Insider Brief
- All3 raised $25 million in seed funding led by RTP Global to scale its AI and robotics platform for automated building design, manufacturing and on-site construction.
- The company uses AI to design buildings for specific sites, robotic factories to produce custom components like walls and beams, and autonomous robots to assemble them on-site, which it says can cut development time by up to 50%, reduce costs by up to 30% and lower carbon impact by up to 25%.
- Its Mantis robot handles installation, fastening, finishing and inspection with embodied AI, carrying more than 100 kilograms and reaching up to four meters, with All3 saying a fleet of Mantis robots can complete a seven-story, 5,000-square-meter building in about three months.
UK construction robotics startup All3 has raised $25 in seed funding led by RTP Global.
All3 is developing an integrated construction platform built around autonomous robots that assemble buildings on-site, AI systems that design building components and robotic factories that manufacture those parts before they reach the job site.
According to All3, its goal is to help developers build housing faster, cheaper and with less dependence on scarce skilled labor.
“Construction has been one of the slowest industries to change,” RTP Global pointed out in the announcement. “The methods, the processes, and the productivity have barely improved in the last 50 years. The way buildings get built today looks remarkably similar to how they were built then.”
The company uses AI to help create building designs tailored to a specific site, including difficult urban plots, while robotic factories produce custom parts like walls, beams and columns off-site. Those parts are then assembled on-site using mobile robots with interchangeable tools rather than multiple single-purpose machines. All3 says this approach can cut development time by up to 50%, reduce costs by up to 30% and lower carbon impact by up to 25%, while making it easier to deliver sustainable housing at scale.
Part of All3’s platform is Mantis, a four-legged autonomous construction robot designed to handle installation, fastening, finishing and inspection across the full building process using embodied AI and interchangeable tools. Mantis can carry more than 100 kilograms, reach up to four meters and use plug-and-play connectors to assemble building components with millimeter-level precision, allowing a fleet of robots to complete a seven-story, 5,000-square-meter building in about three months while cutting project timelines by up to 50%.
The company announced in June 2025 it had received $30 million in funding from its founding team at that point. In July the company said it had expanded operations to Germany.
