CIMIC Group company CPB Contractors, in a joint venture with John Holland, has been selected by the NSW Government to deliver the Western Harbour Tunnel - Southern Tunnelling Works as a modification to the Rozelle Interchange contract.

The design and construct contract will generate revenue of approximately $350 million for CPB Contractors.

The enabling works will facilitate the efficient construction of the Western Harbour Tunnel and its seamless integration into the Sydney motorway network.

The project involves the excavation and lining of the Western Harbour Tunnel driven tunnels, including ventilation tunnels, between the stubs provided by the Rozelle Interchange and Birchgrove Oval.

Work will start in 2022 and is expected to be completed in 2025.