Why the Jeddah Tower Won't be as Tall as You Think

TL;DR

The Jeddah Tower's spire could exceed 300 metres of pure vanity height, meaning its actual usable floors fall far short of its official 1km architectural height.

Key Points

• 1.Buildings are measured to their architectural top, not their highest usable floor. The Council on Tall Buildings rules that functional antennas (like Willis Tower's masts) don't count, but decorative spires (like Petronas Towers' 46m spires) do, giving Malaysia the title over Chicago in 1998.
• 2.'Vanity height' is the gap between the highest occupiable floor and the architectural peak. Merdeka 118 holds a staggering 176-metre vanity height — its spire references the silhouette of Malaysia's founder declaring independence in 1957.
• 3.The Burj Khalifa holds the record for largest absolute vanity height at 242 metres. Dubai used skyscraper excess strategically to transform from a sparse port into a global metropolis, triggering an industry-wide explosion in vanity heights after the 2000s.
• 4.The Chrysler Building's record-breaking spire was built in secret and installed overnight in October 1929. Architect Van Alen hid the 38-metre spire inside the roof to blindside rival 40 Wall Street, taking the final height to 319 metres.
• 5.Stalin's Ukraine Hotel nearly fails the definition of a 'building' due to its vanity height. Its 73-metre spire and pedestal consume 42% of total height — just below the 50% unoccupiable threshold that would reclassify it as a tower, not a building.
• 6.The Jeddah Tower's spire alone could exceed 300 metres, making its vanity height taller than most supertall skyscrapers. Built to surpass the 828m Burj Khalifa at exactly 1km, its steel upper structure from floor 167 upward houses only maintenance ladders and aircraft warning beacons.