Abstract: “In Italy, unauthorized building is a very common phenomenon. In the present paper, we show the first results of a research focused on the impact of unauthorized buildings on urban and local systems, which frustrates the city plans and the previsions done before. For a start, it is appropriate to underline that if we want to know the amount and the quality of unauthorized building in the Italian Regions we need to proceed with a direct survey since Italian institutions, both at a national and at a local level, have not publicized any datum even if nearly thirty years have passed since the first national law concerning “building sanction” (Erbani, 2003). Italian laws determining rules and conditions in order to get building indemnity have been promulgated in 1985 (L. n. 47), in 1994 (L. n. 724), and in 2003 (L. n. 326). Because of the inefficient controls and of the increasing of unauthorized building, in the Eighties, Italian Government promulgated a law establishing that it was possibl”

Keywords: established, seven cases, unauthorized