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Bamboo Walls and Greywater Systems in a Mountain Retreat

Author:
Broby Leeds
Bamboo Walls and Greywater Systems in a Mountain Retreat
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Incorporating bamboo walls and a greywater recycling system, the structure harmonizes with its mountainous environment while serving as a retreat for guests seeking tranquility.
5 key facts about this project
01
Bamboo and cork materials used for exterior wall panels enhance sustainability.
02
The greywater recycling system repurposes water for toilet flushing.
03
Stilt foundation design minimizes landscape disruption on uneven terrain.
04
Multiple threshold options allow for adaptable use in various weather conditions.
05
Strategically placed windows maximize natural light and scenic views.

Twoferlar is located in the mountainous region of Portugal, overlooking the Rio Zêzere. It serves as a space for guests visiting Val Des Moses, focusing on the balance between communal and private experiences. The design involves two mirrored guest areas separated by a shared bathroom that also collects rainwater and grey water. This setup fosters social interaction while maintaining individual privacy, allowing guests to enjoy their surroundings in a serene environment.

Design Integration with the Landscape

The layout encourages movement around the building, promoting natural circulation. The placement of windows and openings enhances the connection between the interior and the exterior, ensuring that light filters into the space while providing views of the landscape. This thoughtful integration allows the structure to coexist with the natural features, reinforcing the overall concept of balance.

Adaptive Architectural Features

Twoferlar incorporates adaptable design elements. The use of different thresholds, such as shutters and awnings, allows the space to adjust to varying climatic conditions. The main entrance can be fully closed for security during storms, half-closed for privacy while allowing fresh air, or completely open for unobstructed views. This versatility supports different needs and enhances the comfort of the guests.

Sustainable Material Choices

The building employs a stilt foundation to address the challenges posed by the uneven terrain while preserving the surrounding ecosystem. Timber framing, lumber trusses, and concrete piles provide structural support while keeping the construction lightweight. Materials like earth thigh roofing tiles, bamboo, and cork for the exterior walls reflect a commitment to sustainability. Solid oak flooring adds warmth to the indoor spaces, creating a welcoming environment.

Water Management Strategies

An important feature of the design is its approach to water management. The roofs are set up to capture rainwater, directing it for use in showers and filtering it into a grey water system. This allows water to be reused for flushing toilets, showing a practical method of resource management. The design effectively combines functionality with an environmental awareness, ensuring that everyday actions support sustainability.

The arrangement of spaces and the choice of materials in Twoferlar come together to create a harmonious connection with nature. Each element is carefully considered to enhance the experience for guests, inviting them to immerse themselves in a tranquil setting that respects both the landscape and their personal needs.

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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.

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