The London-founded startup wants to replace the entire construction value chain, from architect’s brief to move-in-ready building, using AI and a purpose-built on-site robot called the Mantis. Construction is the world’s largest industry by value and one of its least automated. A typical building project today involves roughly the same sequence of hand-offs, on-site labour, and bureaucratic bottlenecks that it did half a century ago. Productivity in the sector has barely improved in 50 years, even as manufacturing, logistics, and services have been transformed by software and automation. That stagnation is what All3 was built to end. The European construction robotics startup today announced a $25 million seed funding round. The round is led by RTP Global, the early-stage firm whose portfolio includes Datadog, Delivery Hero, and SumUp, with significant participation from SuperSeed and additional investment from Begin Capital, s16vc, and VNV Global.…