1. A method for performing quantity takeoff computations, the method comprising: receiving a selection of a drawing object, wherein at least one instance of the selected drawing object is included in a computer-aided design (CAD) drawing; determining a takeoff object associated with the selected drawing object; generating a quantified value for each instance of the selected drawing object based on a takeoff property associated with the takeoff object; and computing a cost estimate for each instance of the selected drawing object based on the quantified value for the instance and cost data included in the takeoff object.