Significant Construction Cost Model based on Standard Construction Cost Analysis for Infrastructure Buildings

The government needs to examine the cost to determine a regulation related to infrastructure planning and budgeting. Cost estimates an earlier stage of the project, mostly based on historical data of past projects with a similar concept. Cost Significant Models and Parametric Methods used at the conceptual stage aim to find components of calculation and make comparisons of both methods in conducting cost estimates to have the most accurate method. The cost model is a significant method of estimating costs using Standard Construction Cost data implemented in Surabaya Indonesia Government projects in the fiscal year 2013 – 2020. From R square value show that 99.9% of costs (Y) are influenced by factors soil and foundation, concrete work, wall, flooring, roof, and ceiling, while the remaining 0.1% is influenced by other factors. Five cost significant items have total cumulative percentage cost (87,3%), while the rest consists of preliminary work, doors and windows, electricity, sanitation, and plumbing. Model cost estimated the cost of construction of the infrastructure building is Y = 401.703 + 1,161 X2 + 1.109 X3 + 0.821 X4 + 1,709 X5 + 1,165 X7. There is the occurrence of cost of soil and foundation (X2), concrete work (X3), wall (X4), flooring (X5), roof and ceiling (X7) significantly affect the overall cost of constructing building infrastructure.