Terrafab Size Comparison: Largest Building on Earth

Technology Architecture Science

Sep 24, 2026 · 4 min read

Terrafab Size Comparison: Largest Building on Earth

A 100 million square foot building — bigger than the Burj Khalifa by 20 million square feet — is being built in Boca Chica, Texas, with many more to come.

Terrafab is a colossal structure that measures over 100 million square feet, Elon Musk called it 'the most valuable building on Earth by far.'. He’s believed to be referring to the climate-controlled dome and building at his Starbase Starfactory & SpaceX Boca Chica facility.

The Blue Domes of Starbase

Terrafab is the giant structure where SpaceX plans to build the Starship. The consumably-built Starbase will house companies involved with or influenced by SpaceX. As well as the dome over the original Starfactory, another 300 ft dome is pictured — expected to cover the new SpaceX factory. This is the blueprint for the where and how of future human habitation. No other existing building is complete to compare. No, not even the Mall of America

What’s at stake here

This is a part of Mars colonization development. Terresterial planned construction will happen on the red planet next. Terresterial cities will need infrastructure. Literally, this dome will shape the future — and that's why Elon Musk is so excited about it. The future of humanity is not on Earth. We're going to make life multiplanetary. Some of the first people will live in a building like this. The building that will eventually be built on Mars, the first city on Mars, people will be living in there.

The What and Where of Terrafab

Terrafab will be the first dome on Mars. It will be more ambitious. You know, there's a long term plan for Humanity to live on Mars in a series of domes, covering hundreds of square miles. With this infrastructure, the dome houses and develops the Starship spacecraft, rockets and equipment, Starbase and the company headquarters. The Starfactory dome will assist in the development of Mars Airships, Mars Starships and possible Mars cities. Realizing Musk’s dream of expanding humanity beyond Earth, Terrafab is the starting point.

The Why of Terrafab

The scale of Terrafab is more important than you might realize. This is the biggest building that exists now. If you're describing a factory or a building that is being built with a goal of being built on Mars, it's pretty important to have it right. The bigger project will have to withstand Mars' harsh climate. Elon Musk is counting on this project. No, he's not just counting on it, he's 1000% betting on it, critical to his Mars colonization vision

The When of Terrafab

Elon Musk has asserted that SpaceX will begin shipping people to Mars in the mid-2020s. With the recent announcements from the team, this means that the development of Terrafab and the associated infrastructure will need to be accelerated. This is a big moment for anyone trying to make humanity multiplanetary. There's a lot happening right now. The things that are going to be happening in the next couple of years will be very exciting

A Closer Look

It’s unclear which project Elon Musk was referring to. One of his world-changing SpaceX projects, the Terrafab projects or Musk’s Neutrino observatory project, SpaceX’s orbital launch and return of Starship could all be in play. Either way, it's going to center around this 100 feet x 100 feet building. Not bad. The future is the dome. Get your head around that — the future is the dome

Practical Steps

If you’re interested in SpaceX’s projects or potential future developments:

  • Follow the announcement from SpaceX to know more about the launch date and important updates about this project.
  • Study the proposals made by SpaceX for extensive project ideas and their timelines. Elon Musk discussed possible timelines for the dazzling projects which could involve public submissions, such as on Google docs.
  • Stay updated about upcoming SpaceX projects in the next few months. Observe SpaceX’s YouTube channel to know the latest updates.
  • Follow the live stream for more updates on Terrafab

Building Destiny

Elon Musk is calling this aspect of Terrafab the greatest construction project of all time. It's the biggest of all. And Musk is right. The significance of this project just cannot be overstated.

Questions readers ask

What exactly is Terrafab and what does it look like?

Terrafab is a massive structure being built in Boca Chica, Texas, covering over 100 million square feet. It includes a large dome and other buildings where SpaceX plans to build the Starship and house companies involved with or influenced by SpaceX.

Why is Terrafab considered the 'most valuable building on Earth'?

Elon Musk considers Terrafab the most valuable building on Earth because it's a crucial part of his vision for Mars colonization. It will serve as a prototype for future Martian habitats and is essential for developing the infrastructure needed for human life on Mars.

How does Terrafab compare to other large buildings like the Burj Khalifa?

Terrafab is significantly larger than the Burj Khalifa, both in terms of square footage and overall scale. While the Burj Khalifa is the tallest building in the world, Terrafab is the largest building by area, covering over 100 million square feet, surpassing the Burj Khalifa by 20 million square feet.

What is the significance of the domes at Starbase?

The domes at Starbase are climate-controlled structures designed to house the development of the Starship spacecraft, rockets, and equipment. They are part of the larger Terrafab project and serve as a prototype for future Martian habitats, which will need to withstand the harsh Martian climate.

When will Terrafab be completed and when will it be used to ship people to Mars?

The exact completion date for Terrafab is not specified, but it's clear that SpaceX is working to accelerate the development. Elon Musk has said that SpaceX plans to begin shipping people to Mars in the mid-2020s, so the infrastructure, including Terrafab, will need to be ready by then.

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