Application of Lean Construction in The Structural Work of the Arumaya Office Building Project

This study aims to evaluate the implementation of lean construction, identify the causes of waste, and analyze its impact on time performance in the structural work of the Arumaya Office Building project in Jakarta. Lean construction focuses on reducing waste and increasing added value in the construction process. However, the project faced several challenges, such as design revisions, limited storage space, and technical obstacles that contributed to waste.The method used is exploratory with a quantitative approach. Data were collected through interviews and questionnaires, then analyzed descriptively to identify the most dominant waste factors. The results show that lean construction has been implemented, although improvements are still needed. The most frequent type of waste is defects caused by a lack of coordination. The greatest impact on project delays comes from damaged materials due to poor maintenance. These findings provide a strategic foundation for improving the implementation of lean construction in future projects