Construction projects have become increasingly complicated and challenging to manage in recent years, especially in analyzing the quantity and cost estimation of construction work to get accurate results and overrun costs. The interdependence among different work items involved, such as architects, civil and electrical works, is one of the fundamental reasons. Besides that, the differences in standards used in analyzing the quantity and unit cost per work item made it more complicated. The existing theories and research confirmed that Building Information Modeling (BIM) is capable of geometric modeling of building performance and assists in calculating correct quantity and detailed cost estimations. By utilizing standard measurement rules in modeling construction projects into BIM to avoid wrong analysis and information. However, using BIM to calculate the quantity and cost estimate, such as wall works, the results are sometimes inaccurate, because missing some information or have elements that overlap or intersect with others. It is because walls are the elements that have the most relationships with other elements then have different heights of the walls in each room, and also have many types of walls used in the building. This problem can be avoided by checking the modeling manually but will take more time, and there may be missed elements.
This study analyzed the existing modeling based on the measurement rules and unit cost standards to analyze the problem which has been explained above. Understanding the items was considered when examining the walls quantity to avoid missing information. In addition, measurement rules standards are utilized to calculate QTO, including NRM 2 standards from the UK and SMPI standards from Indonesia, to calculate the cost based on Indonesia standard SNI-AHSP. Furthermore, using visual programming Dynamo to analyze the quantity of wall works based on the required data, extract the data/information needed to calculate the cost based on unit cost standard, and check if the walls intersect with other elements to avoid excess quantity. Finally, using BIM technology based on standard measurement rules and overlapping element analysis to calculate the quantity and cost produced accurate quantity results and obtained the maximum cost detail per work item. Moreover, generate the information about the analysis results by utilizing the intelligent module to present the required information of the wall works, which improves the inadequacy of BIM. Indeed, it could save more time than calculating them manually and reduce human errors.

[1] Abanda, F. H., Kamsu-Foguem, B., and Tah, J. H. M. (2017). BIM – New rules of measurement ontology for construction cost estimation. Engineering Science and Technology, an International Journal, 20(2), 443–459. https://doi.org/10.1016/j.jestch.2017.01.007
[2] Analisis Harga Satuan Pekerja (2011). Analisis Harga Satuan Pekerjaan – Standart Nasional Indonesia.
[3] Andersson, L., Farrell, K., Moshkovich, O., and Cranbourne, C. (2016). Implementing virtual design and construction using BIM: current and future practices. Routledge.
[4] Aram, S., Eastman, C., and Sacks, R. (2014). A knowledge-based framework for quantity takeoff and cost estimation in the AEC industry using BIM. Proceedings of the 31st International Symposium on Automation and Robotics in Construction (ISARC), 434–442. https://doi.org/10.22260/ISARC2014/0058
[5] Autodesk. (2016). Dynamo BIM. http://dynamobim.org/
[6] Autodesk. (2020a). Revit. https://www.autodesk.com/products/revit/overview
[7] Bečvarovská, R., and Matějka, P. (2014). Comparative analysis of creating traditional quantity takeoff method and using a BIM tool. Construction Maeconomics Conference. http://www.conferencecm.com/podklady/history5/Prispevky/paper_becvarovska.pdf
[8] BIMForum. (2019). Level of development (LOD) specification part 1 & commentary for building information models and data. https://bimforum.org/wp-content/uploads/2019/04/LOD-Spec-2019-Part-I-and-Guide-2019-04-29.pdf
[9] Husin et al (2020). Improvement of Cost Performance Based On BIM Quantity Take-Off Hospital Structure Work. Research Square. DOI: 10.21203/rs.3.rs-117801/v1
[10] IQSI (n). SMPI – Standart Metode Pengukuran Indonesia. https://iqsi.org/smpi-standart-metode-pengukuran-indonesia/
[11] Khosakitchalert, C., Yabuki, N., and Fukuda, T. (2019a). Improving the accuracy of BIM-based quantity takeoff for compound elements. Automation in Construction, 106, 102891. https://doi.org/10.1016/j.autcon.2019.102891
[12] Khosakitchalert, C., Yabuki, N., and Fukuda, T. (2020). Automated modification of compound elements for accurate BIM-based quantity takeoff. Automation in Construction, 113, 103142.https://doi.org/10.1016/j.autcon.2020.103142
[13] Khosakitchalert, C., Yabuki, N., and Fukuda, T. (2018). The accuracy enhancement of architectural walls quantity takeoff for schematic BIM models. Proceedings of the 35th International Symposium on Automation and Robotics in Construction (ISARC), 768–775. https://doi.org/10.22260/ISARC2018/0108
[14] Lee, S. K., Kim, K. R., and Yu, J. H. (2014). BIM and ontology-based approach for building cost estimation. Automation in Construction, 41, 96–105. https://doi.org/10.1016/j.autcon.2013.10.020
[15] Mattern, H., Scheffer, M., and Konig, M. (2018). BIM-Based Quantity Take-Off. In Borrmann et al (Ed.). Building Information Modeling Technology: Foundations and Industry Practice (pp. 383-391). Switzerland: Springer International Publishing AG.
[16] Monteiro, A., and Martins, J. P. (2012). BIM modeling for contractors - improving model takeoffs. Proceedings of the 29th CIB W78 International Conference. https://repositorio-aberto.up.pt/handle/10216/66830
[17] Monteiro, A., and Martins, J. P. (2013). A survey on modeling guidelines for quantity takeoff-oriented BIM-based design. Automation in Construction, 35, 238–253. https://doi.org/10.1016/j.autcon.2013.05.005
[18] Nadeem, A., Wong, A. K. D., and Wong, F. K. W. (2015). Bill of quantities with 3D views using building information modeling. Arabian Journal for Science and Engineering, 40(9), 2465–2477. https://doi.org/10.1007/s13369-015-1657-2
[19] Landa Arc hBIM (n.d). Revit Dynamo Hierarchy of Elements. http://landarchbim.com/2016/03/09/revitdynamo-hierarchy-of-elements/
[20] Royal Institution of Chartered Surveyors (RISC). (2012a). NRM 1: Order of cost estimating and cost planning for capital building works. https://www.rics.org/globalassets/rics-website/media/upholding-professional-standards/sector-standards/construction/nrm-1-order-of-cost-estimatingand-cost-planning-2nd-edition-rics.pdf
[21] Royal Institution of Chartered Surveyors (RISC). (2012b). NRM 2: Detailed measurement for building works. https://www.rics.org/globalassets/rics-website/media/upholding-professional-standards/sector-standards/construction/nrm-2-detailed-measurement-for-building-works-1st-editionrics.Pdf
[22] Sattineni, A., and Bradford, R. (2011). Estimating with BIM: a survey of US construction companies. Proceedings of the 28th International Symposium on Automation and Robotics in Construction(ISARC), 564–569. https://doi.org/10.22260/ISARC2011/0103
[23] The Dynamo Primer. (2019). Python nodes. https://primer.dynamobim.org/10_Custom-Nodes/10-4_Python.html
[24] Towey, D. (2013). Cost Management of Construction Project. United Kingdom: Willey Blackwell
[25] Veras de Carvalho, Y. M., Olimpio, L. C. M., Lima, M. G., Lima, M. M. X., and Barros Neto, J. P. (2021). BIM and Visual Programming Language Supporting Project Constructability. Proc. 29 th Annual Conference of the International Group for Lean Construction (IGLC29), pp. 126–135, doi.org/10.24928/2021/0199
[26] Zima, K. (2017). Impact of information included in the BIM on preparation of bill of quantities. Procedia Engineering, 208, 203–210. https://doi.org/10.1016/J.PROENG.2017.11.039