In civil construction, Industry 4.0 emerges as a natural path to modernize the sector. In this sense, Building Information Modelling (BIM) stands out for promoting innovation in civil construction. The Brazilian government, following the worldwide movement, has created disclosure policies and encouraged the adoption of BIM. The government's expectation is to improve cost estimates, reduce the number of irregularities in the management of works, and avoid misuse of state financial resources. But how the BIM concept can contribute to increasing the reliability of the estimates through the application of 4D and 5D modeling. Through a literature review and exploration of published research, government reports, articles, and other sources, this work aims to understand how the steps of quantification and budgeting of the BIM BR Strategy can contribute to the assertiveness of cost estimates and reduction of irregularities linked to budgeting. Identifying the irregularities resulting from mistakes in the cost estimate and the possible contributions and limitations of the 4D and 5D process.