601 metres tall, Makkah Royal Clock Tower is a mixed-use skyscraper in Mecca, Saudi Arabia. It ranks number 4 among the world's tallest completed buildings by architectural height. [2]
This record covers the main clock tower, not every building in the Abraj Al Bait complex. The 2012 occupancy milestone is distinguished from reports of construction completion in 2011. See source ↗
INSIDE THE ENGINEERING
How Makkah Royal Clock Tower was built.
Design, structure and construction. Technical sources reviewed 9 September 2026.
The lower tower uses reinforced concrete. Above approximately 347 metres, steel-concrete composite construction reduces self-weight; above 513 metres, the upper structure is steel. The lateral system changes from core walls to a lighter trussed tube, following the demands of the increasingly slender crown.
SL Rasch was commissioned after the underlying hotel towers had already been structurally calculated. The clock addition therefore had a weight constraint. Four V-shaped supports carry the upper assembly, converging into the spire structure. Composite steel and concrete sections provide capacity while controlling dead load.
The specialist engineering scope extended beyond the permanent frame to erection planning, fabrication quality control and temporary crane supports. Both internal and external climbing cranes required engineered bracing. The transition between concrete, composite and steel construction made connection detailing and erection-stage stability central to delivery.
The clock hands use carbon-fibre shells, with stiffness supplied by their skins. The 23-metre crescent is a self-supporting fibre-composite structure. Using these materials limits the mass of large components exposed to wind at the top of the building.
: added a visible evidence register and change history. The initial evidence-register release preserved the existing measurements; subsequent corrections appear above.
Existing source decisions and caveats
This record covers the main clock tower, not every building in the Abraj Al Bait complex. The 2012 occupancy milestone is distinguished from reports of construction completion in 2011.
These notes predate this visible log. Their original change dates are not reconstructed.