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Reflective Glass Cabin with Underground Thermal Efficiency

Authors:
Sergio Homsy, Gabriel Andrea, Karim Jo Samaha
Reflective Glass Cabin with Underground Thermal Efficiency
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A reflective glass structure, partially submerged to optimize thermal stability and minimize visual disruption, serves as a sustainable retreat harmonizing with its forest environment.
5 key facts about this project
01
Reflective glass ensures minimal visual disruption while allowing natural light.
02
The cabin is partially submerged, enhancing thermal stability and energy efficiency.
03
A totem-like structure channels rainwater and supports diverse vegetation.
04
Heating utilizes a hypocaust system for efficient heat conduction throughout.
05
The design promotes sustainability through traditional lantern lighting methods.

"Concealed in the Woods" is located in the Baltic region of Latvia. The design serves as a retreat, focused on blending with the surrounding forest. The concept emphasizes a connection with nature while reducing visual impact. This is achieved through modern architectural techniques that reflect traditional styles.

Strategic Integration

The cabin features a double-pitched roof that reimagines the typical form of a cabin. Most of the structure is sunk more than halfway underground, effectively minimizing disruptions to the landscape. This method allows the building to take advantage of the Earth’s consistent temperature, providing warmth in the winter and cooling in the summer. Wind exposure is greatly reduced, resulting in a comfortable living space year-round.

Material Subtlety

A quarter of the structure rises above ground and consists of reflective glass. This choice of material allows natural light to enter freely, while also offering broad views of the forest. During winter, the glass helps create a greenhouse effect, warming the cabin when the trees lose their leaves. In contrast, it provides softer, indirect light during the summer months. These features align with the goal of energy efficiency while maintaining a strong connection to the environment.

Living Connections

Central to the design is a totem-like structure that serves as a key element within the landscape. This component connects the cabin to its setting, supporting various plants that grow around it. Additionally, the totem channels water through its core, directing it to a buried and filtered tank linked to the cabin. This design emphasizes sustainable water management practices and reinforces the relationship with nature.

Ecological Considerations

Heating is achieved through a "hypocaust," a system inspired by ancient Roman baths. This method allows for heat to be distributed through the floors and walls, keeping the space warm during colder months. The design relies on lanterns for lighting, moving away from electrical sources. This choice encourages traditional methods that are sustainable and promote a deeper connection to the natural world.

The cabin’s exterior features reflective surfaces that mirror the surrounding landscape, enhancing the experience of living within the forest. This design approach not only creates a retreat but also fosters a daily engagement with nature.

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Enter an open architecture
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MICROHOME 2026
MICROHOME 2026
100,000 € Prize Fund / Kingpsan Edition #11
The Next House: USA
The Next House: USA
20,000 USD Prize
Buildner's Unbuilt Award 2026
Buildner's Unbuilt Award 2026
100,000€ Prize / 2026

The Next House: USA — A Global Call to Reimagine the American Suburb

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Competition organisers

Buildner is launching The Next House: USA, a global architecture competition that challenges architects, designers, and thinkers to reimagine the American suburban home for the 21st century. For decades, the suburban house has symbolized comfort and stability, but today it often reflects excess, isolation, and environmental strain. This competition asks: how can the American home evolve to address climate urgency, economic pressures, and shifting social values?

Participants are tasked with designing a prototype home of no more than 1,500 sq ft (≈140 m²) for a household of two adults and one child. The design should be compact yet generous, adaptable, sustainable, affordable, and replicable across diverse U.S. contexts. More than a design exercise, the competition aims to spark a conversation about how homes can support healthier, smarter, and more connected communities.

The total prize fund is $20,000 USD. The final registration deadline is May 20, 2026, and winners will be announced on September 22, 2026. The Next House: USA invites architects, students, and visionaries worldwide to redefine what the American home means today—and what it should mean tomorrow.

The Next House: USA

Design the next suburban home for the USA

20,000 USD Prize ideas COMPETITION
Prize Monetary award
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