Berhanu Denu (PhD)Tedla Tiruneh2024-03-132024-03-132022-06https://etd.aau.edu.et/handle/123456789/2479Construction project delays are occurring in every phase of a construction project and are common problems in construction projects in Ethiopia. Moreover, it is well known that the delays in construction projects are the major causes of project failure. If the delay is not identified and the corrective project management decision is not taken in time, a project may incur extra cost and extension of project time, which gives rise to dissatisfaction to all the parties involved. Nowadays, it’s becoming a major obstruction for their development for developing countries like Ethiopia. This research first identified 24 key factors causing delay in EOC, and then evaluated by using the data collected in a survey of managers, site engineers, office engineers, and logistics engineers. Judgmental sampling techniques are used to select the respondents. The findings show that the main critical factors that cause construction delays in EOC are: escalation of the materials price, political instability in the country, poor project closeout practice, variation work order, change in drawing and unexpected subsoil conditions and recalled that it has a direct impact on the overall project. This paper finally came up with solutions towards reducing /minimize the causes of delays and its impact on project cost on construction projects in EOC. Keywords: Construction Delay, Delay Causes, Top-Ten Delay Factorsen-USThesis