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Funding Program:Investment Road and Rail Program
Transport Mode:Road
Expected Start/Finish:Early 2015 - Late 2020
Estimated Project Cost:$2,987,000,000
Australian Government Contribution:$412,330,000
Corridor:Sydney Urban

Project Description

This project comprised the construction of dual road tunnels, approximately 9km in length, beneath Pennant Hills Road and the Northern Railway Line linking the M1 and M2 Motorways. Each of the tunnels has been built with a capacity for three lanes.


The benefits of the NorthConnex project include:

  • reduction in traffic congestion on Pennant Hills Road and surrounding traffic network
  • quicker travel times between the M1 and the M2
  • a reduction in operating costs for national freight carriers and long-distance transport operators
  • a reduction in heavy traffic and associated noise in local streets
  • an improvement in local air quality
  • improved safety and productivity on local, intrastate and interstate freight movements
  • increased infrastructure capacity and efficiency
  • improved reliability of travel between the M1 and M2 and the Sydney to Brisbane Corridor


The Australian and NSW governments have each committed $412.3 million towards the NorthConnex project, including the use of Hornsby Quarry for spoil management.

The project was delivered in partnership with the project's private sector sponsors, Transurban and the Westlink M7 Shareholders.


Planning approval was received on 13 January 2015, along with submission and acceptance of the final binding offer as part of the Unsolicited Proposals process.

The NSW Government, Transurban and the Westlink M7 Shareholders reached Contract and Financial Close on 31 January 2015, which included acceptance of the final offer from the preferred tenderer and reaching final agreement on funding. Lend Lease Bouygues Joint Venture was awarded the contract to design and build the project following Contract Close.

Construction started on 5 February 2015. Excavation of all mainline tunnels was completed in November 2018. The project opened to traffic in October 2020.

Photo Gallery

Related Links

NorthConnex project website

NorthConnex - Hornsby Quarry

Disclaimer: The material contained in this site is made available on the understanding that the Department is not thereby engaged in rendering professional advice for a particular purpose. Before relying on the material in any important matter, users should carefully evaluate the accuracy, completeness and relevance of the information for their purposes and should obtain appropriate professional advice relevant to their particular circumstances.

Project details last updated: 2/11/2020