Prefabrication (a.ka. modular construction or off-site manufacturing) is the next wave in building construction. The practice consists of assembling sections of a building in a factory, then shipping the sections to the construction site where they are connected.

Why is prefabrication so popular? Get this: It’s safer for workers, boasts a 1.13 benefit to cost ratio, and it’s radically faster than conventional construction methods.

How fast can buildings go up with the prefabrication method? Here are the top three fastest built buildings in the world (that we know of):

30 STOREY SKYSCRAPER IN 15 DAYS

Late in 2011, a 328-foot-tall, 30 storey tower called the T30 appeared in China’s Hunan Province, seemingly from out of nowhere. The skyscraper was built in only 15 days, at a fraction of the typical cost.

Here’s a video of the construction time lapse.

According to a basic calculation (number of stories and divided it by the number of days it took to build), the T30 is the third fastest built building in the world.

57 STOREY SUPERSTRUCTURE IN 19 DAYS

The same Chinese company that built the 30 storey tower in 15 days did one better: The Broad Sustainable Building Co. constructed a 57 storey ‘Mini Sky City’ in only 19 days. Mini Sky City boasts 19 atriums, 800 apartments and office space for 4,000 people. Broad claims they are the fastest building company in the world.

The Mini Sky City is the second fastest built building in the world.

10 STOREY HIGH-RISE IN 48 HOURS

In Mohali India, a team of over 200 people built a 10 storey building in just under 48 hours, thereby qualifying the feat as the fastest completed building in the country.

This 10 storey high-rise takes top spot and is the fastest built building in the world.

HONOURABLE MENTION: ONE STOREY HOUSE IN ONLY THREE HOURS

While not a gleaming skyscraper, it’s this last one still deserves recognition. Habitat for Humanity in Shelby County broke the world record for the fastest house ever built, clocking in at 3 hours, 26 minutes and 34 seconds.

And just in time for Christmas too. The recipient of the wonderful holiday gift was Bonnie Lilly, a single mother and nursing technician who desperately needed shelter.

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