When Czech playwright Karel Capek coined the term “robot” in 1920, he could scarcely have imagined that just a century later, the artificial beings he imagined enslaving would be helping us with everything from vacuuming our floors to reconstructing historic monuments.

While humanoid builders are still a long way off, automation driven by breakthroughs in robotics and artificial intelligence has already become a cornerstone of 21^st-century construction. A new generation of autonomous machinery is beginning to redefine what it means to erect resilient infrastructure.

One of the latest breakthroughs is aerial additive manufacturing (AAM)—or airborne fabrication, as researchers at Imperial College London have dubbed it. Their approach relies on coordinated fleets of drones that deposit building materials layer by layer. The process mirrors the mechanics of a 3D printer, yet dispenses with fixed scaffolding altogether.

In a study published in Science Robotics, the team demonstrated that drone swarms can autonomously build expanded polyurethane structures several metres high, working in perfect coordination without direct human intervention during the build.

The most obvious application lies in hard-to-reach environments, such as flooded zones or areas devastated by natural disasters, where erecting scaffolding or deploying conventional machinery is either impossible or highly dangerous. Even so, initial efforts are focusing on repairing and retrofitting existing built environments—a vital first step before larger-scale deployment.

One of the laboratories trialing this ambitious transformation is the DroneHub at EMPA (the Swiss Federal Laboratories for Materials Science and Technology). Here, researchers from Imperial College have spent years testing drones capable of autonomously inspecting structures, detecting cracks, and applying repair materials. Ensuring these drones neither fall nor collide with one another mid-operation is an engineering feat worthy of its own feature article.

Program director Mirko Kovac sums up the vision with a striking analogy: his goal is for drones to act as an immune system for buildings, intervening with surgical precision to fix damage before it escalates into a major problem. In his own words, “robotics could redefine maintenance, inspection, and repair practices across the built environment, tackling critical challenges in biodiversity protection and climate change mitigation while reducing human risk.”

In 2021, the American firm ICON built the first entirely 3D-printed residential neighborhood in Austin, Texas, using its Vulcan system, completing each house in just one to two days.

In Europe, the BOD project in Denmark holds the title of the first multi-storey building constructed using this method. The value of these systems extends far beyond speed; printing optimizes material usage by depositing exactly what is required at each structural point, reducing construction waste to absolute minimums compared to conventional methods.

Moreover, there remains substantial room for improvement. The latest research is targeting the development of printable materials that are far more sustainable than standard concrete, using experimental mixes that bolster structural strength and accelerate curing times.

Laying bricks is a task that demands rigorous precision, steady rhythm, and immense physical stamina. Hadrian X, developed by the Australian company FBR, has spent years taking on exactly that burden. The system features a 32-metre telescopic arm mounted onto a truck, capable of laying up to 300 blocks per hour by following a 3D digital model of the structure.

This constant cross-referencing allows crews to flag structural deviations, moisture issues, or execution flaws long before they turn into severe, costly defects. On large-scale sites where the inspection area spans entire hectares, these robots do not replace human technicians; instead, they expand their decision-making capacity by gathering data, generating reports, and highlighting exactly where to look.

Human professionals remain the ones who interpret the data, make the calls, and take action. The difference is that they reach that decision point armed with insights that were previously impossible to obtain without spending days surveying the site on foot.

A separate school of thought relies on a different approach: rather than bringing robots to the construction site, this approach brings the construction site to the robots. This is the driving principle behind modular housing micro-factories—genuine assembly lines where industrial robots, akin to those used in the automotive sector, assemble complete residential modules within controlled indoor environments.

Companies like the British firm Automated Architecture have spent years refining this model, with the ultimate goal of establishing a distributed global network of these factories. Transported inside standard shipping containers, these facilities operate with an efficiency powered by next-generation software that adapts diverse architectural designs to the logic of mass production.

The benefits are undeniable. Shifting construction into compact factories eliminates weather dependencies, standardizes build quality, and allows for far more precise logistical planning. Modules arrive on-site fully finished—utilities and installations included—requiring nothing more than final assembly in situ.

Any technology that allows us to build more with less is no longer just an operational upgrade; it is a necessity. The automation made possible by modern robotics points precisely in that direction. Karel Capek would be proud.

Sources:

• Science Robotics
• EMPA
• ICON – 3D printed housing
• FBR – Hadrian X
• AUAR