The vacant buildings in Brazil can contribute to reduce the housing deficit when converted to social housing, even if their previous use is not residential. The conversion of these buildings into social housing can present different levels of difficulty. In this sense, a methodology is necessary to create an order of intervention. However, there are several variables of urbanism, architecture and engineering that need to be evaluated in order to choose a building to be converted. At the beginning of the process, these analyzes are challenging, due to the subjectivity and the scarcity of information at this stage. In this context, and considering the solutions found in the Systematic Literature Review, this reaserch work proposes a methodology based on a parametric model, which contributes to anticipate the analyzes, associated with Fuzzy Logic, which helps in the treatment of subjectivity, and with the multicriteria method TOPSIS, which makes the pre-selection process more efficient. A Process Map that proposes a new workflow was developed, relating studies of environmental comfort, location and direct cost with the state of conservation. The proposed map was applied to three case studies in the city of Rio de Janeiro. In order to validate the results and the criteria used, eleven structured interviews were carried out with architects experienced in housing rehabilitation projects. The results obtained in the interviews indicate that the proposed method supports the choice of the building, reducing its subjectivity. Furthermore, it facilitates the understanding, by inexperienced professionals, of the different analyzes that need to be carried out for a more rational choice.