ASSESSMENT OF FACTORS AFFECTING ACCURACY OF COST ESTIMATION IN PUBLIC BUILDING CONSTRUCTION PROJECTS IN WESTERN OROMIA REGION, ETHIOPIA

Construction projects are getting progressively complex and their scales are getting sophisticated. Along these lines, it is getting more problematic to finish the projects inside planned cost limits. In Oromia public building construction projects these problems were raised as a typical challenge. Hence, evaluation of factors affecting the accuracy of cost estimation in public projects was the aim of this study. Both quantitative and qualitative methods were utilized for information assortment. Relative Importance Index (RII) was utilized for information investigation. Totally sixty -two variables were investigated and the best five most significant were selected by this assessment based on the average view of respondents. These significant factors are; Material price/accessibility /source /quality /imports, Experience and ability of the consultant, Variability in the Economy of the country, and financial conditions of client.  Spearman's rank correlation coefficients (rho) investigation was conducted by the assistance of SPSS 20 version for a testing level of connections among respondents on the positioning of the factors affecting the accuracy of cost estimation. Spearman’s rank correlation results were 0.823 among Clients and Consultants, 0.813 among clients and contractors, and 0.802 among Consultants and Contractors. The outcome shows that the rate of the rank correlations was a high positive number, which implies there is a positive connection between them on the ranking of factors disturbing the accurateness of cost estimation in public building construction projects in western Oromia.