It has taken over 18.5 million worker hours; completed by more than 17,000 workers to bring NorthConnex to life.

From the first shovel in the ground to witnessing our final tunnel breakthrough, lets take a look back at some of our biggest achievements and the legacy our construction process leaves behind.

How we built it

Ever wanted to know how to build a road tunnel? Find out how by watching our two videos below for a 101 in NorthConnex construction.

The animation will provide you with a step-by-step guide on how the tunnels were built, starting with the tunnel excavation phase and continuing right through until the mechanical electrical installation, covering topics such as paving and spray-concrete lining.

If an animation isn’t your thing, hear from our tunnelling Construction Director while watching the tunnel excavation process happen first hand.

Construction by the numbers

87,000 hours

of training delivered through the NorthConnex Training Hub

Leading ISCA design rating

NorthConnex is the first road project to achieve a 'Leading' ISCA design rating


over 50,000 community interactions 


spent with indigenous business

Over one hectare

of native vegetation saved due to design decisions


more than 2,000 kids through the Tiny Tunellers program


NorthConnex will not only change the communities along Pennant Hills Road by unlocking congestion, we are also leaving behind a lasting legacy for generations to come by promoting Science, Technology, Engineering and Maths (STEM) subjects in schools and thinking outside the box.

Tiny Tunnellers was a NorthConnex funded program designed to improve the uptake of STEM subjects in schools. It was offered to preschool and primary school children along the NorthConnex tunnel alignment and was designed to provide a foundation for careers including engineering, tunnelling and construction. 

Over one million cubic metres of NorthConnex spoil was delivered to lay the foundation for the Hornsby Quarry rejuvenation project. The new Hornsby Quarry will be transformed from an old abandoned quarry into new public parkland for the entire community to enjoy.