The article aims to define theoretical references and topics for sociology of built environment, with particular attention to the artificial environment of the urban and metropolitan areas. A co-evolutionary paradigm of the relationships between social and bio-physical systems, states that both are characterized by internal evolutionary dynamics, and at the same time are influenced by those of the other system. Stemming from this paradigm, the article suggests that the specific objects of focus of sociology of built environment, are the interfaces (both material and intangible) through which this influence is exercised. However, the purpose is not to propose a further specialized sub-discipline, but rather to build a bridge between environmental sociology and urban studies.