HKU Designs 2026 Underground House with 3D-Printed Earth Vaults

Ancient Techniques and Thermal Benefits

Across China's Loess Plateau, the dikengyuan represents a centuries-old approach to construction where entire homes are excavated several meters into the earth. These dwellings feature courtyards dug into the ground, with vaulted rooms carved directly from the surrounding geological mass. This method naturally integrates the earth as exterior walls and roofing.

A primary advantage of this construction is the thermal mass provided by the soil, which changes temperature slowly. This characteristic allows underground interiors to remain more stable, buffering against significant temperature swings common during hot summers and cold winters.

Similar principles are applied in excavated homes found in Matmata, Tunisia, and the cave houses of southern Spain, highlighting the global application of earth as a natural climate regulator.

Modern Material Integration and Design

Contemporary architectural projects are revisiting these subterranean concepts with advanced materials. The University of Hong Kong's "Underground House of the Future," completed in Henan in 2026, exemplifies this by reinforcing existing earthen chambers with brick vaults.

This project also introduced skylights and rear openings to enhance natural daylight penetration deep within the structure. The central courtyard was redesigned as a stepped communal space, covered by a translucent canopy.

Furthermore, the integration of digital fabrication is evident through the use of 3D-printed earthen elements, merging traditional excavation with modern construction techniques. Another example, Javier Senosiain's 1985 Organic House in Mexico, utilized curved ferrocement rooms placed beneath grassy mounds, blending the structure seamlessly with the landscape.

Psychological Comfort and Light Management

Designing subterranean spaces requires careful consideration of human psychology, particularly concerning daylight and spatial orientation. Research indicates that reduced natural light, coupled with diminished control over surroundings, can lead to discomfort. To counteract this, architects often incorporate vital openings to the sky.

For instance, a 1979 earth-sheltered house in Scottsdale, Arizona, arranged its rooms around an open-air court, using full-height glazing to draw sunlight into buried areas. This approach brings a segment of the surface environment underground, helping occupants maintain a sense of orientation.

Similarly, UMMO Estudio's Casa Tierra in Córdoba directly incorporates existing limestone formations and rough calcarenite surfaces, allowing natural geology to become a core interior element.

Specifying Subterranean Solutions in Asia

For architects, interior designers, and developers in Asia considering subterranean or earth-sheltered projects, material selection and design strategies are critical for occupant well-being. Specifying materials like brick vaults or ferrocement provides structural integrity and leverages the thermal benefits of earth.

Crucially, integrating robust daylighting solutions, such as courtyards with translucent canopies or strategically placed skylights, is essential to address psychological factors related to light and orientation.

While the concept of living underground might initially evoke unease, post-occupancy studies, including one of earth-sheltered homes in Minneapolis and St. Paul, show high resident satisfaction that often improves after people move in.

Projects in Asia should prioritize design elements that provide perceived control and clear visual connections to the outside, ensuring these structures meet both practical and psychological needs.