The rule of thumb in construction estimating is to be as detailed as possible. This means accurately breaking down the costs that go into labor, materials, and overhead.
Using the centerline method, all the total lengths are added, after which the overlaps that occur in T-junctions are excluded. In this method, the volumes of the structures are calculated first. After the values are obtained, it is multiplied to the rates of each material used, giving us the total amount required.