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Compressed Earth Blocks and Rainwater Harvesting in a Sustainable Community Shelter

Compressed Earth Blocks and Rainwater Harvesting in a Sustainable Community Shelter
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Utilizing compressed earth blocks and a rainwater harvesting system, this sustainable community shelter offers an adaptable living environment designed to address the housing needs of low-income families.
5 key facts about this project
01
Utilizes locally sourced compressed earth blocks for structural integrity and insulation.
02
Incorporates a dual water management system for efficient rainwater harvesting and greywater reuse.
03
Features a flexible interior layout that adapts to various family sizes and living arrangements.
04
Includes integrated community gardens to promote food security and social interaction.
05
Design enhances natural ventilation and temperature regulation through strategic orientation and openings.

### Overview

Located in South Africa, the Mud House project addresses critical issues of resource scarcity and housing accessibility, developed between 2015 and 2020 during a significant water crisis. This initiative presents a prototype for sustainable living, utilizing local materials to construct affordable housing that minimizes environmental impact. The design focuses on promoting community resilience and fostering a collaborative environment among residents.

### Spatial Efficiency

The architectural layout emphasizes compactness and functionality, enhancing spatial efficiency throughout the home. Open living spaces are created to adapt to the diverse needs of residents, with designated areas for communal activities, relaxation, and private living. This strategic arrangement facilitates an optimal flow within the household, encouraging interaction while maintaining private zones.

### Sustainable Material Use

The Mud House employs a variety of sustainable materials that underscore its commitment to environmental responsibility. Compressed earth blocks, sourced from local soil, form the primary walls, offering excellent insulation and temperature regulation. Timber frames, obtained through sustainable practices, provide structural support, while sandbags serve as durable insulation elements. The design also incorporates a green roof system to promote biodiversity and effectively manage water runoff. Each material choice is intentional, aligning with both budgetary considerations and environmental sustainability.

### Water and Energy Management

Effective water management is integral to the Mud House, featuring systems that capture, filter, and recycle resources. A rainwater harvesting system collects runoff from sloped roofs into storage tanks, complemented by greywater recycling for household activities, which reduces waste. The architectural design incorporates natural ventilation through high ceilings and strategically placed openings to enhance airflow, decreasing dependence on mechanical cooling. Orientation and thermal mass principles optimize natural light and passive heating, further reducing energy consumption.

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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.

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

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