California’s First Robot-Built Fire-Resistant Accessory Home

3D construction printer robot arm laying concrete walls in Muscatine, Iowa in mid-2023. Courtesy of Ziyou Xu of RIC Technology

Construction began in early February in Walnut, California on the state’s first fire-resistant, on-site 3D-printed concrete accessory dwelling unit (ADU), according to the construction company.

The home will feature non-combustible concrete walls and a steel roof with Sure-Board material, which is non-combustible roof sheathing.