Lib Work Earth House Model B, a residential building designed by Lib Work in Kumamoto, has introduced additive manufacturing with soil as a viable construction method for residential living environments as of August 27, 2025. Developed in collaboration with Italian company WASP, the house was built using the Crane WASP 3D printing system. The structure spans 100 square meters and is the first completed residential project in Japan to utilize locally sourced soil and cement-free materials. Designed as a functional home, it includes a kitchen, bedroom, bathroom, and living room. Environmental sensors are embedded in the walls to track temperature, humidity, and condensation in real time. This provides data on how unstabilized earth performs under Japan’s humid climatic conditions. Solar panels combined with Tesla’s Powerwall provide complete electrical independence, aligning the house with energy autonomy and circular economy principles. The construction system, originally launched for experimental use in 2018, has now proven viable for permanent, full-time residences. The project offers a model for seismic regions where sustainable building techniques are needed. WASP founder Massimo Moretti emphasized the project as an example of international cooperation driving ecological innovation in the construction sector.
Lib Work Earth House Model B presents a shift in digital construction by combining traditional earthen materials with 3D printing technologies in a region where seismic resistance, ecological responsiveness, and material efficiency are central. The structure adopts a monolithic configuration shaped entirely through additive manufacturing using soil without stabilizers or cement. This method enables direct integration of spatial form and structural logic, while addressing climate-specific thermal regulation through passive means. The printed geometry follows a continuous path of material deposition, producing walls with both mass and texture that respond to environmental conditions without requiring additional insulation.
Developed by Japanese construction firm Lib Work, the house is located in Kumamoto and was completed using the Crane WASP 3D printer, a modular system engineered by Italy-based WASP (World’s Advanced Saving Project). First introduced during the Gaia prototype in 2018, the system has since evolved into a scalable, open-source solution for architectural-scale printing. In this case, the printer was used to build a 100 square meter home entirely from soil sourced on site, demonstrating regional material circularity. No Portland cement or synthetic binders were used, reducing embodied carbon and enabling future reuse of all materials.
The house accommodates standard residential functions, including a bedroom, bathroom, kitchen, and living space. Sensor systems integrated within the wall structure allow real-time monitoring of internal temperature, humidity, and condensation. These features position the building as both a research tool and a habitable prototype, generating long-term data on the environmental performance of earth construction in Japan’s humid climate.
Photovoltaic panels and Tesla’s Powerwall battery system provide full energy autonomy. The system stores electricity generated during daylight hours, allowing the home to operate independently of the municipal grid. This renewable integration is consistent with circular economy models, reducing both operational emissions and dependency on centralized energy infrastructure. The combination of natural material construction and off-grid capability defines a resilient housing strategy adaptable to both environmental and social shifts.
Crane WASP technology allows architectural teams to use earth as a digitally controlled construction medium, bypassing energy-intensive material processing. Its layered fabrication method gives control over wall thickness, curvature, and surface expression, while ensuring structural cohesion. By applying this system in Kumamoto, Lib Work demonstrates how local materials and parametric processes can coalesce into a viable residential typology for Japan and comparable contexts.
WASP founder Massimo Moretti stated, “We heartily congratulate the Lib Work team for their wonderful interpretation of combining 3D printing with natural materials. I am honored to collaborate with organizations like Lib Work that share our vision of fusing technology, natural materials, and sustainability. This is a concrete example of international cooperation and cultural exchange contributing to a more sustainable and conscious future.”
Lib Work Earth House Model B arrives at a moment when Japanese housing policy is beginning to respond to new material strategies and digital building methods. As regulatory frameworks adjust, this project offers a high-clarity precedent for additive construction using raw earth. The building’s realization underscores how soil, when supported by digital precision and environmental intelligence, can operate as a primary material for contemporary, climate-responsive architecture.
