Abstract
Construction project delays are often caused by suboptimal time and cost planning, particularly in substructure works, which serve as the initial phase in infrastructure development. This study aims to analyze the total duration and estimated cost of the substructure construction of the Dirung Bakung 2 Bridge in Murung Raya Regency using the Precedence Diagram Method (PDM). The data used includes detailed engineering drawings (DED), unit price analyses (AHSP 2024), and technical specifications, while scheduling was conducted using Microsoft Project software. The analysis involves identifying the logical sequence of each activity, defining interdependencies, calculating the critical path, and estimating the total time and cost required for completion. The results indicate that the execution of the substructure works requires 30 working days with an estimated total cost of IDR 1.057.109.192,21. The application of the PDM proved effective in developing an efficient project schedule and provided a clear and systematic visual representation of the dependencies between construction activities. This research is expected to serve as a technical reference for planning substructure works in similar infrastructure projects.