This research aims to conducting evaluations for the influence of side collapse of excavations on the estimated cost and time for a proposed project. The methodology applied in this research is to comprise several phases. The first phase focused on identifying factors, methods, and previous studies concerning the side collapse of excavations for construction projects. However, this phase included site visits to several construction projects with a focus to a selected case study in Amman. the second phase focused on designing a survey questionnaire regarding attitudes for the major factors affecting the side collapse of excavations in Jordan and their accompanies with the time and cost of carrying out the intended project, and then distributing this questionnaire to several engineers and experts working in the field of construction. The next phase for the research methodology was the analysis of the collected data (resulted from the distributed questionnaire) using SPSS program. Finally, the last phase of this research was concentrated on developing guidelines and preparing conclusions and recommendations. Based on the analysis of the field survey, the results indicated that there are various factors that affecting the side collapse of excavations for construction projects. It was concluded that the most important factor was the weather conditions and other surrounding conductions, in addition to Planning and following-up the methods used to protect commercial project excavations from collapse. Among other parameters, the lack of interest to plan for the time needed to conduct the required investigation is one of the significant results. Also lack of supplies for the project site prior to implementation (with emphasis on commercial building sites), facilitating the passage of workers and excavations to the project, and securing the side traffic at the project, as verified by the case study Accordingly, it is recommended that project managers before the implementation of the project shall investigate the methods to prepare the project before the start, in order to prevent the collapse of the side of the excavations for the construction projects, and the importance of working schedules required for all phases of the project so that no increase in the time and cost required to establish the project on the required quality.