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Spherical Form Constructed with Compressed Earth and Recycled Steel for Sustainable Living

Authors:
José Serrano, Jaime Kelly, Carla Serrano, Luis Bertomeu
Spherical Form Constructed with Compressed Earth and Recycled Steel for Sustainable Living
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Constructed using a combination of compressed earth blocks and recycled steel, the building’s spherical form maximizes natural light and ventilation while providing a sustainable living space.
5 key facts about this project
01
Constructed with a modular system for easy assembly and disassembly.
02
Integrates rainwater harvesting systems within the structure for resource efficiency.
03
Utilizes compressed earth blocks for thermal mass and sustainability.
04
Includes bio-digester systems to convert organic waste into biogas.
05
Designed with a spherical geometry to enhance natural light and airflow.

# Architectural Design Report: Terrae – The Worth of Our Soil

## Concept Overview

Located within a context that emphasizes sustainable development, Terrae embodies principles of the Circular Economy to enhance the relationship between human habitation and the natural environment. By prioritizing ecological health, this project integrates innovative architectural practices with an understanding that built environments should serve broader sustainability goals while fulfilling their immediate functions. The design promotes the use of sustainable materials and advanced construction techniques, ensuring the structure's resilience and adaptability over time.

## Spatial Strategy and Materiality

The design employs a spherical geometry constructed from polygonal elements, achieving both aesthetic diversity and structural integrity. This configuration allows for effective force distribution, enhancing the building's stability while evoking organic forms found in nature. Central to the construction are recycled steel and compressed earth blocks, which form the primary structural and thermal envelope. Additional materials, such as wood and translucent polycarbonate, contribute to the interior ambiance and optimize natural light utilization. The incorporation of bio-digester systems exemplifies a commitment to renewable energy and waste reduction, while locally sourced foundation materials reinforce the project's focus on sustainability and support for the local economy.

## Construction and Adaptability

The construction system integrates a robust metallic skeleton with a façade of compressed earth blocks, creating a layered structure that enhances insulation and minimizes energy consumption. Within this framework, a technical core facilitates organized plumbing and electrical systems, while rainwater collection systems illustrate the project's dedication to sustainable resource management. The design allows for adaptable configurations, accommodating various locations and climates through modular elements that simplify assembly and disassembly, making it suitable for both adaptive reuse and site-specific solutions.

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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.

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

100,000€ Prize / 2025 ideas COMPETITION
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