This research addresses the experience of technical advisory services and technical assistance to Social Interest Housing in the Metropolitan Region of Rio de Janeiro (RMRJ), in the last 20 years. The intention is to reflect on the practice today, in view of the transformation that the experience has undergone over the last few years.Consecrated from the federal law of Technical Assistance for Housing of Social Interest, 11,888 of 2008, advice in architecture and urbanism existed even before it and, according to the law, is characterized by allowing populations that cannot pay for architecture and urbanism have the right to public and free technical assistance for the design and construction of housing of social interest for their own housing (Art. second., Law 11.888/2008).Lefebvre s notions of praxis and right to the city (1969) and Kapp s socio-spatial group (2018) will be the basis for the investigation and understanding of practices.Based on interviews with professionals and the population who have participated in the 3 case studies, a critical analysis of the experiences will be made, which are: the Family Architect Project - Housing Improvements in Morro Vital Brazil, in Niteroi, by the NGO Soluções Urbanas; Rehabilitation for housing of an idle building, Ocupação Manoel Congo, carried out by NAPP – Core advisory, planning andresearch, in downtown Rio de Janeiro and Mulheres em Ação, improvements and training for small renovations together with a collective of black women, carried out by Arche Projetos Participativos, in Campo Grande, west zone of Rio de Janeiro.