Since 2010, the Burj Khalifa has held the title of the world’s tallest building, a record that has stood as a benchmark of human engineering ambition. That reign may soon end with the completion of the Jeddah Tower in Saudi Arabia, a structure designed to pierce the sky at an astonishing 3,307 feet (1,008 meters). Rising from the shores of the Red Sea, this 167-floor megaproject represents a new chapter in skyscraper design, pushing the limits of structural engineering, foundation technology, and construction logistics. Its anticipated cost of $1.23 billion reflects the immense scale of the undertaking. For those fascinated by how modern towers redefine urban skylines, the Inaura Tower Dubai how MVRDV designed a luxury hotel and residential tower with a jewel-like ovoid structure for downtown Dubai offers another compelling example of architectural innovation in the region.
Design Vision, Architecture, and Mixed-Use Program
The Jeddah Tower, originally named Kingdom Tower, was conceived as the centerpiece of the Kingdom City development, a massive planned community north of Jeddah. Designed by the American architectural firm Adrian Smith + Gordon Gill Architecture, the tower draws its form from the folded fronds of a desert plant, creating a tapering, triangular profile that narrows as it rises. This shape is not merely aesthetic but serves a critical structural purpose: it reduces wind loads by breaking up vortices that would otherwise cause dangerous swaying at extreme heights.
The building’s design incorporates a series of notches and setbacks that interrupt the wind flow around the structure, a technique that becomes increasingly important as a building surpasses the 800-meter mark. Each wing of the triangular floor plate is stepped back at regular intervals, creating a dynamic silhouette while simultaneously channeling wind forces away from the facade. The tower was designed as a mixed-use vertical city, with different programs stacked along its 167 floors. The distribution of functions was carefully planned to optimize operational efficiency while maximizing the value of its iconic height. For comparison, the role of Tower Bridge construction features of the world famous symbol of London demonstrates how structural form has long been shaped by environmental forces, though on a very different scale.
| Floor Range | Function |
|---|---|
| B1 to B2 | Parking and service levels |
| Ground to Lobby | Grand entrance, retail, and public atrium |
| Floors 1 to 40 | Class A office space |
| Floors 41 to 78 | Four Seasons hotel with over 300 rooms |
| Floors 79 to 158 | Residential apartments and serviced suites |
| Floors 159 to 165 | Sky lobby, observation deck, and restaurant |
| Floor 166 to 167 | Mechanical and communications equipment |
The observation deck, planned for floors 159 and 160, was designed to offer views that extend over 80 kilometers across the Red Sea on clear days. This would make it the highest public observation deck in the world, surpassing the Burj Khalifa’s At the Top SKY level on floor 148. The residential apartments were marketed to ultra-high-net-worth individuals, offering private elevator access, concierge services, and uninterrupted sea views from every unit. With 59 elevators planned, including double-decker cabs, the tower was designed for efficient vertical transportation across its entire height.
Structural Engineering and the Challenge of Extreme Height
Supporting a building that is over half a mile tall requires a structural system unlike any built before. The Jeddah Tower employs a high-performance reinforced concrete core that runs through the center of the building, providing the primary vertical support. This core is supplemented by six massive concrete buttress walls that extend outward from the center, forming a Y-shaped floor plan that gives the tower exceptional lateral stability.
The key structural challenges at this height include:
- Wind resistance – At 1,008 meters, wind speeds can exceed 100 mph, requiring the building to be designed for minimal sway that does not discomfort occupants. The stepped wings help break up wind vortices before they can synchronize.
- Material strength – The concrete used in the lower 200 meters of the core had to achieve compressive strengths exceeding 100 MPa, nearly three times that of standard structural concrete.
- Vertical load transfer – The immense weight of the upper floors must be distributed evenly through the core and wings to prevent differential settlement across the foundation.
- Thermal expansion – The temperature difference between the sun-exposed facade and the shaded side can cause differential expansion, which must be accommodated by the structural frame and expansion joints.
- Crane reach – Standard tower cranes cannot reach the upper floors, so a special climbing crane system was designed to ascend with the structure as it rose.
To better understand how this structure compares with other record-breaking towers, the detailed comparison at Jeddah Tower vs Burj Khalifa provides a side-by-side analysis of how the two megastructures differ in their engineering approaches and performance targets.
Foundation Design and Ground Conditions
The foundation of a building of this scale is as critical as the structure it supports. The Jeddah Tower sits on a massive reinforced concrete mat that is 5 meters thick, covering the entire footprint of the building. Beneath this mat, a field of 270 bored cast-in-place piles extends deep into the ground, reaching depths of up to 110 meters to find competent bearing strata.
The ground conditions in Jeddah presented unique challenges. The site is located near the Red Sea coast, where the water table is high and the subsurface consists of layered coral limestone and sandstone. The design team conducted extensive geotechnical investigations, including boreholes drilled to depths exceeding 120 meters, to characterize the variability of these formations. The foundation was designed to limit total settlement to less than 100 millimeters, an extraordinarily tight tolerance for a structure weighing over a million tons.
| Foundation Element | Specification |
|---|---|
| Mat thickness | 5.0 meters (16.4 feet) |
| Number of piles | 270 |
| Maximum pile depth | 110 meters (361 feet) |
| Concrete volume in mat | ~17,000 cubic meters |
| Steel reinforcement in mat | ~3,500 metric tons |
| Design bearing capacity | Exceeds 15,000 kPa |
| Foundation depth below grade | 12 meters (39 feet) |
The lessons learned from historical foundation challenges are instructive here: the key aspects of San Marco Bell Tower foundation reconstruction of the tallest structure in Venice highlight how foundational engineering has evolved over centuries to handle extreme loading conditions on difficult soil.
Construction Methods and Vertical Logistics
Building the world’s tallest structure requires construction techniques that are as innovative as the building itself. The Jeddah Tower project relied on a combination of traditional reinforced concrete construction with advanced formwork systems that allowed floor cycles of approximately four to five days during peak construction. The concrete was pumped using high-pressure systems capable of lifting material vertically over 600 meters, a feat that required custom-designed pumping equipment and specialized concrete mixes that remained workable under extreme pressures.
The construction process involved several critical workflows that had to be sequenced precisely:
- Core advancement – The central concrete core was poured ahead of the surrounding floors using a self-climbing formwork system. This allowed the core to act as a stabilizing element for the rest of the structure as it rose.
- Buttress wall construction – The six concrete buttress wings were cast in sequence, each tied back to the core through post-tensioned floor slabs that locked the system together.
- Facade installation – The curtain wall system was installed from the inside, with panels lifted by external hoists and then positioned using monorails running along the perimeter of each floor.
- MEP rough-in – Mechanical, electrical, and plumbing systems were installed concurrently with structural work on a five-floor lag, ensuring continuous workflow without delays.
- Elevator core preparation – Shafts for 59 elevators were cast integrally with the main structure, including provisions for the world’s longest elevator travel distance at over 660 meters.
When examining how slender supertall structures handle these construction challenges, the Steinway Tower worlds thinnest skyscraper 2 provides a fascinating contrast in how extreme proportions affect construction sequencing and structural behavior at the upper limits of buildability.
Progress, Delays, and the Path Forward
Construction of the Jeddah Tower began in earnest in 2013, and by 2017 the structure had reached 56 floors at a height of 252 meters. During that period, the Executive Director of the Council on Tall Buildings and Urban Habitat, Dr. Anthony Wood, visited the site and documented the progress, noting that the views from even a quarter of the final height were already breathtaking. The project was originally scheduled for completion in 2020, but a combination of factors led to significant delays.
The primary challenges that slowed construction included:
- Labor disputes – Thousands of migrant workers reportedly faced wage issues, leading to disputes that slowed construction activities for extended periods.
- The COVID-19 pandemic – Global supply chain disruptions and workforce restrictions halted work for extended periods beginning in early 2020.
- Financial restructuring – The 2014 oil price downturn affected Saudi government revenues, impacting the Kingdom City development’s overall funding mechanism.
- Contractor changes – The original construction consortium faced reorganization, requiring new contractual arrangements and mobilization plans.
As of recent updates, the project has resumed with renewed momentum. The Saudi Binladin Group was reinstated as the main contractor in 2023, and site preparation for resuming vertical construction has been underway. When completed, the tower will reclaim the world’s tallest title for Saudi Arabia. Historical examples of structural resilience remind us that even the most ambitious towers face setbacks, as the essential guide to Leaning Tower of Pisa an architectural marvel or engineering failure illustrates through centuries of structural adaptation and correction.
Conclusion
The Jeddah Tower stands as a testament to what the construction industry can achieve when vision, engineering, and determination align. From its wind-defying triangular form to its 110-meter-deep foundation piles, every element of this building pushes beyond established limits. It represents not just a taller building, but a fundamentally different approach to vertical urbanism, one that integrates residential, commercial, hotel, and observation functions within a single superstructure reaching over a kilometer into the sky.
The journey to complete the world’s next tallest building has been marked by technical triumphs and unexpected setbacks, but the lessons learned along the way will inform skyscraper design for decades to come. Whether it is the concrete mix design that enables pumping to unprecedented heights, the foundation engineering that anchors a million-ton structure to the coastal soil of Jeddah, or the wind-tunnel testing that shaped every curve of its facade, the knowledge gained from this project will benefit the entire construction profession. Even as delays have tested patience, the underlying engineering achievements remain. The collapse of Willow Island cooling tower one of the worst construction disasters in the history of US serves as a sobering reminder of why rigorous engineering, quality control, and safety protocols matter at every stage of a project of this magnitude.