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Highway 427 Expansion


Regular renewal of public roadways is critical for the safe movement of people and goods. The expansion of Highway 427, a vital artery in the GTA, better connected the growing economic centres of York Region, Vaughan, and the CPR Vaughan Intermodal Facility. 

Brennan Infrastructures Inc., a member of The Miller Group, and a key developer on the LINK 427 team, achieved Substantial Completion of the expansion project in September 2021

Hitting the milestone was a testament to the top-tier technical resources, highly skilled and experienced workforce, state of the art equipment and cooperation across all Miller divisions. These elements were critical as the work was challenged by pandemic restrictions, and the introduction of new technical standards related to asphalt by the Government of Ontario in December 2020



Ministry of Transportation & Infrastructure Ontario




Road Building

Year Completed



$616 million
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Project highlights

  • Approximately 1,000 jobs were created and sustained through 2018 – 2021.
  • The extension has two interchanges near the Vaughan Intermodal Facility to accommodate Long Combination Vehicles, making it easier for trucks to manœuvre and support the efficient movement of goods across the province and beyond.
  • To protect species at risk impacted by the project’s construction, the ministry completed a 3.20-hectare woodland restoration of a former agricultural field on the east side of the highway, just north of Rutherford Road, and installed 20 habitat structures for four species of bats (Little Brown Myotis, Northern Myotis, Eastern Small-footed Myotis and Tri-coloured Bat).
  • The Ministry of Transportation worked together with Infrastructure Ontario to deliver the Highway 427 expansion project using their public-private partnership (P3) delivery model.
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Project features included:

A new 6.6‑kilometer extension from Highway 7 to Major Mackenzie Drive

  • Eight lanes from Highway 7 to Rutherford Road

  • Six lanes from Rutherford Road to Major Mackenzie Drive, and

  • Three interchanges: Langstaff Road, Rutherford Road and Major Mackenzie Drive

  • New managed lanes

A 4‑kilometer road widening from Finch Avenue to Highway 7

  • From six to eight lanes, Finch Avenue to south of Steeles Avenue

  • From four to eight lanes, from south of Steeles Avenue to Highway 7

  • New managed lanes

The Link 427 team was awarded the approximately $616M contract following an open, fair, and competitive process overseen by a third-party fairness advisor. The Highway 427 expansion supports local and regional growth planning strategies and is part of the province’s transportation objectives for the 2006 Growth Plan of the Greater Golden Horseshoe.

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