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Yonge North Subway Extension – Advance Tunnel Project

Project Type:
Design Build Finance (DBF)
Infrastructure Type:
Contract Value:
To be announced at Financial Close

About the Project

The Yonge North Subway Extension (YNSE) will extend the TTC’s Line 1 subway service approximately 8 kilometres from the existing terminus at Finch Station into the City of Richmond Hill. The project runs through the City of Toronto and York Region, including sections within the cities of Markham, Vaughan and Richmond Hill. It will include an approximately 6.3-kilometre tunnelled segment as well as an above-ground segment that will run along the existing rail corridor in the northern section of the route. Once complete, the YNSE will connect with local and GO transit services. 

The Yonge North Subway Extension is one of the priority transit projects announced by the Province for the Greater Toronto and Hamilton Area, including the Ontario Line, the Scarborough Subway Extension, the Eglinton Crosstown West Extension and the Hamilton LRT.

The Yonge North Subway Extension is to be delivered in separate procurement contracts:

  1. The advance tunnel between Finch Station and Richmond Hill.
  2. A separate contract to construct the Stations, Rail and Systems.


  • Request for Qualifications
    Apr 27, 2023
  • Short-list Bidders Selected
    Dec 01, 2023
  • Request for Proposals
    Dec 01, 2023
  • Winning Bidder Selected
  • Construction Begins
  • Construction Ends

Latest News


The scope of work includes:

  • Approximately 6.3 kilometres of tunnelling for the 8-kilometre extension.
  • Design and construction of launch and extraction shafts, tunnels, as well as headwalls for emergency exit buildings and stations.
  • Supply tunnel boring machines (TBMs) and install precast concrete tunnel liners.
  • Activities necessary to build the tunnel (e.g. utility relocations, 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 Yonge North Subway Extension (YNSE) Advance Tunnel 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.