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INFRASTRUCTURE
Overall
Most Expensive Construction Projects
This list features the reputedly most expensive construction projects in the world as of 2025.
RANK | PROJECT | LOCATION | COST | YEAR |
1 | US Interstate Highway System | United States | $459.0 billion | 1956 |
2 | International Space Station | Earth’s Orbit | $150.0 billion | 1994 |
3 | Kashagan Fields | Caspian Sea | $116.0 billion | 2013 |
4 | King Abdullah Economic City | Saudi Arabia | $95.0 billion | 2005 (ongoing) |
5 | Dubailand | Dubai, United Arab Emirates | $76.0 billion | 2004 (ongoing) |
6 | California High-Speed Rail | California, USA | $33.0 billion | 2029 |
7 | Kansai International Airport | Osaka, Japan | $29.0 billion | 1994 |
8 | Apollo Space Program | Earth’s Orbit & Moon | $25.4 billion | 1961-1972 |
9 | The Big Dig | Boston, Massachusetts, USA | $23.1 billion | 2007 |
10 | The Channel Tunnel | English Channel | $22.4 billion | 1994 |
References
Integra Recruitment, 2023. The top 10 most expensive construction projects in the world. [online] Available at: https://integrarecruitment.co.uk/the-top-10-most-expensive-construction-projects-in-the-world/ [Accessed 1 December 2025].
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