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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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The Buildner’s Unbuilt Award 2025: Celebrating Architectural Creativity and Visionary Unbuilt Designs with a Total Prize Fund of €100,000

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Competition organisers

The Buildner’s Unbuilt Award 2025 is an international architecture competition dedicated to recognizing and celebrating the value of unrealized architectural designs. It invites architects, designers, and students worldwide to submit visionary projects that have not yet been constructed, highlighting the power of ideas and the creativity behind the design process. By focusing on unbuilt work, the competition aims to bring forward concepts that shape the future of architecture and push the boundaries of the profession. 

Participants can compete in three categories based on project scale: Small Wonders (up to 100 m²), Medium Marvels (101–999 m²), and Large Visions (over 1,000 m²). Each category winner will receive €20,000, and additional prizes include honorable mentions, student awards, and a special Best Presentation Award. Winning projects will gain significant international exposure through Buildner’s publicity campaign and a feature article on ArchDaily, providing a unique opportunity to showcase creative ideas to a global audience. 

The Buildner’s Unbuilt Award 2025 encourages entrants to submit any type of unbuilt project, from conceptual visions to detailed designs, celebrating bold innovation without the constraints of realization. Important deadlines: registration closes on October 30, 2025; submissions are due by November 20, 2025; winners will be announced on December 17, 2025.

Buildner's Unbuilt Award 2025

Celebrating your unbuilt architecture visions with a €100,000 prize

100,000€ Prize / 2025 ideas COMPETITION
Prize 100,000 €
Eligibility Open to all
Final registration deadline 30 October 2025

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