In many developing nations, urbanisation is often linked to informal or unplanned settlements where urban poverty has flourished. In this regard, Türkiye is one of these countries. However, similar to the circumstances observed in other developing nations, Türkiye has, to some extent, succeeded in transforming such areas. This chapter examines the policies implemented to prevent the further proliferation of informal housing areas, particularly gecekondu settlements, from a historical perspective. Amnesty laws for informal housing areas, which originated in the 1950s, have been replaced by comprehensive urban transformation projects supported by a series of regulations. The urban transformation experiences presented reveal a significant absence of social impact assessments, irrespective of the legal frameworks on which they were founded. Moreover, the lack of social impact assessments in these transformed areas may lead to gentrification, displacing the poor to alternative informal housing contexts.