There is no reliable, apples-to-apples ranking of the 10 most expensive bridges ever built: published figures mix bridge structures with entire crossings, use different currencies and price years, and sometimes rely on secondary estimates. The Hong Kong–Zhuhai–Macao Bridge (HZMB) illustrates the problem: one official source reports a cost for its 55-kilometer crossing system, while another gives an estimate for the Main Bridge project. Below are projects commonly cited among the costliest, with the available figures labeled by scope and basis rather than presented as a definitive ranking.
Why there is no definitive top-ten ranking
A meaningful cost comparison needs more than a number. A reported total might cover a bridge alone, or also include tunnels, artificial islands, approach roads, landworks and border facilities. It might be an original estimate, a reported construction cost or a later inflation-adjusted figure. Currency conversions introduce another variable unless the exchange-rate date is stated.
The figures available for these projects do not establish ten costs on one consistent basis. A 2020 secondary list names several bridges often described as exceptionally expensive, but its estimates do not form an official, comparable global cost series. Its order should not be treated as an authoritative ranking.
What the available figures show
These examples help explain why the title’s list cannot be ranked reliably from the available evidence. The figures have different scopes and price bases, so they should be read as separate project-cost reports, not as a direct league table.
Free tools Windows power users keep installed
One-click scans. No signup required.
#1 Best Overall
- BUILD A REAL DA VINCI INSPIRED BRIDGE Construct a working model based on Leonardo da Vinci’s famous self-supporting bridge design. This hands-on wooden STEM kit demonstrates real engineering principles through an engaging and rewarding building experience.
- EDUCATIONAL STEM LEARNING EXPERIENCE Explore concepts in engineering, architecture, physics, and history while building. Great for students, hobbyists, makers, homeschool projects, classroom activities, and anyone interested in mechanical design.
- APPROXIMATELY 1 HOUR BUILD TIME Designed to provide an immersive yet manageable project experience. The completed bridge makes an impressive display piece and conversation starter once assembled.
- HIGH-QUALITY WOODEN MODEL KIT – AGE 14+
- Made from durable precision-cut wood components with detailed illustrated instructions. A thoughtful gift idea for teens, adults, engineers, history enthusiasts, and STEM lovers.
| Project or figure | Reported cost | What the figure covers |
|---|---|---|
| Hong Kong–Zhuhai–Macao Bridge (HZMB), total system | CNY 127 billion (US$18.8 billion) | The U.S. Department of Transportation’s 2021 report describes a 55 km system of bridges, causeways, an undersea tunnel and artificial islands. It is not a bridge-deck-only figure. U.S. Department of Transportation, 2021 |
| HZMB Main Bridge, approved estimate | RMB 48.068 billion, as of December 2017 | Hong Kong’s Transport and Housing Bureau reported this approved estimate for the Main Bridge, up from RMB 38.118 billion approved in March 2010. It is not the same scope as the overall system cost above. Hong Kong Transport and Housing Bureau, 13 December 2017 |
| Øresund Bridge | DKK 14.8 billion in 1990 prices; approximately DKK 29.1 billion in 2025 prices | Sund & Bælt reports both price bases for the bridge. The separately reported Øresund Landanlæg cost is DKK 5.4 billion in 1991 prices, not part of the bridge figure. Sund & Bælt |
The 2020 Love Money list also names Great Seto, Danyang–Kunshan, the Bay Bridge East Span replacement, Great Belt, Akashi Kaikyo, Evergreen Point, Kerch and New Champlain. Its estimates are secondary and use mixed bases; no consistent official series is established for comparing those projects with one another. Love Money, 20 November 2020
Why the HZMB figures differ
The crossing system is larger than the Main Bridge
Hong Kong’s government describes the HZMB as two parts: a Main Bridge in mainland waters, comprising 22.9 kilometers of bridge and a 6.7-kilometer subsea tunnel, and link roads and boundary-crossing facilities under the separate responsibility of the three governments. Hong Kong Government, 21 November 2017
Rank #2
- Build 20 different models that each teach about force, load, compression, tension and more
- Over 285 interchangeable building pieces
- Includes 36-page, illustrated experiment manual and Assembly guide
- Skill level: Intermediate
The U.S. Department of Transportation’s broader 55 km system description includes three cable-stayed bridges, causeway sections, an undersea tunnel and four artificial islands. Its CNY 127 billion (US$18.8 billion) total therefore cannot be compared directly with the Hong Kong Bureau’s approved estimate for the Main Bridge alone. U.S. Department of Transportation, 2021
The Main Bridge estimate changed over time
Hong Kong’s Transport and Housing Bureau said the approved Main Bridge estimate rose from RMB 38.118 billion in March 2010 to RMB 48.068 billion by December 2017, an increase of about RMB 9.95 billion. The Bureau attributed the rise to complicated open-sea construction conditions, difficult construction methods, higher labor and material costs, and refinements to design and construction schemes. Those are the government’s stated explanations for this project, not a general explanation for overruns on other bridges. Hong Kong Transport and Housing Bureau, 13 December 2017
The Tool Desk
Outbyte Driver Updater FREEScan for outdated or missing drivers - takes under a minuteDriver Scan →Outbyte PC Repair FREERepair Windows errors before they cause bigger problemsFix Now →Rank #3
- HOBBY MODEL KIT – Unassembled model packed in an envelope with easy to follow instructions. Ideal for ages 14 and up.
- NO GLUE OR SOLDER NEEDED – Parts can be easily clipped from the metal sheets. Tweezers are the recommended tool for bending and twisting the connection tabs.
- PREMIUM SERIES GOLDEN GATE BRIDGE - 2.5 Sheet Model with a moderate difficulty level. Once assembled, dimensions are 14.45 L x 0.94 W x 2.95 H inches. 1:7535 Scale.
- FROM STEEL SHEETS TO 3D – Pop out the pieces and connect using tabs and holes. Includes illustrated instructions
- HIGHLY DETAILED ETCHED MODEL – Display your 3D model once completed - collect and build them all.
How to compare bridge costs fairly
Before deciding which project was more expensive, check whether the figures measure the same things and use the same price basis. A useful comparison should state:
- Scope: whether the cost covers a bridge structure or also tunnels, artificial islands, approaches, landworks and boundary facilities.
- Price basis: the currency, original price year and any inflation-adjustment method. Keep converted currencies tied to a stated exchange-rate date if one is provided.
- Cost stage: whether the figure is an early estimate, an approved budget or a reported construction cost, and the date it applies to.
- Project type: whether it is a single road bridge, a railway viaduct or a multi-part crossing system.
For example, Øresund’s operator distinguishes the bridge’s DKK 14.8 billion construction cost in 1990 prices from the approximately DKK 29.1 billion equivalent in 2025 prices, and lists landworks separately. Comparing either bridge figure with a total crossing-system cost without noting those distinctions would obscure what the numbers measure. Sund & Bælt
Rank #4
- THE WOODEN SYDNEY BRIDGE 3D MODEL KIT COMES WITH UNIQUE DESIGN YOU WILL LOVE - Be proud to display your assembled Sydney 3D Bridge Wood Puzzles and share your love for iconic landmarks in Sydney Australia. This wooden 3d puzzle bridge makes a model kit for kids who loves architecture model kits, bridge building kit, and 3D building sets for adults. Ideal for kids to start getting interested in building bridges or young engineers building kit.
- THE SYDNEY 3D BRIDGE WOODEN MODEL KIT PUZZLE IS FOR EVERYONE WHO LOVES ICONIC PUZZLES - The Sydney Bridge 3D wooden puzzles for adults and kids is a craft kit to build for those who love playing mind games. Parents can gift 3D wooden puzzles, or architecture model building like this Sydney Bridge to improve mental speed and problem solving skills of their kids. A good bonding project for family, or as kids architecture kit project for school.
- INCLUDED WITH THE PURCHASE OF THE 3D BRIDGE WOOD PUZZLE KIT - Includes 1 Sydney 3D Bridge Wood Craft Puzzle Decor Model Kit with 55 unfinished natural wood puzzle pieces, manual, and 1 paper for sanding the edges. This DIY puzzle bridge building kit for kids can be painted or colored for a more personalized look. Most parts doesn't require glue as the pieces are interlocking. It measures 16.54Lx4.13Wx5.31H inches. Paint and Glue not included.
- HIGH-QUALITY WOODEN PUZZLES FOR ADULTS AND KIDS - This miniature iconic 3D Puzzle Sydney Bridge Wood Model Kit is made of high-grade 3mm natural wood. All wooden puzzle pieces are laser cut and sanded thoroughly to ensure smooth edges. This bridge building educational 3D puzzle feature realistic details of the Sydney bridge, like its arch and towers. Playfully paint this architecture puzzle toy bridge model kit for kids after assembling.
- IDEAL USE FOR THE SYDNEY 3D BRIDGE ADULTS AND KIDS WOOD BUILDING KITS - Challenge your kids or even yourself to build this DIY 3D wooden puzzle Sydney bridge. A perfect addition to your kids wood project, wooden building kits for adults, or wooden Australia puzzles collection. This architecture model building kit puzzle toy can help kids develop their skills in building wood bridge, raise their IQ, problem solving, and shape recognition.
What the figures can—and cannot—tell you
The documented costs show that some bridge projects are discussed in very large totals, but they do not support a definitive ordering of ten bridges by expense. The HZMB and Øresund examples make the key issue clear: scope and price year can materially change the figure being compared. A list based on mixed estimates may be useful for identifying commonly cited costly projects, but its rank numbers should not be mistaken for a like-for-like accounting.
Quick Recap
Best Value
- HOBBY MODEL KIT – Unassembled model packed in an envelope with easy to follow instructions. Ideal for ages 14 and up
- NO GLUE OR SOLDER NEEDED – Parts can be easily clipped from the metal sheets. Tweezers are the recommended tool for bending and twisting the connection tabs
- BROOKLYN BRIDGE – 2 Sheet Model with a moderate difficulty level. Once assembled, dimensions are 5.39"L x 0.91"W x 1.97"H (13.7 x 2.3 x 5 cm)
- FROM STEEL SHEETS TO 3D – Pop out the pieces and connect using tabs and holes. Includes illustrated instructions
- HIGHLY DETAILED ETCHED MODEL – Display your 3D model once completed - collect and build them all
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
