Abstract : When a project takes longer than expected, it is delayed. A cost overrun refers to a project's budget overrun. Time and cost determine the success of construction projects. Construction industries worldwide face delays and cost overruns. This study identifies delays and cost overruns in Indian and East African construction projects. The Fuzzy development model predicts SPSS data analysis. Poor site management, improper planning and scheduling, financial problems, insufficient experience, construction mistakes and defective work, contractor-subcontractor conflict, and slow decision-making were found to be contractor-related factors. 2) Delays in India and East Africa are caused by things that have to do with the client, like taking too long to make a decision, stopping payments in progress, changing the contract, or not communicating well. Poor weather, lack of equipment, inflation, insecurity, crises, and disasters cause construction delays in East Africa but not India. 1) Contractor-related factors include poor project management, mistakes during construction, a lack of cost planning, delays, underestimating project costs, and a lack of experience. Changes in client requirements, payment delays, etc. In India and East Africa, budget overruns are caused by owners' financial difficulties. External factors (unpredictable weather, unskilled labour, equipment failure, accidents, high-cost machines, insecurity, disasters and crises) cause cost overruns in East Africa but not India.