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How can you use BIM to improve the accuracy of your takeoffs?

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If you are an architect, you know how important it is to produce accurate and reliable takeoffs for your projects. Takeoffs are the process of measuring and estimating the quantities and costs of materials, labor, and equipment needed for a construction project. However, traditional methods of takeoff, such as manual calculations, spreadsheets, or 2D drawings, can be time-consuming, error-prone, and inconsistent. That's why many architects are turning to BIM (Building Information Modeling) to improve the accuracy of their takeoffs. BIM is a digital representation of the physical and functional characteristics of a building, which can be used for design, analysis, simulation, and documentation. In this article, we will show you how you can use BIM to improve the accuracy of your takeoffs in four ways.

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Hannah Singh

Architect | IGBC-AP
Isaac ADEDEJI

BSc, MSc Architecture, 3D Visualizer
Ahmad Firoozi

Architect and BIM Manager

1 Use 3D models

One of the main benefits of using BIM for takeoffs is that you can use 3D models instead of 2D drawings. 3D models allow you to see the spatial relationships, dimensions, and details of your building elements, such as walls, floors, roofs, windows, doors, etc. You can also use 3D models to create realistic renderings and animations of your design, which can help you communicate your vision to your clients and stakeholders. Using 3D models for takeoffs can help you reduce errors, omissions, and discrepancies that may occur when using 2D drawings, which can lead to inaccurate estimates and budget overruns.

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Hannah Singh

Architect | IGBC-AP
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An important aspect to consider is Level of Development (LOD) in the BIM Model. LOD signifies the degree of detail and accuracy in the modeling of building elements. It ranges from LOD 100 (conceptual) to LOD 500 (as-built). In the context of Quantity Take-Off, LOD 300 or more would be required. The higher the LOD, the more accurate and precise the information will be for estimating quantities. Utilizing BIM for Quantity Take-Off comes with a plethora of benefits. These include better accuracy, reduced time consumption, and the dynamic updating of quantities as the model undergoes modifications.

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Ahmad Firoozi

Architect and BIM Manager
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One of the main benefits that BIM has is modeling in a 3D area with all details and connecting to other software that is special in their fields, one of them is takeoff and estimate materials and facilities that will be used in the project and budget after that. When the model is modeled, all disciplines participate in it and progress and complete, all clashes will be found and solved, so the model reduces errors.

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Toka Shaheer

Architect | Interior designer
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Building the design in 3ds always cut it short in getting the right details in each design Having the actual plans and working sections with your vision in 3d modeling make the constructed designs so alike to the drawings and make it much easier to estimate BOQs and proper proportions as on the ground ..

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2 Use parametric data

Another benefit of using BIM for takeoffs is that you can use parametric data instead of manual inputs. Parametric data is the information that defines the properties, attributes, and relationships of your building elements, such as materials, specifications, quantities, costs, etc. You can use parametric data to create rules and formulas that automatically calculate and update your takeoffs as you change your design. For example, if you change the height of a wall, the parametric data will adjust the amount of paint, drywall, and insulation needed for that wall. Using parametric data for takeoffs can help you save time, avoid errors, and ensure consistency and accuracy across your project.

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3 Use integrated tools

A third benefit of using BIM for takeoffs is that you can use integrated tools instead of separate applications. Integrated tools are software or platforms that combine BIM with other functions, such as estimation, scheduling, procurement, etc. You can use integrated tools to link your 3D models and parametric data with your takeoff and cost databases, which can help you streamline your workflow and improve your efficiency. For example, you can use integrated tools to generate and export your takeoff reports, compare different design options and scenarios, track changes and revisions, and monitor your project progress and performance. Using integrated tools for takeoffs can help you optimize your resources, reduce waste, and increase your profitability.

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Farres Yasser, Ph.D.

Senior Lecturer/Program Leader/ Researcher in Sustainability for the Built Environment
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As a specialist in sustainable solutions, I am keenly interested in how BIM can enhance the field’s focus on carbon footprint. While BIM provides extensive data, we are currently unable to fully grasp the lifecycle analysis of a project and its environmental impact, especially concerning material choices for insulation and construction. As discussions emphasize the importance of this understanding, integrating plug-ins with BIM for LCA analysis becomes crucial. This development is essential for adjusting pricing, material selection, labor, and costs in alignment with environmental considerations.

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4 Use collaboration features

A fourth benefit of using BIM for takeoffs is that you can use collaboration features instead of isolated workflows. Collaboration features are tools or methods that allow you to share, review, and coordinate your BIM models and takeoffs with your project team, such as contractors, subcontractors, suppliers, etc. You can use collaboration features to access and update your BIM models and takeoffs in real-time, using cloud-based or web-based platforms. You can also use collaboration features to communicate and exchange feedback, comments, and questions with your project team, using chat, email, or video conferencing. Using collaboration features for takeoffs can help you improve your communication, alignment, and quality control across your project.

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Isaac ADEDEJI

BSc, MSc Architecture, 3D Visualizer
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Leveraging collaboration features in BIM for takeoffs offers a significant advantage. They enable seamless sharing, review, and coordination of BIM models and takeoffs among project teams, including contractors, subcontractors, and suppliers. Real-time access and updates through cloud or web platforms enhance efficiency, while communication tools like chat, email, or video conferencing facilitate feedback exchange. This collaborative approach not only improves communication but also enhances alignment and quality control throughout the project lifecycle.

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5 Here’s what else to consider

This is a space to share examples, stories, or insights that don’t fit into any of the previous sections. What else would you like to add?

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Isaac ADEDEJI

BSc, MSc Architecture, 3D Visualizer
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Using BIM for takeoffs has several benefits. It allows you to work with 3D models instead of 2D drawings, providing a clearer view of building elements and reducing errors in estimates. BIM also lets you use parametric data, automating calculations for materials and costs as your design changes, saving time and ensuring accuracy. Integrated tools in BIM combine various functions like estimation and scheduling, streamlining your workflow and improving efficiency. Collaboration features enable real-time sharing, reviewing, and coordinating with your project team, enhancing communication, alignment, and quality control throughout your project.

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Everest ?orbaxhi

Architect | BIM Coordinator
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Building Information Modeling, is a powerful tool for creating and managing digital representations of buildings and infrastructure. BIM further automates and streamlines the takeoff process through software tools, saving time and effort while maintaining data accuracy. Collaboration is enhanced by using a common data environment, promoting shared access to the latest, most accurate information among project stakeholders. The result is not just more accurate takeoffs but also improved estimates, bids, project performance, and profitability.

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Bijal Shah

BIM Consultant | Implementation Specialist in Deploying & Optimizing BIM with Virtual Construction Management Solutions | BIM Lead | Digital Transformation in AEC
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BIM helps you to precisely measure and compute area, materials, labor, and other costs associated with a project. It also gives you access to up-to-date information on the layout of the construction, which can assist engineers spot possible inconsistencies or inaccuracies in your takeoffs. Furthermore, BIM can assist you in identifying cost-cutting or efficiency-boosting opportunities.

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How can you use BIM to improve the accuracy of your takeoffs?

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1 Use 3D models

2 Use parametric data

3 Use integrated tools

4 Use collaboration features

5 Here’s what else to consider

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