This study aims to apply the CPM in planning and controlling a one-story house construction project in Samarinda City. CPM is used to identify the critical path, which is a series of activities that have no float and directly affect the duration of project completion. The research method used was descriptive quantitative with a case study approach. Data was collected through field observations, structured interviews, and analysis of project documents such as the Cost Budget Plan (RAB) and time schedule. The results of the analysis showed that CPM was able to arrange the sequence of activities logically, determine the start and finish time of each activity, and identify the critical path with a total duration of 77 days. These findings show that CPM is effective in improving project time efficiency, optimizing resource allocation, and minimizing the risk of delays. The application of this method makes a real contribution to more structured construction planning, especially in small-medium scale projects such as the construction of a one-story house.