The construction work contractor must know the proportion of the cost components for materials, tools, and wages. Knowing the ratio of the components actual costs helps the contractor estimate the new building structures value. Previous researchers have researched the large proportion of the cost component, but the research has not issued a linear model. The cost component is highly dependent on the management of construction resources on site. Knowing the proportion of the actual cost of structural elements to the building structure budget is very important. Data on cost components and total expenses were obtained from 52 buildings starting on floors 2-9, which have been worked on by intermediate periodical contractors for the last three years—data collection from January to March 2020. The proportion range of component actual cost is the difference between the maximum and minimum proportions. The proportion of actual building costs varies for each building—a linear regression equation balancing each cost component to the actual total cost. Knowing the cost component proportion model helps construction service providers allocate new buildings on time. They were simulating linear equationsfor estimating realistic component cost. By entering the actual value of the total structural cost with a budget of 90 percent, the proportion of labor, materials, and equipment costs 41.979% respectively; 27,829% and 10,317%. The implication of the results states that the largest ratio of the cost component falls to labor for multi-story building work.