Comparative Analysis of BIM-Based Quantity Take Off and Manual BOQ in Building Structural Work

Authors

  • Sarju Universitas Janabadra, Indonesia
  • Zaky Abad Hakim Program Studi Teknik Sipil, Universitas Janabadra, Yogyakarta, Indonesia
  • Buddewi Sukindrawati Program Studi Teknik Sipil, Universitas Janabadra, Yogyakarta, Indonesia

DOI:

https://doi.org/10.33603/jki.v14i1.11485

Keywords:

Bill of Quantity, Building Information Modeling, Quantity Take-Off, Tekla Structures

Abstract

Quantity take-off (QTO) calculation is an important component in cost estimation and material control in construction projects. Manual methods based on 2D drawings and Bill of Quantities (BOQ) are prone to inconsistencies due to the global volume addition approach and do not always follow the actual geometric cuts. This study compares the results of QTO based on Building Information Modeling (BIM) using Tekla Structures with manual BOQ on the structural work of the Tegal City Public Service Mall Building. The analysis focused on three materials: concrete, formwork, and reinforcement including foundation elements, beams, columns, slabs, and stair slabs. The results show that the total BIM volume produces 1,989.49 m³ of concrete, 6,857.70 m² of formwork, and 302,817.10 kg of reinforcement, while the BOQ recorded 2,025.37 m³, 7,305.17 m², and 303,502.10 kg. The deviations were 1.77%, 6.13%, and 0.23%, respectively. The differences were mainly influenced by automatic geometry truncation in the 3D model, the separation of specific elements such as pitlift walls, and inconsistent reinforcement rules (clear span, overlap, and development length) in manual calculations. These findings confirm that BIM-based QTO and BOQ can produce significant quantity differences in some elements, and identify recurring sources of deviations that can be used as a basis for quantity audits and improve calculation consistency across similar projects.

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Published

2026-05-11

Issue

Vol. 14 No. 1 (2026): Jurnal Konstruksi dan Infrastruktur Vol 14 No.1 : April 2026

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