PCI Builders prints first 3D concrete structure after LA County permit approval

PCI Builders has printed its first 3D concrete structure after securing Los Angeles County’s first approved permit for a 3D concrete printed home. The Monrovia firm says the project in the Eaton Fire rebuild zone shows how code-compliant 3D printing could speed up resilient housing in wildfire-prone California communities.

Why it matters: - PCI Builders’ first printed structure turns 3D concrete printing from a pilot concept into an approved residential building method in Los Angeles County. - The project is in the Eaton Fire rebuild zone, where faster, stronger and more fire-resilient housing has immediate practical value. - The company is positioning 3DCP as a path to homes that are more durable, more energy efficient and better suited to California’s wildfire, drought and seismic risks.

What happened: - PCI Builders, a woman-owned design-build firm based in Monrovia, printed its first 3D concrete structure after receiving Los Angeles County’s first approved building permit for a 3D concrete printed home. - The permit was issued in late February for a residence in the Eaton Fire rebuild zone. - CEO and founder Allison Allain said the milestone reflects a push to build homes that are stronger, safer and more insurable in high-risk communities. - PCI Builders is using Sika’s 3D concrete printing technology, including the Sika 3DCP Sikacrete mix and related processes.

The details: - 3DCP uses a large computer-controlled system to print structural concrete walls layer by layer from a digital design. - PCI Builders says the interior and exterior walls of a 1,500-square-foot home can be printed in roughly 1 to 2 weeks. - Mechanical, electrical and plumbing systems are integrated into the construction process. - The company says its approach pairs non-combustible concrete wall systems with fire-resistant metal roofing. - PCI Builders says the system is engineered for seismic-rated performance in California’s earthquake zones. - The company says the method can reduce long-term maintenance costs and deliver up to twice the energy efficiency of traditional stick-built homes. - The walls are designed to resist mold, water and pests. - Exterior finishes can be hand-troweled for a stucco look or upgraded with premium coatings. - PCI Builders says its system aims for near 90-degree corners, avoiding the rounded profiles common in many printed systems. - The process produces monolithic walls without cold joints, which PCI Builders says improves structural integrity and seismic resilience. - Allain said she began researching construction technologies the day after the fires to help prevent similar damage for clients and the local community. - PCI Builders says it is preparing to install prototype Sonic Fire Tech interior suppression systems in its first two homes. - Sonic Fire Tech uses sound waves to combat flames without water or chemicals and is still moving through the approval process.

Between the lines: - The permit matters as much as the printed structure because code approval is often the barrier between innovation and real housing production. - PCI Builders is using a wildfire recovery project to make a broader case for rebuilding with new materials and methods, not just replacing what burned. - The company is also linking construction tech with resilience tech, which suggests it wants to sell a full safer-home package rather than a single building system. - The woman-owned branding and local roots reinforce PCI Builders’ positioning as a regional builder with a technical edge.

What’s next: - PCI Builders plans to bring the 3DCP system across Los Angeles County and Southern California. - The company is preparing the first two homes for prototype Sonic Fire Tech installations. - PCI Builders says the next phase is proving that permitted, code-compliant 3D printed homes can scale into mainstream residential rebuilding.

The bottom line: - PCI Builders is trying to show that 3D concrete printing is no longer experimental in Southern California — it is now a permitted construction path for resilient housing.