Horizon Legacy Prints 26-Unit Townhome Development in Canada

Horizon Legacy, a Toronto-based construction company, has finished a 26-unit townhome development in Gananoque, Ontario, using on-site robotic 3D printing. The units are complete and move-in ready. A second 30-unit project is now printing near Brantford.

The company calls it the first and largest housing development in Canada using on-site robots. That claim rests less on the printing itself and more on the scale: two machines ran on site, producing the full wall systems for more than two dozen homes in a single campaign.

Nhung Nguyen, CEO of Horizon Legacy, said the approach cuts framing labor but does not yet beat conventional construction on total cost or schedule. "Printing is not currently the cheaper route," she said. That honesty is rare in an industry saturated with claims about 3D printing solving the housing crisis overnight.

The process uses a mobile fleet of concrete-laying robots called VAL. The machines extrude a fast-setting concrete mix that reaches about 80 percent strength in seven days. Traditional concrete takes roughly 30 days to cure fully. The faster set lets the robots support subsequent layers without waiting for the material to harden.

Curves cost the same as straight lines. That is one of the practical advantages the company emphasizes. Conventional formwork gets expensive when walls deviate from rectangles. With additive manufacturing, complex geometry comes at no premium. The Gananoque homes reflect that: rounded shapes and varied facades that would have driven up labor costs with traditional methods.

The robot needs a fraction of the rebar a conventional concrete wall requires. Operators still place steel reinforcement at key points, but the material's strength means less of it. Three people managed the printing process using digital tablets, replacing the six-person crew a conventional pour would need for the same wall area.

Horizon Legacy is not selling printers. It is selling construction as a service. The company brings the robots to the jobsite, runs the print, and hands off to local trades for the roof, windows, wiring, and finishes. That model avoids the capital expense of buying equipment and the logistical headache of shipping large modules from a factory.

The next project near Brantford will push the technology to three stories. Nguyen said the company believes the method can scale to ten stories, though it has not built that high yet. Training new operators takes less than six months, far shorter than the two to five years typical for construction apprenticeships. The team includes people from aerospace, architecture, and gaming backgrounds.

Insurance and financing remain hurdles. Many insurers are unfamiliar with 3D-printed walls and reluctant to write policies. Appraisers lack comparable sales data. Those are solvable problems, but they require more completed buildings and time. Horizon Legacy's approach is to prove the concept one project at a time rather than promise a revolution.