The main objective of this paper is to analyze community issues of housing policy and the phenomenon of informality from a sociological point of view. It is a phenomenon that can occur gradually over the time, in a way that in the past decades, welfare policies for housing which is a part of the national planning system in the form of 5-year development plans, laws and also the plans drawn from them, have been converted to a part of a regenerative mechanism of informal processes. Accordingly, in the current study, attempts have been made to apply the methods of qualitative analysis, content analysis, and observation in order to investigate the causes and processes of the emergence of the abovementioned phenomenon in the context of the experience evolutions in Mianaabad district of Islamshahr, Tehran, Iran. Certainly, through this context, housing welfare policies, in the form of a new urban regimes based on urban entrepreneurialism, and with the support of state or international organizations and mechanisms, have found an informal nature and have caused more outskirt settlement. In fact, the increasing withdrawal of government as an institution formally intervened in housing policy, informal institutions have entered the field, escalated the informality, and contributed to the development of the suburban settlement by relying on a pre-existing mechanism: the market and leading it towards their own objectives and interests. In this situation, housing welfare policies, have found an informality nature and have become a mechanism for the regeneration of informality and suburb settlements in Mianabad of Islamshahr.