and schedule impacts)
  • Support for capital improvement budgets

Project scheduling

  • Detailed construction schedules
  • Evaluation of schedule logic for critical path
  • Evaluation of impacts to constraint durations
  • Milestone reasonableness checks
  • Delay and recovery schedule analysis

Construction phase support

  • Submittal reviews
  • Change order and claims support

Key Contacts

James Foley

Principal / Tunnels and Underground

William Monville

Senior Estimator / Tunnels and Underground

Gregory G. Smith

Associate / Tunnels and Underground

J. Scott Brake, EIT

Project Engineer / Tunnels and Underground

Gregory M. Hauser

Senior Consultant / Tunnels and Underground