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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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Kingspan MICROHOME 2026: Building Less to Create More

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Competition organisers

The Kingspan MICROHOME 2026 competition invites architects and designers worldwide to rethink small-scale living by creating an off-grid, modular micro dwelling under 25 m². Now in its 11th edition, the contest emphasizes sustainable, innovative, and human-centered design that demonstrates how compact living can have a big impact.

With a €100,000 prize fund, entries will be evaluated for originality, efficiency, and their response to contemporary environmental and social challenges. The competition is open to everyone, with submissions allowed individually or in teams of up to four. Registration closes on 30 September 2026, and winners will be announced on 15 December 2026.

By celebrating creativity within strict limits, MICROHOME 2026 continues to push the boundaries of compact architecture and sustainable living.

MICROHOME 2026

Design a new concept of small-scale home and share a prize fund of 100,000€

100,000 € Prize Fund / Kingpsan Edition #11 ideas COMPETITION
Prize 100,000 €
Eligibility Open to all
Final registration deadline 30 September 2026

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