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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

Project in-detail

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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MICROHOME 10: Celebrating Small-Scale Living with €100,000 Prize Fund and Kingspan’s Innovation

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Competition organisers

The MICROHOME 10 competition invites participants to submit visionary designs for off-grid, modular microhomes that push the limits of sustainable, small-scale living. Organised by Buildner in partnership with Kingspan and Hapi Homes, this tenth edition sets the challenge of designing a dwelling for two people within a maximum floor area of 25 m², encouraging bold solutions adaptable to any urban or rural location. The competition continues Buildner’s mission to foster innovative approaches to compact, energy-efficient housing that can address pressing global challenges.

This year’s edition offers a generous total prize fund of €100,000, including the Kingspan Award for designs that integrate high-performance Kingspan products and the Hapi Homes Award for a project selected for real-world construction. In addition to cash prizes, the winners gain international exposure through Buildner’s media partnerships, publications, and a dedicated MICROHOME magazine, further amplifying their ideas to the wider architectural community.

Key dates for MICROHOME 10 include the closing date for registration on 25 September 2025, the submission deadline on 29 October 2025 (11:59 p.m. London time), and the announcement of winners on 9 December 2025. These milestones ensure participants have clear timelines to develop and present their concepts, with early registration discounts available to support students and emerging designers worldwide.

MICROHOME

Design a new small-scale home concept in the 10th edition of MICROHOME — 100,000 € prize + construction

100,000 € Prize Fund / Kingpsan Edition #10 ideas COMPETITION
Prize 100,000 € + Potential realisation
Eligibility Open to all
Final registration deadline 25 September 2025

Enter an open architecture
competition now

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