First Approved 3D-Printed Home in Los Angeles County Completes Wall Construction

en.Wedoany.com Reported - PCI Builders, a California-based construction contractor, has confirmed that the first 3D-printed concrete home in Los Angeles County to obtain local building permits has completed wall printing construction. The project is located in Altadena, an area affected by the 2025 Eaton Fire. Construction is led by PCI Builders, with RIC Robotics and Stone River Dynamics participating in the 3D concrete printing work. Plumbing and electrical work are currently undergoing inspections, roof trusses have arrived on site, and subsequent construction is still underway.

The residence has a floor area of approximately 1,500 square feet, or about 139 square meters, and features a Spanish-style architectural design, including arched window openings, sills, and lintels. The project uses robots to extrude concrete layer by layer to build the walls, with RIC Robotics and Stone River Dynamics each completing portions of the printing work. The construction team adjusted the printing paths and equipment operation plans according to the architectural design, preserving the complex wall configurations in the original plan.

The project uses RIC Robotics' RIC-M1 and Stone River Dynamics' Sidekick concrete printing equipment. The RIC-M1 has a maximum working space of approximately 8.99 meters long, 6.00 meters wide, and 2.99 meters high, with a maximum printing speed of approximately 48 millimeters per second. The Sidekick features a compact, lightweight design and is primarily used for printing tasks that require flexible equipment positioning on the construction site and handling of localized complex configurations.

The residence obtained its building permit from Los Angeles County in February 2026. The project uses specialized concrete material to print structural walls layer by layer, combined with traditional construction methods to complete the roof and other works. The construction plan published by PCI Builders uses concrete printing material supplied by Sika, with the subsequent roof structure configured with steel trusses and fire-resistant roofing materials. The project also plans to install a waterless sonic fire suppression system developed by Sonic Fire Tech as a supplement to the building's fire protection facilities.

The homeowner, Cindy Lopez, had her original home destroyed in the 2025 Eaton Fire. During the design and permitting process, the project team coordinated with Los Angeles County authorities regarding the construction methods, structural design, and on-site inspection requirements for the 3D-printed walls. The concrete wall printing for the residence has been completed, but the roof, mechanical and electrical installations, and related inspections have not yet been fully completed.