Get inspired!

17,725 architecture projects

Learn from past Buildner architecture competition participants through our extensive project library, curated over more than 15 years!

Bamboo Walls and Greywater Systems in a Mountain Retreat

Author:
Broby Leeds
Bamboo Walls and Greywater Systems in a Mountain Retreat
Explore the full project presentation!
Subscribers only
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.

Noticed a mistake?
Highlight the text and click on
Noticed a mistake

Enter an open architecture
competition now

The Architect’s 
Stair
The Architect’s Stair
Take a step and make a statement! Edition #3
Kinderspace
Kinderspace
Architecture for Children’s Development #3
Buildner's Unbuilt Award 2025
Buildner's Unbuilt Award 2025
100,000€ Prize / 2025
The Home of 
Shadows
The Home of Shadows
The light studies. Edition #4
The Architect's 
Chair
The Architect's Chair
Take a seat and make a statement! Edition #5

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

`
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

Open architecture competitions

  • Closest deadline first
  • Project competitions first
    Selected winning projects have the potential to be constructed
  • Ideas competitions
    Experimental competitions with the focus on pushing the boundaries of creativity
new
Iceland 
Slow Sauna

Design slow sauna in Iceland

project COMPETITION
Prize Monetary award
Eligibility Open to all
Early bird registration deadline 26 November 2025
Concrete 
Pavilion

Design a concrete pavilion

Edition #3 ideas COMPETITION
Prize Monetary award
Eligibility Open to all
Final registration deadline 27 November 2025
new
Pavilion Atlas 2026

Design a story of your country

ideas COMPETITION
Prize Monetary award
Eligibility Open to all
Early bird registration deadline 21 January 2026

Recurring architecture competitions

new
The Architect’s 
Stair

Take a step and make a statement!

Take a step and make a statement! Edition #3 ideas COMPETITION
Prize Monetary award
Eligibility Open to all
Early bird registration deadline 15 October 2025
Kinderspace

Design a kindergarten of tomorrow

Architecture for Children’s Development #3 ideas COMPETITION
Prize Monetary award
Eligibility Open to all
Advance registration deadline 16 October 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
new
The Home of 
Shadows

Design a home with no artificial lighting

The light studies. Edition #4 ideas COMPETITION
Prize Monetary award
Eligibility OPEN TO ALL
Early bird registration deadline 5 November 2025
The Last 
Nuclear Bomb Memorial

Design a memorial that speaks to the cause of ending all nuclear weapons programs

Edition #6 ideas COMPETITION SILENT CONTEST For this competition, NO DESCRIPTION TEXT is allowed. The architecture ideas must be communicated strictly with visuals.
Prize Monetary award
Eligibility Open to all
Final registration deadline 13 November 2025
new
The Architect's 
Chair

Take a seat and make a statement!

Take a seat and make a statement! Edition #5 ideas COMPETITION
Prize Monetary award
Eligibility Open to all
Early bird registration deadline 20 November 2025
Hospice - 
Home for the 
Terminally ill

Design a safe and supportive space to those struggling with a terminal illness

Edition #5 ideas COMPETITION
Prize 10,000 €
Eligibility Open to all
Final registration deadline 26 November 2025
Museum of 
Emotions

Use architecture to create different emotional states

Edition #7 ideas COMPETITION SILENT CONTEST For this competition, NO DESCRIPTION TEXT is allowed. The architecture ideas must be communicated strictly with visuals.
Prize Monetary award
Eligibility Open to all
Final registration deadline 27 November 2025
Re:Form - 
New Life 
for Old Spaces

Choose a site—used, abandoned, or forgotten—anywhere in the world, and give it a new purpose

Edition #2 ideas COMPETITION
Prize Monetary award
Eligibility Open to all
Advance registration deadline 3 December 2025

Media, partners and clients

To view this project in detail,
please log in with your
Architects’ Network Plus account.
Subscription instantly unlocks all the architecture projects plus other member-only benefits:
  • Access the 17,725 Concept Library
  • Professional tools including file transfer, email, portfolio management, and more
Register now
Already a member? Log in

This website uses cookies to improve user experience and gather usage statistics.

More information is available in our Privacy & Cookie policy