The research aimed to investigate the degree of the project management triangle and its various measures (cost, time, quality) in the primary school extension program in Bole Sub City and to examine the degree of construction project performance and aimed to test the moderating role of COVID 19 the relationship between iron triangle and construction project performance. The target population of the study comprised 100 stakeholders involved in Bole sub-city public primary level school extension building construction projects. And out of these 80 samples were taken 71 samples are returned. The study used both descriptive and explanatory statistics to analyze the data collected from the questionnaire. The result revealed that COVID 19 is moderately affecting the relationship between the project management triangle and construction project performance. Based on the result the research recommended Keep applying and exerting efforts on the realization and application of effective Project management triangle practices is important for stakeholders in evaluating, controlling, and monitoring of cost, Time, and quality of construction projects during the crisis.