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Dry Toilets and Green Roofs in A Modular Microhome Using Local Materials

Authors:
Jeremy Cyrille Barla Ekwe, Nelson Christian Ndjoune Kosso, Marion Limouzy, Caroline Veronique Engome épouse Barla Ekwe
Dry Toilets and Green Roofs in A Modular Microhome Using Local Materials

Project in-detail

Constructed with local clay bricks and featuring dry toilets alongside green roofs, the microhome promotes sustainability and community resilience while providing essential housing in a challenging urban environment.
5 key facts about this project
01
Utilizes local clay bricks for improved thermal regulation.
02
Integrates dry toilets to enhance water conservation efforts.
03
Features green roofs that support local biodiversity and food production.
04
Encourages communal living through strategically designed shared spaces.
05
Incorporates rainwater harvesting systems for sustainable resource management.
Terra 25 Microhome is an architectural design project located in Douala, Cameroon. It addresses the pressing need for sustainable housing in a culturally rich but economically challenged urban context. The project serves as a model for integrating modern living conditions with ecological awareness and community resilience. By prioritizing local materials, sustainable practices, and communal spaces, Terra 25 aims to enhance the quality of life for its residents while minimizing environmental impact.

The architecture of Terra 25 features a tiered design, organized into distinct functional levels. The ground level is predominantly dedicated to vegetable gardens, fostering self-sufficiency in food production. The first level includes living spaces arranged around a semi-public courtyard, promoting social interaction among residents. At the second level, elevated roofs provide shade and facilitate natural ventilation, essential for the tropical climate.

The project differentiates itself through its innovative approach to sustainability and community living. Unlike conventional microhome designs that focus solely on individual units, Terra 25 integrates shared spaces and gardens to foster a sense of community. The dry toilets incorporated into the design highlight an advanced approach to sanitation and waste management. This feature not only conserves water but also transforms human waste into compost, thus closing the nutrient loop within the housing ecosystem.

Another unique aspect of the Terra 25 Microhome is its integration of renewable energy solutions. The roofs are designed to accommodate solar panels, promoting energy independence for residents. This architectural strategy reflects a commitment to environmental stewardship and resource efficiency, crucial for impoverished urban settings facing utility shortages.

The material selection for Terra 25 is purposeful, focusing on locally sourced elements such as clay bricks and metal sheeting. These materials contribute to the building's thermal regulation and sustainability while fostering economic opportunities for local suppliers. The overall design supports ecological balance by incorporating green roofs that enhance biodiversity and improve residents' quality of life.

For those interested in exploring the architectural details further, a review of the architectural plans, sections, and designs will provide deeper insights into the innovative features and sustainable practices utilized in the Terra 25 Microhome project. The architectural ideas behind this project showcase an effective response to urban housing challenges while contributing to a more resilient community lifestyle.
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100,000€ Prize / 2025

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

Competition organisers

The 10th edition of the MICROHOME architecture competition invites architects and designers from around the world to explore the possibilities of compact, sustainable living. Hosted by Buildner in collaboration with Kingspan and Hapi Homes, this special edition challenges participants to design an off-grid, modular microhome for a young professional couple, with a maximum floor area of 25 m². Designs should prioritize innovation, efficiency, and real-world feasibility. 

A total prize fund of 100,000 € will be awarded, including three main prizes, the Kingspan Award, and the Hapi Homes Award, which will grant 15,000 € and lead to the construction of the selected design. The final registration deadline is September 25, 2025, and winners will be announced on Decebmer 9, 2025. For full competition details and submission guidelines, visit microhome.info.

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
Early bird registration deadline 22 May 2025
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