M4-M5 Link Tunnel

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M4-M5 Link Tunnel

(Haberfield to St Peters)

Tunnels connecting the New M4 at Haberfield and the New M5 at St Peters

The M4-M5 Link is being delivered in two stages:

  • Stage one - construction of the M4-M5 Link Tunnel between the New M4 at Haberfield and the New M5 at St Peters and stub tunnels to the Rozelle Interchange. This stage is being managed by Sydney Motorway Corporation.
  • Stage two - construction of the Rozelle Interchange and Iron Cove Link. This stage is being managed by Roads and Maritime Services.

The M4-M5 Link is the final and most critical component of WestConnex, featuring twin tunnels between the New M4 at Haberfield and the New M5 at St Peters. Each tunnel will be approximately 7.5 kilometres long and able to accommodate up to four lanes of traffic in each direction. The M4-M5 Link Tunnel will be delivered as a stand-alone project.

The M4-M5 Link will provide an additional 2.5 hectares of green space in St Peters.

Environment and planning 

The M4-M5 Link received NSW planning approval in April 2018.

Project history 

Project stats

Current status: Approved
Construction start: 2018
Open to traffic (pending planning approval): Early 2023^

* Based on WestConnex Road Traffic Model V2.1, WestConnex Updated Strategic Business Case, November 2015
^ WestConnex Updated Strategic Business Case, November 2015
^^ Between Haberfield and Rozelle

Industry partners

    Design and construct contract: Lendlease Samsung Bouygues Joint Venture 
    Operations and maintenance contract: Commitment deed in place with Fulton Hogan and Egis Joint Venture
    Tolling contracts: TBA

What's happening now

Local updates

To learn about work in an area or for a project, you can access a range of documents including work notifications, management plans, compliance tracking reports, maps and permits.

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FAQs See all

Sydney Motorway Corporation (SMC) is committed to supporting western Sydney communities through key community partnerships and programs that provide long term benefits to those who need it most.

SMC’s community partnerships with the GWS Giants and Wests Tigers will ensure positive and lasting outcomes for thousands of people based in western Sydney through the delivery of targeted community programs.  

These programs deliver positive outcomes in health, education and skills, and harmony outcomes.

The community partnerships are one part of SMC’s Community Connections Program, which also includes the SMC Community Grant Scheme.

Two-thirds of WestConnex is being built in underground tunnel, minimising impacts on the surface. We plan to use the disused Rozelle Rail Yards for the proposed Rozelle Interchange to limit the number of properties needed for construction of the M4–M5 Link. 
It is expected a small number of properties near Victoria Road and Iron Cove Bridge and some commercial properties near the Rozelle Rail Yards will need to be acquired for the project. 
Roads and Maritime Services has been in contact with all affected property owners in this location.  


Only once a year. Unlike the majority of New South Wales motorways which increase quarterly, WestConnex tolls increase annually on 1 January.  There will be a maximum increase per annum of four per cent or the consumer price index (CPI) – whichever is greater – until 2040. After that, CPI will apply.

Read more about WestConnex tolls.