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Spiral Formation with Timber and Concrete in a Community Hub

Authors:
Debora Cheng, Jennifer Huang, Krish Girdhari
Spiral Formation with Timber and Concrete in a Community Hub
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Constructed with a spiral layout and incorporating sustainable timber and concrete, the building serves as a multifunctional community hub, dedicated to fostering social interaction and environmental responsibility.
5 key facts about this project
01
The building features a spiral circulation path that encourages communal interaction.
02
It uses in-situ concrete walls complemented by glass partitions for natural light.
03
Rainwater collection is integrated within the roofing system for sustainability.
04
A community kitchen supports farm-to-table practices and encourages collaboration.
05
The design includes a reflection garden for personal contemplation and relaxation.

The Spirala Community Home is located in the north-west region of Proença-a-Velha, Portugal. This place has mild winters and hot, dry summers. The structure serves as a gathering space for the community, designed to encourage social interaction while responding to the environmental conditions. The main idea behind the design is to blend sustainability with the agricultural landscape, honoring the local heritage of farming.

Site Organization

The layout of the site is carefully planned into specific zones for different activities. The Community Zone includes spaces for workshops and classes, aimed at bringing people together. There is also an existing agricultural building that plays an essential role in supporting local farming. The Vineyard Zone is dedicated to growing crops, while a Wilderness Zone is preserved to protect the natural landscape and promote a connection with the environment.

Interior Programming

Spaces within the Spirala Community Home accommodate a range of activities such as performances, workshops, and yoga sessions. Important features like composting toilets and a community kitchen support sustainable practices and enhance the communal living experience. Additionally, a reflection garden serves as an outdoor area for personal contemplation, creating a balance between indoor and outdoor settings.

Architectural Framework

The building’s design focuses on durability and efficiency. The roof is made with metal over timber trusses, designed with integrated gutters for rainwater collection. In-situ concrete walls combined with glass partitions allow natural light to flow in, making the interior feel spacious and open. Water features placed throughout the site add to the aesthetic appeal and strengthen the connection with nature.

Sustainability Initiatives

Sustainability is a central concern for the Spirala Community Home. Systems for rainwater harvesting and greywater recycling demonstrate a commitment to minimizing environmental impact. Composting toilets help reduce waste, while photovoltaic solar panels enable the building to generate its own energy. There is also a rainwater filtration system in place, ensuring access to clean water.

Circulation around the building follows a round spiral layout. This design encourages movement and interaction among users. The combination of open communal spaces captures the essence of living together as a community.

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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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