[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"doc-seo-241512-105":3,"detail-sidebar-cat-1-en-105":80,"doc-detail-241512-en":126},{"code":4,"msg":5,"data":6},0,"ok",{"site_id":7,"language":8,"slug":9,"title":10,"keywords":11,"description":12,"schema_data":13,"social_meta":73,"head_meta":75,"extra_data":77,"updated_unix":79},105,"en","automation-of-quantity-take-off-for-modular-construction","Automation of Quantity Take-off for Modular Construction","","Quantity takeoff is a repetitive foundation for downstream construction management tasks, yet current practice relies heavily on manual interventions that are time-consuming and error-prone. The challenge lies in incorporating cost breakdown structure classification into BIM in a usable way. This study proposes an automatic workflow that pre-loads unique classification into the BIM model, extracts material quantities to an Excel database, and applies derived-quantity formulas for ordering and purchasing. A Revit-based prototype and a modular house case study demonstrate significant time savings and improved estimation accuracy.",{"@graph":14,"@context":72},[15,34,55],{"@type":16,"itemListElement":17},"BreadcrumbList",[18,23,27,31],{"item":19,"name":20,"@type":21,"position":22},"https://docshare.wps.com","Home","ListItem",1,{"item":24,"name":25,"@type":21,"position":26},"https://docshare.wps.com/template/","Template",2,{"item":28,"name":29,"@type":21,"position":30},"https://docshare.wps.com/template/presentations/","Presentations",3,{"item":32,"name":10,"@type":21,"position":33},"https://docshare.wps.com/template/automation-of-quantity-take-off-for-modular-construction/241512/",4,{"url":32,"name":10,"@type":35,"image":36,"author":41,"headline":10,"publisher":44,"fileFormat":47,"inLanguage":8,"description":12,"dateModified":48,"datePublished":49,"encodingFormat":47,"isAccessibleForFree":50,"interactionStatistic":51},"DigitalDocument",{"url":37,"@type":38,"width":39,"height":40},"https://docshare.wps.com/thumbnails/automation-of-quantity-take-off-for-modular-construction/241512.png","ImageObject",442,249,{"name":42,"@type":43},"Aran","Person",{"url":19,"name":45,"@type":46},"DocShare","Organization","application/pdf","2026-10-11","2026-09-12",true,{"@type":52,"interactionType":53,"userInteractionCount":30},"InteractionCounter",{"@type":54},"ViewAction",{"@type":56,"mainEntity":57},"FAQPage",[58,64,68],{"name":59,"@type":60,"acceptedAnswer":61},"Why is quantity take-off currently time-consuming and error-prone in modular construction?","Question",{"text":62,"@type":63},"It is typically performed through manual engineering rules, paper-and-pencil methods, and calculators, requiring substantial effort for atypical projects and leading to higher risk of mistakes and difficult revisions when plans change.","Answer",{"name":65,"@type":60,"acceptedAnswer":66},"How does the proposed method automate quantity take-off?",{"text":67,"@type":63},"It pre-loads a unique classification system into the BIM model, extracts material quantities according to the classification (part number and unit number) into an Excel database, and uses front-loaded formulas to convert extracted quantities into the required ordering and purchasing format.",{"name":69,"@type":60,"acceptedAnswer":70},"What system was developed and what results were observed?",{"text":71,"@type":63},"A prototype system was developed using Autodesk Revit via the Revit Application Programming Interface. A modularized house case study shows considerable time saving and improved accuracy in project estimation.","https://schema.org",{"og:url":32,"og:type":74,"og:title":10,"og:site_name":45,"og:description":12},"article",{"robots":76,"canonical":32},"index,follow",{"doc_id":78,"site_id":7},241512,1791532730,{"code":4,"msg":81,"data":82},"success",[83,87,92,97,102,107,112,117,122],{"id":84,"doc_module":22,"doc_module_name":25,"category_name":29,"show_sort_weight":85,"slug":86},11,90,"presentations",{"id":88,"doc_module":22,"doc_module_name":25,"category_name":89,"show_sort_weight":90,"slug":91},12,"Resumes",80,"resumes",{"id":93,"doc_module":22,"doc_module_name":25,"category_name":94,"show_sort_weight":95,"slug":96},14,"Invoices",70,"invoices",{"id":98,"doc_module":22,"doc_module_name":25,"category_name":99,"show_sort_weight":100,"slug":101},15,"Posters",60,"posters",{"id":103,"doc_module":22,"doc_module_name":25,"category_name":104,"show_sort_weight":105,"slug":106},16,"Social Media",50,"social-media",{"id":108,"doc_module":22,"doc_module_name":25,"category_name":109,"show_sort_weight":110,"slug":111},17,"Forms",40,"forms",{"id":113,"doc_module":22,"doc_module_name":25,"category_name":114,"show_sort_weight":115,"slug":116},18,"Letters",30,"letters",{"id":118,"doc_module":22,"doc_module_name":25,"category_name":119,"show_sort_weight":120,"slug":121},21,"Paper Templates",5,"papers-templates",{"id":123,"doc_module":22,"doc_module_name":25,"category_name":124,"show_sort_weight":4,"slug":125},158,"General","general-158",{"code":4,"msg":81,"data":127},{"doc_id":78,"user_id":128,"nickname":42,"user_avatar":129,"doc_module":22,"category_id":84,"category_name":29,"doc_title":10,"doc_description":12,"doc_content":130,"file_id":131,"file_url":132,"file_type":133,"file_size":134,"view_count":84,"is_deleted":4,"is_public":22,"is_downloadable":22,"audit_status":22,"page_count":135,"language":136,"language_code":8,"site_id":7,"html_lang":8,"table_of_contents":137,"faqs":138,"seo_title":139,"seo_description":12,"update_tm":140,"read_time":30},137455076865,"https://ap-avatar.wpscdn.com/davatar_29158cc5080c5b710cf443261637dec0","Automation of Quantity Take-off for Modular Construction  \nHongru ZHAO1, Hexu LIU1 * and Mohamed AL-HUSSEIN 1  \n1 Department of Civil and Environmental Engineering, University of Alberta, Canada  \n*Corresponding author’s e-mail: [hexu@ualberta.ca](hexu@ualberta.ca)  \nABSTRACT  \nQuantity takeoff, serving as a foundation for the downstream tasks in the construction management, is a repetitive work. However, this process in current practice involves massive manual interventions, which is extremely time consuming and highly error-prone. This is partially due to the fact that incorporating cost breakdown structure formulated according to industry companies’ classification system into BIM still remains a challenge. This study thus exploits a methodology which allows construction practitioners to obtain quantity takeoff in an automatic manner. The main concept is to pre-load the unique classification information into the BIM model such that the quantity of materials in a given BIM model can be extracted and stored into a database (Excel Sheet) automatically in according with the preloaded classification system. Besides this, the unique classification information, along with formulas for derivedquantities, is front-loaded into the Excel Sheet database. As a result, the explicitly extracted quantities are converted by the preloaded formulas to the required format for the purpose of ordering and purchasing. A prototype system is developed based on Autodesk Revit through Revit Application Programming Interface. A case study of a modularized house reveals that a considerable amount of time saving and accuracy increasing of project estimation are achieved as a result of achieving the quantity takeoff automation.  \nKEYWORDS  \nModular construction; Quantity Take-off; Building Information Modelling  \nINTRODUCTION  \nModular construction refers to a substantial portion of building units are fabricated or assembled in an off-site manufactory and then transported to the construction field for site erection (Pasquire, 2002) . Modular construction had experienced a strong growth with an average of 12% from 1991 to 2001(Becker, 2003) . For such promising and high-tech industry, most companies still adhere to traditional means of quantity takeoff, which is performed by using engineering rules, paper-and-pencil methods, and calculators. Accordingly, the work of quantity takeoff on atypical 72 ft x 12 ft module project takes more than two hours by taking this manual approach. Besides that, the manual quantity takeoff is a highly error-prone and cumbersome task, and a quantity takeoff revision is also a nightmare for estimators due to plan changes. The current highly developed technology, which is Building Information Modelling (BIM), provides a more intelligent approach to perform the quantity takeoff than manual work. Generally, BIM is the process of modelling a three-dimensional (3D) data set and the intelligent and computable data stored in BIM model can be shared and utilized by various stakeholders. BIM also facilitates the  \nestimation, procurement, and construction activities by creating accurate virtual model with precise geometry and data (Eastman et al, 2008) . In terms of quantity takeoff, a large amount of commercial and in-house software is developed on basis of BIM platform. Among all of the software, “Autodesk Quantity Takeoff”, which is developed by Autodesk, is the most wellknown quantity takeoff software in the current industry. It enables the cost estimators to read and extract information (geometry, images and data) from building information modelling tools, such as Revit Architecture, Revit Structure and Revit MEP. After importing the data from BIM authoring software, Autodesk Quantity Takeoff is able to automatically measure, count and price building objects in minutes, and the takeoff results can be exported into different formats, such as Microsoft Excel and DWF file format (Autodesk Quantity Takeoff, 2015) . However, the high c","cbCaipj6kGxp4ayD","https://ap.wps.com/l/cbCaipj6kGxp4ayD","pdf",1109225,8,"English","# Abstract\n# Introduction\n# Methodology\n## Preload Revit Model with unique classification system","[{\"question\":\"Why is quantity take-off currently time-consuming and error-prone in modular construction?\",\"answer\":\"It is typically performed through manual engineering rules, paper-and-pencil methods, and calculators, requiring substantial effort for atypical projects and leading to higher risk of mistakes and difficult revisions when plans change.\"},{\"question\":\"How does the proposed method automate quantity take-off?\",\"answer\":\"It pre-loads a unique classification system into the BIM model, extracts material quantities according to the classification (part number and unit number) into an Excel database, and uses front-loaded formulas to convert extracted quantities into the required ordering and purchasing format.\"},{\"question\":\"What system was developed and what results were observed?\",\"answer\":\"A prototype system was developed using Autodesk Revit via the Revit Application Programming Interface. A modularized house case study shows considerable time saving and improved accuracy in project estimation.\"}]","Automation of Quantity Take-off for Modular Construction | PDF",1789176603]