All3 Raises £18.5m Seed to Bring Robots to Building Sites

What All3 is building

All3 is developing three interlocking products: an autonomous legged robot designed for on-site assembly, AI-powered design software, and robotic factories capable of producing custom building components, according to the company's announcement. The aim is to cover the construction workflow from digital design through to physical fabrication and installation.

The company maintains offices in London, Belgrade, Berlin and Zug, as reported by UKTN. The new capital will primarily fund research and development operations in the UK and Serbia.

Rodion Shishkov, co-founder and chief executive of All3, framed the ambition in broad terms.

"We started All3 to develop robotics and AI solutions that can be deployed to fix construction's existential problems. This seed round validates that we're positioned to solve a problem historically considered impossible."

Jelmer de Jong, a partner at lead investor RTP Global, pointed to what he described as "encouraging early demand" and said the firm expects "the first building break ground this year," according to the company's announcement. Other investors in the round include SuperSeed, Begin Capital, s16vc and VNV Global.

Why the round is unusually large for a UK seed

At £18.5m, the All3 raise sits well above the typical UK seed round. Beauhurst data indicates the median UK seed round for deep-tech and hardware startups has hovered between £1m and £3m in recent years. Even adjusting for inflation and a modest upward trend, the All3 figure is roughly six to ten times the median, placing it in a narrow band of outsized early-stage bets.

That scale matters because construction robotics is capital-intensive. Developing, testing and iterating physical hardware, particularly autonomous legged robots that must operate on unstructured building sites, burns cash far faster than pure software development. Materials, sensors, actuators and safety certification all carry costs that a typical SaaS seed round never encounters.

The multi-country operating model adds a further layer of overhead. Running R&D across London and Belgrade may offer access to lower-cost engineering talent in Serbia, but it also introduces coordination complexity, regulatory variation and currency exposure for a startup that has not yet disclosed revenue.

Whether £18.5m is enough to move from prototype to repeatable commercial deployment remains an open question. For comparison, US-based Hadrian, which builds robotic factories for aerospace manufacturing, raised $117m in a Series B in 2023, according to Crunchbase data. Construction Robotics, also US-based, and Barcelona's Scaled Robotics have pursued narrower product scopes, focusing on single tasks such as bricklaying or quality scanning rather than the full-stack approach All3 is attempting.

All3's breadth of ambition, spanning design software, on-site robots and off-site factories, is distinctive. It is also expensive. Operators evaluating the technology will want to see which of those three product lines reaches commercial readiness first.

Construction's productivity problem in numbers

The underlying thesis behind All3 and its competitors is well supported by data. Office for National Statistics figures show that output per hour in UK construction has been broadly flat for two decades, even as manufacturing and services have posted steady gains. Between 2000 and 2024, construction labour productivity grew by less than 10% in real terms, according to ONS estimates, compared with roughly 30% for the whole economy.

Labour shortages compound the problem. The Construction Industry Training Board has repeatedly warned that the sector needs to recruit hundreds of thousands of additional workers over the coming decade to meet housing and infrastructure targets. An ageing workforce and post-Brexit migration shifts have tightened the labour pool further.

Shishkov described construction as "the largest global sector yet to experience a productivity revolution, representing a trillion-dollar opportunity," according to the company's statement. The characterisation is not unusual in construction-tech fundraising materials, but the underlying productivity data does support the premise that the sector has been slow to adopt new methods.

What operators should watch for

For housebuilders, commercial developers and tier-one contractors, the practical questions around construction robotics remain pointed.

Site readiness is the first concern. Autonomous robots designed for factory floors operate in controlled environments. Building sites are unstructured, weather-exposed and constantly changing. Whether All3's legged robot can navigate real-world site conditions at scale has not been publicly demonstrated.

Integration with existing workflows is a second challenge. Construction supply chains are fragmented, with dozens of subcontractors on a typical project. A robotics system that requires bespoke site preparation or specialist operators may struggle to fit into established procurement models.

Regulatory and insurance frameworks present a third consideration. UK building regulations, CDM (Construction Design and Management) requirements and site insurance policies were not written with autonomous robots in mind. Any deployment at scale will require engagement with the Health and Safety Executive and insurers.

RTP Global's de Jong noted that the team's approach pairs "cutting-edge robotics and physical AI with a working model," according to the company's announcement. The phrase "working model" suggests a technology that has been demonstrated but not yet deployed commercially at volume.

All3's seed round is large enough to fund meaningful R&D and early pilot projects. Whether it is sufficient to bridge the gap between prototype and a commercially viable product, across three product lines and four countries, is the question that the next twelve to eighteen months should begin to answer.