You can build this fireproof dome home in exactly one week, for a fraction of the cost of a normal house. It survives earthquakes, repels pests, and won't burn.

It's made of Aircrete—a DIY mix of cement and dish soap foam that traps millions of tiny air bubbles to create lightweight, indestructible blocks.

It sounds like the ultimate cheat code to the housing crisis. So why is it practically illegal to build one?

The truth isn't that Aircrete is dangerous. It's that the system wasn't built for it. From outdated local building codes that only understand wood and drywall, to a trillion-dollar construction industry that doesn't want you pouring your own cheap walls, getting a dome approved is an absolute nightmare.

Here is exactly how these week-long builds work, and the hidden reasons city planners keep shutting them down.

So let's get into it. What exactly is Aircrete, and why does something this simple have people convinced it could fix the housing crisis?

At its core, Aircrete is not some rare, patented material you need a factory to produce. It's just three ingredients you can buy at any hardware store. Portland cement, water, and a foaming agent. That foaming agent can be a commercial concentrate designed for lightweight concrete, or in its most DIY form, plain dish soap run through a small air compressor and a foam generator built out of PVC pipe.

Here's the trick. You whip that soap and water into a shaving-cream-like foam, almost like a bubble bath on steroids. Then you fold that foam into a cement slurry. The foam doesn't dissolve. It survives the mixing process and gets locked into the cement as it cures, leaving behind millions of microscopic air pockets suspended evenly throughout the material. The result is a block or wall that can be one third, or even one tenth, the density of standard concrete, while still holding its shape and strength.