Monumental— Autonomous robot fleets for on-site bricklaying.

Monumental builds and operates compact autonomous robots that lay brick and mortar on live construction sites. Its Atrium software coordinates fleets from a digital model, and the company sells finished masonry work as a subcontractor rather than selling robots.

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Founded
2021
Headquarters
Amsterdam, Netherlands
Legal name
Monumental B.V.

Highlights

Notable milestones from Monumental’s journey — funding rounds, launches, and other moments worth knowing.

funding

$32M Series B backs US expansion after 100+ homes

Khosla Ventures led the round, taking total funding to $59M. Monumental said its fleet had built more than 100 homes plus a school, community center, hotel and canal walls across the Netherlands and UK; the capital funds more European deployments, a US launch and a wider range of construction work.

Round
Series B
Raised
$32M
Led by
Khosla Ventures
Monumental co-founders Salar al Khafaji and Sebastiaan Visser standing in the company's Amsterdam robot workshop.
Co-founders Salar al Khafaji and Sebastiaan Visser with Monumental's construction robots.
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milestone

A robot fleet runs a 36-hour nonstop build

Monumental kept its robots laying brick for 36 hours straight on a transformer-substation project with Waal, its first continuous day-and-night build. The same job also produced the fleet's first soldier courses, adding upright bricks to its supported masonry patterns.

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milestone

Five robots complete all brickwork for an eight-home block

A five-robot fleet laid every brick, including the corners, for eight homes at Kreekrijk in Assendelft. Monumental and masonry partner Koedooder described it as the first housing block fully brick-laid by robots.

A Monumental robot laying red bricks along a row of new homes at the Kreekrijk construction site.
Five robots worked together across the eight-home block at Kreekrijk.
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partnership

A three-robot crew lays walls at a live healthcare project

At SEIN's new epilepsy and sleep-medicine activity center in Cruquius, the bricklaying robot worked from the building's digital 3D model while two autonomous vehicles supplied mortar and bricks. The pilot put Monumental's coordinated fleet into an active build with contractor Pellikaan.

A Monumental bricklaying robot placing light-colored bricks along an insulated wall at the SEIN construction site.
The SEIN pilot paired one bricklaying robot with two autonomous supply vehicles.
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funding

Emerged from stealth with $25M for autonomous bricklaying

After two and a half years in stealth, Monumental showed a compact three-robot system: brick and mortar carriers feeding an autonomous bricklayer that navigates ordinary construction sites. Plural and Hummingbird co-led the round to scale manufacturing, deployments and supported masonry tasks.

Raised
$25M
Led by
Plural, Hummingbird
A compact Monumental bricklaying robot with twin vertical masts and two articulated tool arms.
Monumental designed its robots to fit ordinary construction sites rather than requiring factory-like conditions.
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team

Silk's founders reunite to automate construction

Salar al Khafaji and Sebastiaan Visser founded Monumental in Amsterdam after building data-visualization startup Silk, acquired by Palantir in 2016. They chose a vertically integrated stack of robot hardware, software and machine vision, operated as a masonry subcontractor.

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