West Gate Tunnel

The West Gate Tunnel project delivered a vital alternative to the West Gate Bridge, provide quicker and safer journeys, and remove thousands of trucks from residential streets.

Our team focused on ensuring opportunities for local workers and businesses, providing a strategic and socially inclusive procurement program, and value for money urban designs that deliver enhanced benefits to communities and stakeholders.

The West Gate Tunnel Project addressed a number of critical challenges in relation to traffic, growth and liveability across Melbourne.

CPB Contractors delivered this project in a 50:50 joint venture with John Holland.

Widening the West Gate Freeway from eight lanes to 12 between the M80 Ring Road and Williamstown Road. A 2.8km eastbound tunnel and 4km westbound tunnel under Yarraville. A new bridge over the Maribyrnong River providing an alternative to the West Gate Bridge; and An elevated road along Footscray Road to the Port of Melbourne, CityLink and the city’s north, and major new cycling and pedestrian paths.

Construction commenced in 2018 with the project officially opened in late 2025.

CPB Contractors acknowledged the Bunurong and Wurundjeri people of the Kulin Nation as the traditional and continuing custodians of the lands on which the West Gate Tunnel project was delivered.

Latest news and updates View more here 17 August 2026 Piling commences on new Bundaberg Hospital project Piling works have officially commenced on the new Bundaberg Hospital, marking a significant milestone in the delivery of one of Queensland's largest health infrastructure projects. 13 August 2026 Engineering innovation delivering better environmental outcomes in Tasmania At the Ti Tree Bend Sewage Treatment Plant in Launceston, innovation isn’t just about building new sewerage infrastructure - it’s about rethinking how it’s designed, delivered and integrated to achieve better outcomes for Tasmanian communities and environment. 12 August 2026 CPB Contractors welcomes future industry leaders to Cross River Rail CPB Contractors, in partnership with Transport Australia, welcomed more than 50 engineers at the association’s Emerging Leaders Forum in Brisbane last week, providing the next generation of infrastructure professionals with a unique opportunity to hear firsthand about the delivery of Cross River Rail and the lasting legacy it will leave for Queensland. 11 August 2026 Collaboration Delivers Smarter Solutions for Complex Foundation Challenges CPB Contractors Engineering Manager Gerard Quigg and Project Manager Dobu Unugueanu recently presented a technical paper at the 2026 joint conference of the Deep Foundation Institute (DFI) and the piling Foundation Specialists Federation (PFSF) in Sydney, showcasing how collaboration across the CIMIC Group can help solve complex engineering challenges. 09 August 2026 Completion of Western Sydney International Airport's Stage 1 Cargo Works Practical completion has been achieved on Stage 1 Cargo Works at Western Sydney International (Nancy-Bird Walton) Airport (WSI), marking a significant milestone in the delivery of Sydney’s new 24-hour global gateway. 04 August 2026 Building futures through CareerTrackers Remy Ryalls journey CPB Contractors' partnership with CareerTrackers is building capability, confidence and long-term careers for Aboriginal and Torres Strait Islander students. As we celebrate NAIDOC Week and this year's theme, '50 Years of Deadly', we're recognising the next generation of Indigenous professionals helping shape Australia's future. Undergraduate Engineer Remy Ryall is one of those future leaders. 26 July 2026 Powering the Future: Electrification Driving Sustainability on Suburban Rail Loop East Our Suburban Connect team is advancing sustainable construction practices across the Suburban Rail Loop East project through a growing suite of electrification and renewable energy initiatives. 23 July 2026 Powering the Future: Electrification Driving Sustainability on Suburban Rail Loop East Our Suburban Connect team is advancing sustainable construction practices across the Suburban Rail Loop East project through a growing suite of electrification and renewable energy initiatives. 21 July 2026 CIMIC's UGL and CPB Contractors to build Neoen's Narrogin Wind Farm with Envision Energy UGL and CPB Contractors have been selected by Neoen and Envision to construct Neoen’s 179 MW Narrogin Wind Farm in Western Australia, a project that supports the state’s energy transition and growing demand for reliable, lower-emissions power. 17 July 2026 Milestone moment for new Dunedin Hospital Vertical construction is now underway on the New Dunedin Hospital | Project Whakatuputupu Inpatient Building, with the first structural steel installed on Wednesday, marking the start of the inpatient building rising above ground. Next