1. A method for performing quantity takeoff computations, the method comprising: receiving a selection of a two-dimensional (2D) sheet included in a computer-aided design (CAD) drawing; receiving a selection of a first instance associated with a first drawing object included in the 2D sheet; quantifying the first instance by determining a first quantified value; determining a takeoff object associated with the first drawing object and configured to include cost data; and computing a cost estimate for the first instance based on the first quantified value and the cost data.