Abstract
This article focuses on comparison between Manual/Traditional and Building Information Modelling (BIM) software based approaches for cost comparison. Centre line method for manual and Revit software for BIM based approaches are used in this research. The principal objectives of this research are to calculate quantities by Manual Centre line method, then to make the cost estimation fast, accurate, efficient, and errorless by using BIM software Rivet, and finally the comparison study of manual based and BIM / Software based estimation. For manual approach, quantities are calculated by multiplying the measurements of length, breadth, and height. Then to get the total quantities the deduction is subtracted from the quantities and final BOQ is prepared for which estimated cost of building is calculated. For BIM based approach, 3D model from 2D floor plan of building is prepared in Revit software, then to estimate the cost of building structure elements, sheets of quantities are generated in the schedule option of the view tab in the software. The Percentage difference between Manual and BIM / Revit Software estimation in brick work, RCC Slab, Plaster Work, PCC for Flooring, Floor Tile Work, Skirting, Paint Work, False Ceiling, Doors and Aluminum Work is 4.57, 2.61, 7.58, 3.27, 1.87, 6.73, 8.03, 1.87, and 0.00% respectively. The total cost difference between manual and BIM based estimation approach comes out to be 4.8%. It is thus concluded that the BIM-assisted estimates have better performance over traditional/manual estimating methods.
Highlights
Cost estimation is initial stage for any construction project; it helps to evaluate project feasibility, cost controls, and tendering process [1, 2]
Rough cost estimate can be an approximate estimate to find an approximate cost of a task based on plinth area rates very quickly and it permits the competent authority worried to consider the financial aspects of the scheme for administrative authorization to the design [3]
In order to prepare a detailed manual estimate, the estimator must have the drawings of the work such as plans and sections for taking measurements, identification of the nature of materials specifications to be used, and their rates at which the different items of work are carried out as per the Market Rate System (MRS) of the Finance Department, Government of the Punjab [7] to obtain the Bill of Quantities (BOQ)
Summary
Cost estimation is initial stage for any construction project; it helps to evaluate project feasibility, cost controls, and tendering process [1, 2]. Whereas, detailed cost estimation includes the specific particulars of the quantities, rates, and costs of all items for according technical sanction, tendering, and for satisfactory completion of a project [4]. In Manual detailed estimation approach, center line method is used for estimation in buildings where cross wall are not provided. In order to prepare a detailed manual estimate, the estimator must have the drawings of the work such as plans and sections for taking measurements, identification of the nature of materials specifications to be used, and their rates at which the different items of work are carried out as per the Market Rate System (MRS) of the Finance Department, Government of the Punjab [7] to obtain the Bill of Quantities (BOQ). Rates taken from MRS system of the Finance Department, Government of the Punjab are inserted in the software to obtain the Bill of Quantities (BOQ)
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