Ecological approaches to young children's environment focus on the complex interrelations between children and their physical environment, especially in institutions (Legendre, 1999; Smith & Connolly, 1980; Campos-de-Carvalho, 1996). However, when researchers try to understand the interrelations between children and their physical environment in daycare centers, the playroom is often the central focus of the research, even in ecological approaches. This focus on the playroom overlooks the spatial organization of the building and its role in children's daily experiences. The playroom is not the only important area in the life of children in daycare centers. During the course of a day, they have many experiences in different parts of the building. Contextual approaches in developmental psychology suggest that, each day, a succession of zones of action affect children's development (Valsiner, 1987). Valsiner shows that, for young children, the ways in which space and physical resources are used are very important for development. Influenced by their own culture and experiences, but also by the building's spatial structure, caregivers create these zones of action. Each of them is defined by the physical space, physical resources, regulations (i. e., physical or psychological boundaries), and activities that are encouraged according to the developmental level of the child. In this way, caregivers create a spatio-temporal context for the development of children. The research to be presented analyzes these patterns and zones of action in five daycare centers in Quebec. These settings each have a very strong spatial and temporal structure. The study of these daycare centers aims at understanding the ways in which caregivers regulate the use of space for children in relation to the spatial structure of the building, but also according to their own values, experiences and interpretations of government rules and programs. It also aims at understanding the actual experiential opportunities for children in the building, considering not only its physical structure, but also the structure of the regulations in the building.