All3 raises $25M to automate construction with AI design and autonomous legged robots

London-based startup All3 has raised $25 million in seed funding to revolutionize construction using AI-powered design software and autonomous legged robots, targeting the industry's chronic inefficiencies in cost, time, and labor. Led by RTP Global, the round will enable All3 to scale its end-to-end platform across construction sites, particularly in Germany, where it has already processed designs for over 100,000 square meters of residential projects slated for 2026-2027. As reported by The Next Web, All3 aims to replace the traditional construction value chain—from architect's brief to move-in-ready buildings—with a vertically integrated system that developers can plug into for everything beyond site selection, permits, and financing.

At the core of All3's technology are three interconnected components. First, an AI-powered design platform that generates fully compliant building plans from a simple brief or site address, optimizing for space, local regulations, and robotic production. Second, compact robotic factories that produce custom timber composite components—like walls, beams, and columns—with 0.2mm precision, eliminating the need for manual programming. Third, the flagship Mantis robot: a legged, autonomous machine with a 100kg payload and 4-meter reach, designed specifically for on-site tasks such as placement, fastening, finishing, and inspection, as detailed in coverage from The Robot Report and All3's own announcements.

The company claims its approach delivers significant gains: up to 30% cost savings, 50% faster timelines, and 25% less embodied carbon compared to conventional methods, based on its internal modeling. These promises address construction's status as the world's largest industry by value—yet one of the least automated—plagued by labor shortages, subcontractor handoffs, and delays. All3's first building is set to break ground in Europe during the second half of 2025, marking a practical test of its claims, according to Tech.eu and Housing Digital.

Founded to tackle what CEO Rodion Shishkov calls "long-considered unsolvable" challenges, All3 differentiates itself through purpose-built robotics trained via reinforcement learning, capable of handling the chaos of live sites rather than controlled factory settings. This vertical integration promises scalable, customized multifamily housing at the price of standardized builds, potentially easing housing shortages while boosting sustainability and affordability. As The AI Insider notes, the funding validates All3's platform for automated design, manufacturing, and assembly, positioning it to disrupt an sector ripe for innovation.

Stakeholders from developers to urban planners stand to benefit, with implications for faster housing delivery in high-demand areas like inner-city brownfield sites. Next steps include deploying the Mantis robots and expanding its German pipeline, though independent audits of performance claims remain pending. If successful, All3 could set a new standard for construction productivity amid growing labor constraints and climate pressures.