BudgetGuessr rankings

The most expensive megaprojects from Australia in our catalogue

The 30 most expensive of 59 built and under-construction megaprojects in Australia in the BudgetGuessr catalogue, ranked by documented cost in US dollars.

Ranking

  1. 1View of Western Australia taken during ISS Expedition 26.

    Gorgon LNG development, first phase

    2016 · Energy$54 billionEstimate
  2. 2Aerial view of Darwin, Northern Territory over Darwin Harbour.

    Ichthys LNG development

    2018 · Energy$34 billion
  3. 3Natural gas pipelines and LNG terminals around the world.

    Wheatstone LNG foundation phase

    2017 · Energy$29 billionEstimate
  4. 4Edmondson Street Bridge closed for replacement as part of the Inland Rail project.

    Inland Rail

    2026 · Railway$28.99 billionOn holdEstimate
  5. 5Graphic of eastern section of Melbourne Suburban Rail Loop.

    Suburban Rail Loop East

    2035 · Railway$22.23 billionUnder constructionEstimate
  6. 6Photo of the construction site of The Bays metro station, taken during October 2024

    Sydney Metro West, 2025 estimate

    Railway$18.04 billionUnder constructionEstimate
  7. 7Tunneling work for North East Link on Greensborough Road, Watsonia.

    North East Link

    2023 · Road or highway$17.34 billionUnder constructionEstimate
  8. 8Sydney Metro, Central Station, Sydney

    Sydney Metro City & Southwest

    2024 · Railway$13.62 billionUnder constructionEstimate
  9. 9Roma Street railway station, main entrance to the new underground Cross River Rail station, 2026

    Cross River Rail

    2025 · Railway$12.27 billionUnder constructionEstimate
  10. 10Photo of construction site of North Melbourne station as part of a community tour day on August 4 2019.

    Metro Tunnel

    2024 · Tunnel$8.9 billionEstimate
  11. 11HCMT at Seddon testing on the werribee line

    Melbourne Airport rail link

    2026 · Airport$8.38 billionUnder construction
  12. 12Talbingo Reservoir in summer with cumulus clouds building in the background.

    Snowy 2.0 hydropower project

    2023 · Energy$7.97 billionUnder construction
  13. 13A section of recently constructed railway track for en:Sydney Metro Western Sydney Airport, with the en:M12 Motorway (Sydney) visible on the left.

    Sydney Metro Western Sydney Airport

    2027 · Airport$7.57 billionUnder constructionEstimate
  14. 14West Gate Tunnel entrance portal during a Community Open Day on 16 November 2025.

    West Gate Tunnel Project

    Road or highway$6.57 billionEstimate
  15. 15Testing of the new carriages in Chatswood station

    Sydney Metro Northwest

    2017 · Railway$6.36 billion
  16. 16Bruce Highway passing through Mirriwinni, 2018

    Bruce Highway

    Road or highway$5.8 billionUnder constructionEstimate
  17. 17Plan of Western Harbour Tunnel and Warringah Freeway Upgrade

    Western Harbour Tunnel

    2029 · Tunnel$3.45 billionUnder construction
  18. 18Western Sydney Airport, aerial view of the terminal, January 2025

    Western Sydney International Airport Stage 1

    2026 · Airport$3.41 billion
  19. 19Clem Jones Tunnel Open Day - Under River

    Clem Jones Tunnel

    2010 · Tunnel$2.75 billion
  20. 20Metropolitan Ring Road looking west from Sydney Road, Fawkner, Victoria.

    M80 Ring Road

    2024 · Road or highway$2.51 billionUnder constructionEstimate
  21. 21New trams operating in George street Sydney CBD - late December 2019 - 49281061742

    CBD and South East Light Rail

    2020 · Railway$2.17 billionEstimate
  22. 22M6 Stage 1 Motorway Tunnel Portal President Ave June 2025 set to open in 2028

    M6 Motorway

    2025 · Road or highway$2 billionUnder construction
  23. 23This is the lightrail stop (perspective of both platforms) of Westmead.

    Parramatta Light Rail, Stage 1

    2024 · Railway$1.9 billion
  24. 24Abbot point port terminal infrastructure

    Abbot Point Terminal 1 99-year lease

    2011 · Port$1.89 billion
  25. 25The Twin Arch Bridges as part of the Sydney Gateway project, viewed from the shared path bridge across Alexandra Canal. The eastbound bridge has been completed and open to traffic. The westbound bridge at the back is still under construction.

    Sydney Gateway

    2024 · Road or highway$1.72 billion
  26. 26View of the Kwinana Freeway and the Mandurah line from the Thelma Street footbridge in Como, Western Australia, photographed in November 2025. A B-series train is visible.

    Mandurah line

    2007 · Railway$1.39 billion
  27. 27Road sign on Elizabeth Drive at Luddenham looking east

    Western Sydney Airport Motorway

    2026 · Road or highway$1.35 billion
  28. 28The High Wycombe dive structure, viewed from the platform at High Wycombe railway station. This is where Perth's Airport line enters a tunnel to pass under Perth Airport. A Transperth B-series train is shown exiting the tunnel.

    Perth — Forrestfield-Airport Link

    2022 · Railway$1.29 billion
  29. 29Perth stadium open day

    Perth Stadium

    2018 · Stadium$1.2 billion
  30. 30View of the Morley–Ellenbrook Line facing south from the Collier Road bridge over Tonkin Highway in Bayswater, Western Australia, June 2024. The railway line was nearing the end of construction at the time, with workers working on the overhead lines.

    Ellenbrook Line in Perth

    2024 · Railway$1.09 billion

How this ranking works

This is a curated catalogue, not an exhaustive list of every megaproject. Projects are ordered by their recorded US-dollar equivalent; each detail page shows the source amount and any currency conversion. Figures are not adjusted for inflation, and construction bills, estimates, and programme costs can have different scopes. Unbuilt proposals and cancelled projects are excluded.

More rankings

The most expensive projects in our catalogue

By type

Could you have guessed these?

BudgetGuessr shows you a real project every day and asks what it cost.

Play BudgetGuessr