Construction is a highly demanded for rapid development. In Chitwan, recently, large construction projects are ongoing that includes commercial buildings in majority. However, Construction industry is taken as the dangerous and dirty industries. Like every construction project, commercial building projects also involve different factors of Accident. Safety aspect is less concerned on the construction site. The objective of the paper is to assess the causative factors accidents in construction projects of commercial Building in Bharatpur. It will be significant to the construction practitioners and its stakeholders. It helps them to avoid accidents by maintaining safety requirement in their construction project and help them implement good provisions of safety adopted by other companies. Site visit of the Housing and interview were conducted after extensive literature review to list all the possible factors for questionnaire preparation. Questionnaires survey was conducted to all the consultant and contractor team working in the Area. Relative Importance Index was used to rank the major accident causation factor. The causation factor attribute to organizational level were identified as major one. No compliance to governmental safety rules and regulation, Workers Negligent in wearing personal protection items, Lack of working space and site layout, Condition of equipment, Workers was rushing to the work and Appropriate Personal Safety procedures were not specified were majour factors of accidents. The housing safety management in the project was inferior to the anticipated codes and byelaws. Some of the accident causation factor from the literature review also coincides with the risk and hazards in the housing construction.