Takeoff
Takeoff is the process of counting, measuring, or otherwise extracting data from construction documents in order to quantify and cost it.
Extension
Extension is the process of calculating the takeoff items into meaningful financial data.
Breakdown
The breakdown is an analysis or separation of items in a particular component of an estimate.
Overhead cost
Overhead are the costs such as office rent, utility costs for the home office, project manager and estimator salaries, clerical staff, like payroll clerks and material handlers, are some of the common items that make up the overhead.
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thank you