Inside the California neighborhood built entirely by robots — as first homes go on the market

A California startup says it has officially completed its first fully 3D-printed home, marking a futuristic step toward what could be a faster — and cheaper — way to build housing in the Golden State.

The company, 4DIFY, announced the milestone in February, saying the home proves that robotic construction technology can move “from concept to completion” under real-world regulations and conditions.  

Instead of traditional wood framing and teams of construction workers, the house was built using industrial-scale 3D printers that layer concrete inch by inch, forming the walls of the structure with automated precision.  

The project is part of a small experimental neighborhood in Yuba County, north of Sacramento, where developers are building a cluster of five homes using the cutting-edge technology.  

The roughly 1,000-square-foot home took just 24 days to print, Nan Lin, 4Dify’s founder, reported to CBS News — dramatically faster than the months or years it can take to construct a typical house in California.  

Developers say automation can slash construction timelines, reduce labor costs and limit material waste–potentially making housing more affordable in a state grappling with housing shortages.

The technology used by 4DIFY comes from the company SQ4D, whose robotic “ARCS” printer is designed to fabricate full-size concrete structures with minimal manual labor.  

The homes aren’t just quick to build–developers claim they’re also tougher than conventional houses. Because the structures are made largely from concrete, the walls are designed to be fire-resistant, mold-resistant and pest-resistant, and may even lead to lower insurance costs.  

While the first house took 24 days to print, the team expects future builds to take as little as 10 days.

“We are already preparing to print additional homes on the same site, applying what we’ve learned to improve efficiency, coordination, and speed,” 4Dify said on its site. “Each build strengthens our process and brings us closer to scalable, repeatable deployment.”

Each home in the project is expected to sell below the local market rate, thanks to savings in labor and materials. The first property is already listed for $375,000, according to reports.