I In the activity of completing a project, there is a work plan that is already in the schedule. However, a construction project is often faced with a difference between planning and implementation. Based on observations in the field, the flat construction project has not been completed until September 2021. This project is planned to be completed at the end of July 2021. This has an impact on project implementation delays and other problems outside the schedule in the work plan. So that further research is needed to obtain relevant data, especially from the 4 parties involved in the construction. Project delays in this study are in the category of excusable compensable delay in the DKI Jakarta Flats project because the owner provides compensation in the form of additional project implementation time. The study used questionnaires distributed to owners, planning consultants, supervisory consultants and contractors implementing questionnaires which were distributed to 59 respondents from 5 flat construction projects in DKI Jakarta. The case studies taken in the study took 5 flat construction projects in DKI Jakarta in 2020. The data collection methods in the research were literature study and questionnaires. The results of the research on the factors causing excusable compensable delays in the Flats Project in DKI Jakarta, according to the planning consultant, are the first factor of equipment with the sub-factor of lack of availability of project equipment. According to the implementing contractor, the factor of place characteristics with sub-factors of the physical characteristics of buildings around the project site became the first factor of delay. According to the supervisory consultant, the situation factor with the project environmental sub-factors in the red zone area became the first factor of delay. According to the owner, the labor factor with the sub-factor of the number of workers in accordance with the existing work activities is the first factor of delay.