BudgetGuessr rankings

The most expensive megaprojects from Turkey in our catalogue

The 30 most expensive of 35 built and under-construction megaprojects in Turkey in the BudgetGuessr catalogue, ranked by documented cost in US dollars.

1
Akkuyu Nuclear Power Plant
2028 · Energy$20 billionUnder constructionEstimate$20 billionUnder constructionEstimatePublished project estimate
2
Istanbul Airport
2018 · Airport$12.05 billion$12.05 billion€10.2 billion · Reported project cost
3
TANAP gas pipeline, 2018 investment claim
2018 · Energy$8 billion$8 billionReported project cost
4
Motorway 5
2019 · Tunnel$7 billion$7 billionFinal project cost
5
Marmaray Tunnel
2021 · Tunnel$4.78 billion$4.78 billion€4.0396 billion · Final project cost
6
Çanakkale 1915 Bridge
2022 · Bridge$2.63 billion$2.63 billion€2.5 billion · Final project cost
7
Deriner Dam
2012 · Dam$1.4 billion$1.4 billionReported project cost
8
Osmangazi Bridge
2016 · Bridge$1.3 billion$1.3 billionReported project cost
9
Istanbul — Marmaray — CR3
2011 · Railway$1.3 billion$1.3 billion€932.8 million · Contract value
10
Atat?rk Dam
1992 · Dam$1.25 billion$1.25 billionReported project cost
11
Eurasia Tunnel
2016 · Tunnel$1.25 billion$1.25 billion$1.245 billion · Final project cost
12
Istanbul — M7 — M7 Phase 3
2017 · Railway$834.4 millionUnder construction$834.4 millionUnder constructionTRY 3.044 billion · Approved budget
13
Yavuz Sultan Selim Bridge
2016 · Bridge$818 million$818 millionReported project cost
14
Istanbul — M5 — M5 Phase 1
2012 · Railway$805.56 million$805.56 million€627 million · Contract value
15
İzmir Metro M2 (Buca Metro)
2021 · Railway$771.15 millionUnder construction$771.15 millionUnder construction€652 million · Approved budget
16
Istanbul — M1 — M1B
2017 · Railway$661.82 millionUnder construction$661.82 millionUnder constructionTRY 2.4144 billion · Approved budget
17
Polatlı-Konya high-speed railway
2011 · Railway$597.03 million$597.03 millionTRY 1 billion · Reported project cost
18
Keban hydroelectric project
1982 · Dam$400 millionEstimate$400 millionEstimatePublished project estimate
19
Ankara M4 (Keçiören Metro)
2017 · Railway$331.11 million$331.11 millionTRY 1 billion · Reported project cost
20
Istanbul Sapphire
2011 · Skyscraper$250 million$250 millionReported project cost
21
Golden Horn Metro Bridge
2008 · Bridge$215.79 million$215.79 million€146.7228 million · Contract value
22
Türksat 6A
2024 · Space mission$164.47 millionEstimate$164.47 millionEstimateTRY 600 million · Published project estimate
23
75th Anniversary Selatin Tunnel
2000 · Tunnel$121 million$121 millionReported project cost
24
Atat?rk Olympic Stadium
2002 · Stadium$116.11 million$116.11 million$116.1132 million · Reported project cost
25
Papara Park
2016 · Stadium$115.89 million$115.89 millionTRY 350 million · Reported project cost
26
Rams Park
2011 · Stadium$114.33 million$114.33 millionTRY 191.5 million · Reported project cost
27
Beşiktaş Stadium
2016 · Stadium$111.58 million$111.58 millionTRY 407.0472 million · Final project cost
28
Şükrü Saracoğlu Stadium
2006 · Stadium$85 million$85 millionReported project cost
29
Ba?ak?ehir Fatih Terim Stadium
2014 · Stadium$81.33 million$81.33 millionTRY 178 million · Reported project cost
30
Buca Onat Tunnel
2025 · Tunnel$76.04 millionUnder constructionEstimate$76.04 millionUnder constructionEstimateTRY 3 billion · Published project estimate

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.

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