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Fix the driver behind crashes, sound loss and screen glitchesFind Drivers →Clear out junk files and repair common Windows errorsFree Scan →Scan for outdated or missing drivers - takes under a minuteDriver Scan →By reported headline estimate, NEOM leads this list at US$500 billion+, followed by the Gulf Cooperation Council Railway at US$250 billion and the planned Medog Hydropower Station at US$137 billion+. These are estimates for projects with very different boundaries—not audited, like-for-like final costs. The ranking below sorts the figures reported in Construction Digital’s 2026 list from highest to lowest; its own order is based on physical scale and scope, not cost alone.
How to read this ranking
Each amount below is the headline figure reported by Construction Digital in 2026. The source does not establish a common price year or cost definition for all ten projects. Some figures refer to broad city developments or national infrastructure programmes; others cover a defined phase or facility. The amounts should therefore be read as reported estimates, not as comparable final outturns or sums already spent.
Rank is determined here by the reported headline amount, retaining plus signs and ranges. Where the source does not state a price base or more precise cost scope, that information is marked “not stated.” Project descriptions and status details in the table are also attributed to Construction Digital; they are not independently confirmed here.
The 10 projects, ranked by reported headline estimate
| Rank | Project and reported amount | What the estimate covers and reported status | Cost basis |
|---|---|---|---|
| 1 | NEOM — US$500bn+ | A broad Saudi development spanning several components, not one building contract. Construction Digital reported in 2026 that The Line had been suspended in September 2025 following an internal cost review. | Estimate year/price base and detailed cost boundary: not stated by Construction Digital. The “+” is retained from its reported figure. |
| 2 | Gulf Cooperation Council Railway — US$250bn | A proposed rail network across six Gulf states. Construction Digital reported a 2,177 km network and expected completion in 2030; this is a multinational programme with phases and segments. | Estimate year/price base and detailed cost boundary: not stated by Construction Digital. |
| 3 | Medog Hydropower Station — US$137bn+ | A planned 60 GW facility on the Yarlung Tsangpo in Tibet. Construction Digital reported construction began in July 2025 and commercial operations were planned for 2033. | Estimate year/price base and detailed cost boundary: not stated by Construction Digital. Capacity and schedule are reported by that source. |
| 4 | King Abdullah Economic City — US$100bn | A planned city development on Saudi Arabia’s Red Sea coast, including a port and industrial and business districts. | Estimate year/price base and detailed cost boundary: not stated by Construction Digital. |
| 5 | California High-Speed Rail, Phase 1 — US$89–128bn | The estimate is for Phase 1, not every element of the wider high-speed rail ambition. Construction Digital reported an original US$33bn estimate and a 2033 initial-service projection for the Merced–Bakersfield segment. | Estimate year/price base and detailed cost boundary for the range: not stated by Construction Digital. The range is retained as reported. |
| 6 | Jubail II — US$80bn | A large industrial-city expansion at Jubail, Saudi Arabia. The programme can encompass multiple facilities and enabling works. | Estimate year/price base and detailed cost boundary: not stated by Construction Digital. |
| 7 | Dubailand — US$64.3bn | A planned leisure destination with phased and stop-start progress, according to Construction Digital. | Estimate year/price base and detailed cost boundary: not stated by Construction Digital. This is a project estimate, not a reported amount already spent. |
| 8 | South-North Water Transfer Project — US$62bn | A multi-route system moving water from the Yangtze basin toward northern China. Construction Digital reported some routes operating while the western route remained under construction. | Estimate year/price base and detailed cost boundary: not stated by Construction Digital. The reported amount covers a broad system. |
| 9 | Al Maktoum International Airport expansion — US$35bn+ | A phased expansion in Dubai. Construction Digital reported a large target capacity and full completion extending into the 2030s. | Estimate year/price base and detailed cost boundary: not stated by Construction Digital. The “+” and forecast nature of the figure are retained. |
| 10 | Nusantara — US$32bn+ | Indonesia’s new capital city project. Construction Digital reported construction began in 2022 and the core government district was under development. | Estimate year/price base and detailed cost boundary: not stated by Construction Digital. This is a development estimate, not a final outturn. |
Why the figures are not directly comparable
Different project boundaries
A city development, a multi-country rail programme and one railway phase do not measure the same thing. NEOM, King Abdullah Economic City, Jubail II, Dubailand and Nusantara are broad developments; the South-North Water Transfer Project spans routes; California High-Speed Rail’s figure is explicitly for Phase 1. Even where the headline amounts look precise, the cost boundary may not be.
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Estimates, forecasts and final costs are different
A planned budget or forecast is not proof of how much has been paid, nor a final construction cost. Project status can change, and estimates may be revised. The plus signs and the California range matter: they signal that the reported number is not a single, settled outturn.
Price base changes the comparison
Inflation and the price year can materially alter a cost comparison. The National Infrastructure and Service Transformation Authority’s 2025–26 report states that it presents its portfolio costs in real 2024/25 terms and cautions that, because it is the first year using the approach, previous years’ monetary values are not directly comparable with this year’s. That government portfolio covers 189 projects, with a £924.2bn whole-life cost and £603.6bn in monetised benefits; those are portfolio figures, not a global construction-project total.
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What an official cost forecast can show
HS2 illustrates why a cost figure needs a defined scope and price base. In a report published 19 May 2026, the UK Department for Transport forecast an expected completion cost of £87.7–102.7bn in a mixed price base, including cash outturn for work to date and future work excluding inflation. For the same scope, it gave an equivalent 2019 mixed-price range of £70.9–82.2bn.
The forecast covers London Euston to Birmingham Curzon Street and the connection to the West Coast Main Line at Handsacre Junction, with an indicative expected Euston cost included. The department projected the opening stage for May 2036–October 2039 and the full scheme for May 2040–December 2043. These are forecasts, not completed costs. The department attributed two-thirds of the expected increase to necessary work omitted from the original plan, underestimation and inefficient delivery, and one-third to inflation; that is the department’s explanation.
What this list can—and cannot—tell you
It identifies ten enormous schemes with very large reported estimates, but it is not a definitive global league table of audited construction outturns. Construction Digital’s 2026 list uses physical scale and scope as its stated basis, so its published sequence is not a cost ranking; the order here simply rearranges its figures numerically. No globally harmonized statistic for the total cost of the ten most expensive 21st-century construction projects is established by the cited sources, so adding these unlike estimates together would create a misleading total.
For a genuine cost comparison, each entry would need a consistent currency and price year, a defined scope, and clarity on whether the amount is an approved budget, current forecast, whole-life cost or actual outturn. The reported figures here do not provide that common basis.
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