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Concrete Retreats with Natural Greywater Purification

Authors:
Maria Bindiu, Colton Chehowy
Concrete Retreats with Natural Greywater Purification
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Concrete structures incorporate a natural greywater purification system to enhance sustainability while providing intimate sleeping spaces for couples in the tranquil forests of central Portugal.
5 key facts about this project
01
Cápsula features a natural greywater purification system utilizing a reed bed for water management.
02
Each sleeping pod is oriented to offer unique views of the surrounding landscape.
03
Interior walls made of concrete enhance sound insulation and structural strength.
04
The design prioritizes intimacy with nature through accessible outdoor bathing facilities.
05
The layout includes a central pathway that separates public and private spaces effectively.

Cápsula is an architectural proposal located in the forests of central Portugal, within the Vale de Moses Yoga retreat. Designed to accommodate couples, the sleeping pod emphasizes connections with nature, creating a relaxing space that enhances sensory experiences. Each capsule has a unique orientation that allows guests to enjoy different views of the surrounding landscape, encouraging a peaceful relationship with the environment.

Spatial Layout

The layout features a central pathway that divides public and private spaces effectively. This organization allows easy navigation while maintaining a sense of intimacy within each pod. Essential amenities, such as a washroom and outdoor shower, are included in the design, ensuring comfort for guests while minimizing distractions from the natural surroundings. This practical approach highlights the focus on user experience.

Acoustic Considerations

The design pays careful attention to acoustics, aiming to foster a calm atmosphere for relaxation. Each pod is designed to enhance external sounds while providing insulation from disruptive noise. This creates an environment ideal for meditation or contemplation. The use of concrete for the interior walls is significant, as it adds to sound absorption and structural strength, allowing for an immersive encounter with nature.

Sustainable Systems

Cápsula integrates a natural greywater purification system, which highlights its commitment to sustainability. Greywater from washing facilities is directed into a grease trap, where larger solids are separated. It then flows through a baffle filtration system that prepares the water before it reaches a reed bed. Here, plants help purify the water through a natural process, allowing for its reuse and promoting responsible resource management.

Each sleeping pod provides an opportunity for guests to connect intimately with the beauty of the forest. They are designed as personal retreats that invite quiet thought and deep appreciation of nature's surroundings. Each capsule serves as a space to escape and recharge, rooted in harmony with the environment.

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Celebrating Visionary Design: The Buildner Unbuilt Award 2026

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The Buildner Unbuilt Award 2026 celebrates visionary unbuilt architectural projects that explore creativity and innovation. Open to architects, designers, and students worldwide, the competition welcomes submissions 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).

With a total prize fund of €100,000, each category winner receives €20,000, alongside student prizes of €5,000 and a €10,000 Best Presentation Award. Winners will also be featured internationally and presented with the Continuum Trophy designed by Germans Ermičs.

Registration runs from 31 October 2025 to 23 September 2026, with submissions due by 20 October 2026 and results announced on 1 December 2026. More information is available at architecturecompetitions.com 

Buildner's Unbuilt Award 2026

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

100,000€ Prize / 2026 ideas COMPETITION
Prize 100,000 €
Eligibility Open to all
Final registration deadline 23 September 2026

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