Monumental raises $32M Series B to scale bricklaying robots

Construction has resisted the productivity gains that transformed factories and warehouses, and a Dutch startup is now attracting serious growth capital on the bet that on-site robotics can finally change that.

Amsterdam-based Monumental has raised a $32 million Series B led by Khosla Ventures, with existing backers Plural and Hummingbird returning, tech.eu reported. The round follows a $25 million raise co-led by Plural and Hummingbird in February 2024, per corroborating coverage.

What the company actually does: it fields a fleet of small, self-driving bricklaying robots that show up on active sites and lay walls. That fleet now numbers more than 150 machines, and Monumental says they have completed over 100 homes, plus a school, a community centre, a hotel and canal walls across the Netherlands and the UK. Nearly half of the finished homes were built in the past three months, which reads as evidence the deployment curve is bending up rather than a hedge.

The commercial model is the more interesting part. Contractors do not buy the robots; they pay for completed walls, an outcome-based service that puts machine reliability, calibration and site conditions squarely on Monumental. Co-founder and CEO Salar al Khafaji framed the round around capacity, saying "every robot we deploy expands the industry's capacity to build." The proceeds go to a US launch targeting Texas, Florida, Virginia and Arizona, according to Fortune's coverage, plus a dedicated UK country manager and expanded task capabilities for the fleet.

The honest caveat is that the reporting does not disclose revenue, gross margin per wall, robot uptime, cycle time versus a human crew, or defect rates. Outcome-based pricing looks pretty on a deck and unforgiving on a rainy Tuesday, and 150 robots is still a rounding error against the 349,000 net new workers Fortune says US construction needs in 2026 alone. What the round does buy is a shot at answering the harder question: whether a robotics vendor can compound like a software company when every unit of growth means more steel, more service trucks and more site variance to price into the quote.