Question
Please discuss the various items of variation in a cost estimation of a project.
Answer :
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In construction cost estimation, variations refer to changes in the quantities, rates, or specifications that affect the overall project cost. These variations arise due to multiple factors encountered during planning and execution, and a construction supervisor must carefully monitor them to maintain financial control. One major item of variation is change in quantities. Actual site conditions may differ from drawings, leading to increase or decrease in quantities of earthwork, concrete, or reinforcement. For example, deeper excavation due to weak soil increases cost. Another important variation is change in material rates. Prices of cement, steel, sand, and aggregates often fluctuate due to market
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