Objective: to identify, through the contributions of hospitalized children and adolescents, the characteristics they consider necessary for a hospital that promotes well-being and development. Method: descriptive and exploratory study, with qualitative data analysis, carried out with a total of 30 hospitalized children and adolescents. Data were collected through semi-structured interviews, mediated by drawing, and analyzed by inductive thematic analysis, supported by the theoretical framework of the humanization of health care and the Florence Nightingale’s Environmental Theory. Results: the designed hospital takes up the principles of Florence Nightingale’s Environmental Theory, as well as one of the guidelines of the National Humanization Policy, the environment, from two perspectives: elements and material resources from the physical environment; elements of comfort and well-being environment. Final considerations: hospitals such as the projected institution corroborate what is recommended in public policies, as they qualify health care.