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Scarborough Subway Extension – Advance Tunnel Project

Project Type:
Design Build Finance (DBF)
Infrastructure Type:
Contract Value:
$757.1 million

About the Project

The Scarborough Subway Extension (SSE) Advance Tunnel Project is the first phase of work for the 7.8 kilometre extension of TTC's Line 2 (Bloor-Danforth), from Kennedy Station to McCowan Road/Sheppard Avenue.

Starting with the tunnelling phase of work allows a significant portion of the subway extension to move forward on an accelerated timeline.

A separate contract to deliver the rest of the work includes building the stations, fitting-out the tunnel and installing and commissioning the systems to put the subway in service.


  • Request for Qualifications
    Mar 10, 2020
  • Short-list Bidders Selected
    Aug 05, 2020
  • Request for Proposals
    Aug 20, 2020
  • Winning Bidder Selected
    May 25, 2021
  • Construction Begins
    Jun 01, 2021
  • Construction Ends

Latest News


The scope of work includes:

  • tunnelling works for the 7.8-kilometre subway extension, from Kennedy Station to McCowan road/Sheppard Avenue
  • design and construction of launch and extraction shafts, tunnels, as well as headwalls for emergency exit buildings and stations
  • supplying tunnel boring machines and installing segmental precast concrete tunnel liners
  • activities necessary to build the tunnel (e.g. utility relocations, supports for shaft and headwalls, temporary power supply, lighting, ventilation, and drainage)

Project Benefits

  • Improves access to transit for area residents
  • Reduces daily travel times for commuters
  • Economic and community growth along the future transit line with job creation opportunities
  • Reduction in traffic congestion, greenhouse gases and fuel consumption by providing a new transportation option

Demonstrating Value

  • The project is being delivered using a Design-Build-Finance (DBF) model. Key benefits of a DBF model include significant risk transfer to the private sector over the life of the project agreement, greater cost and schedule certainty and greater potential for design and construction efficiencies and innovation.
  • Based on precedent project experience, a DBF procurement model typically has delivered a value for money savings in the range of 10% to 15% compared to undertaking the same projects using traditional delivery models.

Learn more about IO’s delivery models and the associated features.

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These project documents are being made available on this website for informational purposes only. Neither Infrastructure Ontario nor Metrolinx makes any representation or warranty regarding the accuracy or completeness of the content or form of these documents.

Infrastructure Ontario and Metrolinx, in their sole and absolute discretion, may choose to make available on this website amendments, revisions, modifications or replacements to these documents. These documents remain open for further revision, modification, replacement or cancellation by Infrastructure Ontario and Metrolinx at any time and in no event shall either Infrastructure Ontario or Metrolinx be responsible or liable, directly or indirectly, for any damage or loss caused or alleged to be caused by or in connection with the use of or reliance on the content of these documents.