The tallest building in Dubai is the Burj Khalifa, at 828 metres (2,717 ft) with 163 occupiable floors. Opened on 4 January 2010, it is also the tallest building in the world — a title it has now held for more than a decade and a half, by a margin no completed structure has come close to challenging.
828 Metres, and What the Number Covers
Height figures for skyscrapers are notoriously slippery, so it helps to be precise about what is being measured. The Council on Tall Buildings and Urban Habitat, which adjudicates these things, records the Burj Khalifa at 828 m to architectural top — a category that includes spires but excludes antennas, flagpoles, and other equipment that could be removed without altering the design.
By other measures: the highest occupied floor sits at about 585 m, the roof of the concrete structure at roughly 585–600 m depending on definition, and the tip at 828 m. The spire alone accounts for well over 200 metres, which has drawn the criticism that a large share of the record is unusable steel. That is fair, but not unusual — most supertall towers taper into unoccupied structure, and the Burj Khalifa's occupied height alone would still comfortably lead the world.
The scale is hard to hold in your head. It is roughly three times the height of the Eiffel Tower, about twice the Empire State Building, and tall enough that the temperature at the top typically runs several degrees cooler than at street level. People at the base can watch the sun set, take the lift up, and watch it set again.
The Buttressed Core
The tower's floor plan is a Y — three wings radiating from a central hexagonal core — and this shape is the whole engineering argument, not a stylistic flourish. The system, devised by structural engineer Bill Baker at Skidmore, Owings & Merrill with design architect Adrian Smith, is called a buttressed core.
At extreme height, the governing problem is not gravity but wind. A slender tower behaves like a vertical cantilever, and the loads trying to bend and twist it dwarf the loads trying to crush it. The buttressed core answers this by having each of the three wings brace the central core against the other two. Every wing has its own corridor walls and perimeter columns tied back to the core by shear walls, so the whole assembly acts as one enormously stiff shaft rather than three separate blades.
The layout has a practical dividend: the Y-plan gives residential floors abundant window area and views in every direction, which is exactly what you want in a building selling apartments. The form is frequently described as taking inspiration from the Hymenocallis, a desert flower with three radiating groups of petals.
Confusing the Wind
As the tower rises, the wings step back in a spiralling series of setbacks — 27 of them — so that the cross-section changes shape and size all the way up.
This is deliberate aerodynamic sabotage. Wind flowing past a tall building sheds alternating vortices off each side, and if those vortices detach in a regular rhythm they push the tower rhythmically sideways, potentially near its natural frequency. That is the phenomenon that makes slender towers sway uncomfortably or, at worst, dangerously. By constantly changing the profile with height, the setbacks ensure that vortices shed at different frequencies at different levels and never organise into a single coherent push. Wind-tunnel testing on scale models drove the specific arrangement, and the final orientation was rotated to suit Dubai's prevailing winds.
The alternative approach — adding a huge tuned mass damper, as Taipei 101 famously did — was not needed here. The Burj Khalifa's stiffness comes from its geometry.
Building It
Construction ran from 2004 to 2009, with Samsung C&T leading the contracting consortium and a peak workforce numbering in the thousands.
The foundation had to work in weak, salty coastal ground. It uses a mat roughly 3.7 metres thick supported on around 192 bored concrete piles, each about 1.5 m in diameter and driven more than 40 metres down, with cathodic protection against the aggressive saline groundwater.
The signature feature of the build, though, was the concrete. High-strength mix had to be pumped vertically to record heights — over 600 metres in a single stage — which required specially formulated concrete that would stay pumpable under enormous pressure yet set correctly on arrival. Pours were scheduled at night through the summer, because concrete cured in Dubai's daytime heat develops thermal cracking. Above roughly the 156th floor the structure switches from reinforced concrete to a structural steel spire, assembled inside the building and jacked upward into position.
The exterior carries around 26,000 individually cut glass panels, specified with reflective coatings to reject solar gain in a climate where cooling is the dominant energy cost.
Inside, and the Name That Changed
The building is genuinely mixed-use rather than a single-tenant office tower. The lower levels hold the Armani Hotel, designed by Giorgio Armani; above that sit residential apartments, then corporate office floors higher up, along with observation decks and mechanical levels distributed through the tower. Its lifts run at roughly 10 metres per second, among the fastest in service anywhere.
The name is a piece of recent history in itself. The project was launched and built as Burj Dubai. When Dubai's property market collapsed in the 2008–09 financial crisis and the emirate faced a severe debt crunch, Abu Dhabi extended substantial financial support. At the opening ceremony in January 2010, the tower was unveiled as the Burj Khalifa, honouring Sheikh Khalifa bin Zayed Al Nahyan, then president of the UAE and ruler of Abu Dhabi. The renaming was announced on the night, to the surprise of most people present.
At the base, the Dubai Fountain and The Dubai Mall complete a development designed as a single destination — the tower is the anchor of Downtown Dubai rather than a standalone monument. The Burj Khalifa landmark guide covers the visitor experience and the observation decks in more detail; the two main ones are on levels 124 and 125, with a premium deck on level 148 at around 555 metres.
The Rest of the Skyline
Dubai's second tier is a long way down but still remarkable by global standards, and almost all of it postdates 2000.
- Marina 101 — around 425 m, in Dubai Marina.
- Princess Tower — around 414 m, briefly the world's tallest residential building.
- 23 Marina — around 393 m.
- Gevora Hotel — around 356 m on Sheikh Zayed Road, long billed as the world's tallest hotel.
- Almas Tower — around 360 m, the diamond exchange tower in Jumeirah Lakes Towers.
Dubai has more completed buildings above 300 metres than almost any other city, a density explained less by land scarcity than by a development model in which height itself is the product. Dubai Creek Tower, an Emaar project intended to exceed the Burj Khalifa, was begun, paused, and has since been revived with a redesign — so the city may eventually be competing against itself. The way the emirate's urban form grew along a single coastal corridor is set out in more detail in the guide to Dubai's geography.
What Counts as Height
Comparing supertall buildings requires agreeing what is being measured, and the body that arbitrates it is the Council on Tall Buildings and Urban Habitat.
Its rules recognise three heights: to architectural top, which includes spires because they are considered part of the design; to highest occupied floor; and to tip, which includes antennas and masts. A spire counts toward the headline figure and an antenna does not, which is why some towers appear to gain tens of metres from a decorative point that nobody can stand on.
The gap between the categories can be large. The distance from the Burj Khalifa's highest occupied floor to its architectural top runs to well over a hundred metres of structure that exists to make the building taller rather than to hold anyone.
Burj Khalifa Against Merdeka 118 and Jeddah Tower
The nearest completed rival is Merdeka 118 in Kuala Lumpur, finished in 2023 at about 678.9 metres. It is the world's second-tallest building and a genuine achievement — yet it falls roughly 150 metres short, a gap larger than most skyscrapers are tall. Shanghai Tower, at 632 m, sits third. No completed building has meaningfully threatened the record in fifteen years, which is unusual: before 2010, the title changed hands every few years.
Merdeka 118 also differs in kind. It uses a more conventional core-and-outrigger system with a faceted glass envelope, and a very large share of its height is a slender spire. Its structural challenge was as much about building on soft ground riddled with limestone cavities as about wind. Kuala Lumpur's tallest building is the better comparison for engineering under difficult geology; the Burj Khalifa is the better comparison for engineering against wind.
The serious challenger is unbuilt. Jeddah Tower in Saudi Arabia, designed by the same architect who led the Burj Khalifa, targets over 1,000 metres — breaking the kilometre barrier. Construction stalled for years and resumed in 2023. If completed as designed it will take the record by a wide margin, using a comparable three-winged buttressed-core logic scaled up. Until then, the Burj Khalifa remains not merely Dubai's tallest building but the tallest anything humans have finished, and for the wider ranking the guide to the world's tallest buildings sets out how the rest of the list has shifted around it.