All3 Raises $25M Seed to Transform Construction with Autonomous Legged Robots

London-based construction robotics startup All3 has raised a $25 million seed round led by RTP Global, with participation from SuperSeed, Begin Capital, s16vc and VNV Global.

The Mantis platform integrates AI-powered design software with robotic factories that produce custom building components. Early deployments are planned for active construction sites in Germany, targeting the country acute shortage of approximately 700,000 homes.

All3 claims its integrated approach can achieve cost savings of up to 30%, timeline reductions of up to 50%, and up to 25% less embodied carbon compared to traditional construction methods.