[2] Écochard's first solo project in the colonies was the Museum of Antioch, in which he combined ancient Syrian architectural elements with modernist design.
[1] He changed Casablanca's urban plan from Henri Prost's radio-concentric system—like Paris—to a linear system, with expanded industrial zones stretching east through Aïn Sebaâ toward Fedala.
[9] At the 1953 Congrès Internationaux d'Architecture Moderne (CIAM), Écochard presented, along with Georges Candilis, the work of ATBAT-Afrique—the Africa branch of Atelier des Bâtisseurs founded in 1947 by figures including Le Corbusier, Vladimir Bodiansky, and André Wogenscky.
[8][16] In the early 1950s, Écochard commissioned GAMMA to design housing that provided a "culturally specific living tissue"[17] for laborers and migrants from the countryside.
"[20] Écochard's 8x8 meter model, designed to address Casablanca's issues with overpopulation and rural exodus, was pioneering in the architecture of collective housing.
[22][24] Throughout his career, Écochard also made plans for Pakistan,[22] Sabendé[22] and Fria in Guinea,[25] Martigues, Dakar, Martinique, Damascus, Tabriz, Corsica, Mashhad, Muscat, and Tehran.