ECHO is a company whose mission is to provide adapted and sustainable building solutions to meet the needs of local communities. Our team is made up of people qualified in various fields such as architecture, civil engineering and project management, with extensive experience in sustainable construction and connected to a network of local masons and professionals in other trades (solar and hydraulic energy). We are involved in both the design and construction of buildings, focusing on three main principles: 1. Participating in the socio-economic development of local communities: We focus on buildings that are socio-health-related (health, education...), productive (agriculture, small-scale industry...), designed for commerce to mobilize the local economy (stores, market), or humanitarian (rehoused population...). Our buildings use local resources (local labor and materials) and minimize the use of imported resources. 2. Respect for the environment and adaptation to climate change: We give priority to the use of sustainable materials with a low energy footprint, widely available and renewable, used to construct buildings with high energy efficiency (bioclimatization) and powered by renewable energies. 3. Use construction techniques that are adapted and appropriable: We prioritize construction techniques that are adapted to local know-how and practices, easy to implement and maintain, economical and easy to duplicate.