Monumental, the Amsterdam-based construction robotics company behind an autonomous bricklaying fleet coordinated by its Atrium AI platform, has raised a $32 million (€27 million) Series B led by Khosla Ventures with participation from existing backers Plural and Hummingbird. The round bankrolls a step-change in deployments and the company's first US pilots.
Robots As Autonomous Subcontractors
Monumental now operates more than 150 electric robots on live construction sites across the Netherlands and the UK. Rather than selling the machines, it deploys them as autonomous subcontractors and charges general contractors for finished walls. The fleet has helped build more than 100 homes, a school, a community centre, a hotel and canal walls; nearly half of those homes were completed in the past three months, a signal that the pay-for-walls commercial model is starting to scale.
Atrium Is The Real Product
The company's technical moat sits in Atrium, an AI stack that fuses computer vision, sensor fusion and localisation to lay bricks and mortar with millimetre precision. Co-founders Salar al Khafaji and Sebastiaan Visser, who previously built Silk before its 2016 acquisition by Palantir, are pointing the Series B at growing the engineering team, widening the range of construction tasks the robots can perform, and standing up a UK country manager and a dedicated US pilot programme.
A Hot Segment For Robotics Capital
The round lands in the middle of a construction-robotics capital wave. Only two days earlier, TerraFirma closed a $115M Series A for semi-autonomous heavy-equipment robots, and Buildroid AI has been pushing model-based bricklaying robots into US sites. Robotics startups pulled more than $18.8 billion in H1 2026 alone, and physical-AI outlays for the built environment are looking like one of the fastest lanes.
Reporting based on coverage from Tech.eu, Tech Startups and Sifted.