Inside the world’s largest building costing $1B — and it’s so massive it has its own weather system
June 2, 2026 in News by RBN Staff
source: irishstar
The Boeing Everett Factory in Washington is the world’s largest building by volume — so massive it once generated its own indoor weather system, and cost over $1 billion to construct
The Boeing Everett Factory holds the Guinness World Record for the largest building in the world by volume(Image: Boeing)
A colossal factory spanning over 472 million cubic feet claims the distinction of being the world’s largest building — and even produces its own microclimate.
The expansive Boeing plant in Everett, Washington, surpasses its nearest rival, the Tesla Gigafactory, by 33%. Since commencing operations in 1967, the facility has also produced more than 5,000 wide-bodied aircraft.
The impressive complex occupies 98 acres of land. To put that in context, the original Disneyland resort in Anaheim, California, covers approximately 85 acres.
The facility was born after Boeing’s then-President and Chairman, William M. Allen, determined that a completely new kind of manufacturing facility would be required to build the revolutionary 747.
The “jumbo jet” was roughly two-and-a-half times the dimensions of the largest passenger aircraft flying at that time.
The official Boeing Everett Factory Tour is exactly 80 minutes long(Image: Boeing )
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Multiple potential locations for the massive complex were considered, including one in California, but the 747’s chief engineer, Joe Sutter, had reportedly been hesitant to position the plant quite so distant from Boeing’s Seattle headquarters.
The company eventually selected a decommissioned military airfield located just 22 miles from its main offices. Boeing’s original buildings at the site had previously been used to construct the legendary B-17 Flying Fortress bomber during World War II. The project was completed at a remarkable pace, finished in slightly more than 12 months with expenses exceeding $1 billion — a figure that exceeded Boeing’s entire market value at the time, according to Airways magazine.
Tours are available
While a typical building site might require just a skip or two, Boeing faced the massive challenge of relocating 4 million cubic yards of earth to build the facility, necessitating a specially constructed railway line to haul all the displaced soil.
The result was a factory of such staggering scale that Disneyland could comfortably fit inside its walls. It even generated its own weather patterns; during its early years, clouds would form beneath its 90-foot-high ceiling due to moisture buildup.
Today, however, modern air conditioning has eliminated this extraordinary phenomenon.
Bonnie Hilory, executive director of the Future of Flight Foundation, told the local Everett Herald the factory was Boeing’s “best product.”
Visitors will see will see real commercial airplanes being built as the primary focus of the tour(Image: Getty Images)
She said, “I always tell people there’s one word to describe it and that’s scale. It’s just massive, with the biggest building, the biggest manufacturing and with giant aircraft inside of it.”
The already enormous facility has undergone two major expansions: first in 1978 to accommodate production of the Boeing 767, followed by another in 1992 for the considerably larger Boeing 777. More recently, additional structures have been built at the factory site to facilitate robotic assembly of the 777’s fuselage and manufacturing of the composite wing for Boeing’s newest 400-seat 777X.
36,000 workers on nearly 100-acre site
In 2024, approximately 36,000 employees report daily to the expansive 98-acre facility, working across three main shifts.
However, not all personnel are directly involved in aircraft manufacturing – some employees work in the site’s dedicated fire department, banking services, childcare facilities, medical clinic or water treatment plant.
The factory even employs its own specialized tour guides to escort visitors throughout the complex.
These tours have become incredibly popular, with 239,579 visitors paying $42 for the experience in 2024 alone.
David and Georgiana King, visiting from Sussex, U.K., have completed the tour twice — initially a decade ago and again in May 2025.
“This place brought us out here,” David said. “It was some of the same as last time but the 787 has been introduced since we were last here so it’s interesting to see how technology has changed.”
26 overhead cranes across 31 miles
While visitors are escorted through the main production floor, Boeing personnel can travel freely between various areas of the facility without interrupting aircraft assembly, thanks to an extensive underground tunnel system spanning over two miles.
More than a thousand bicycles are provided to help employees navigate these corridors, and several vans also circulate throughout the complex. At ground level, 12 button-activated doors allow entry, with the biggest standing an impressive 82 feet tall and 350 feet across.
A collection of 26 overhead cranes running along 31 miles of rail helps transport aircraft as they advance through the assembly line at an average speed of roughly 11⁄2 inches per minute.
The concluding stage of the production process – applying paint to the finished aircraft – can require up to a week. A 747 generally uses around 454 liters of paint, while a 787 demands slightly less, at approximately 370 liters.
It’s a careful and labor-intensive undertaking. Boeing anticipates the first 777X will be prepared for delivery to airlines by 2027.
As of November 2025, combined orders for both passenger and cargo variants of the 777X reached 619, spanning a dozen customers.
