London start-up – All3 – has raised $25m in a seed funding round. The company aims to replace the entire construction value chain, from the architect’s brief to move-in-ready buildings, by using AI and a purpose-built on-site robot called the ‘Mantis’.
The seed round was led by RTP Global, whose portfolio includes Datadog, Delivery Hero, and SumUp, with significant participation from SuperSeed and additional investment from Begin Capital, s16vc, and VNV Global. In addition, Jelmer de Jong, Partner at RTP Global, has joined the All3 board.
All3 was founded by Rodion Shishkov, an entrepreneur with a background in industrial robotics and retail logistics. The company operates across Europe with offices in Berlin and Zug and R&D facilities in London and Belgrade. It rose from stealth in mid-2025, where it had already begun testing its robotic system in Belgrade.
All3’s pitch rests on vertical integration – in contrast to startups that sell one piece of the construction puzzle to builders who still manage the rest. The company is lining itself as an end-to-end replacement for the traditional construction value chain.
The company’s system has three integrated components. Firstly, an AI-powered design platform which translates a brief or site address into a fully compliant building design, streamlining for space, local planning regulations, and robotic production constraints.
Secondly, it has robotic factories, which All3 describes as compact, modular production cells, that fabricate custom timber composite components with approximately 0.2mm precision. This also negates the needs for programmer intervention.
Lastly, it contains the All3 Mantis – an autonomous legged robot holding a 100kg payload and four metre reach, purpose-built for on-site assembly, covering placement, fastening, finishing and inspection.
The choice of material is deliberate. All3 builds in structural timber composites, a renewable material which stores CO₂ rather than emitting it during production. Unlike concrete which accounts for around 7% to 8% of global carbon emissions.
The company alleges that its approach provides cost savings of up to 30%, timeline reductions of up to 50%, and up to 25% less embodied carbon in contrast to conventional construction. These numbers have been drawn from its own modelling and marketing materials, but have not been independently audited at this stage.
The funds raised will be used primarily to advance R&D in London and Belgrade and deploying the robot fleet across All3’s first commercial projects in Germany, the company’s initial launch market. A first building is expected to break ground later in 2026.
All3 has processed over 100,000 sqm of residential projects through its AI design platform, forming the basis for its construction pipeline in Germany for 2026 to 2027. The company comments the progress is reflective of genuine customer engagement rather than internal modelling.
