Building Information Modelling Technological Innovations in Industrialised Building Systems Cost Estimation Mohamed Murteza Gulamhussein Moledina, Goh Wei Pin, Wallace Imoudu Enegbuma Department of Civil Engineering, Faculty of Engineering, Computing and Science Swinburne University of Technology Kuching, Malaysia 4314077@students.swinburne.edu.my, wenegbuma@swinburne.edu.my, wgoh@swinburne.edu.my Kherun Nita Ali and Kayode Adenuga Faculty of Built Environment, Faculty of Computing Universiti Teknologi Malaysia Skudai, Malaysia b-kherun@utm.my, kayodeadenuga@yahoo.ca Abstract—The paradigm shift in construction cost estimation is attributed to technological innovations in the spheres of building information modelling (BIM) and industrialised building systems (IBS). Majority of construction projects experience cost overruns which affect project objectives. The outcome of cost overruns invariably leads to disputes and further delays. Similarly, cost estimators resistance to overcoming the inertia to leap from traditional estimation methods to advanced methods further exacerbates the issues of cost estimation. This paper aims at comparing cost estimate between traditional cost estimation and advanced cost estimation. Data was collected via questionnaire from registered quantity surveying companies with the Board of Quantity Surveying Malaysia (BQSM). Subsequently, real time simulation was carried out on a sample IBS project using Autodesk Revit and Navisworks to compare cost estimates. The results revealed that BIM is accurate than bill of quantity (BOQ) as this difference results in a critical factor for large construction projects. The study was limited in terms of cost standard and database in Autodesk Navisworks. Future research can improve on the quantity coding for BIM in Malaysia. Keywords—building information modelling (BIM); industrialised building systems (IBS); cost estimation; Malaysia. I. INTRODUCTION The construction industry plays a major role in both the developed and developing countries as it is one of the driving forces in the economy. The development of this industry stems from both private and public sectors. However, the construction industry is always criticized due to the following reasons such as over budget of the project cost and slow delivery time of the project. The dominant concern of the clients and contractors in construction industry is the overall cost of the project [1]. In Malaysia, many development projects are under way and many more completed. However, during the work progress there are constant modifications and delays experienced which are the major drawbacks that increases total cost; causing this to be one of the expensive and serious problem in the construction industry in Malaysia. Adoption of innovative technology by construction professionals is much slower than other sectors [2-4]. Cost estimation is a vital activity in any construction project which has to be checked at various phases of the construction and it is also a precise process that is made to give the project cost [5]. [6] research found that IBS has been used in Malaysia since 1964 and has recently gained more attention due to the advancement of the technology. There are 5 diverse types of IBS such as pre-cast concrete, steel framing, steel formwork, prefabricated timber framing and block work system. Pre-cast concrete and steel structures are mainly used in Malaysia with cost playing a key role in IBS use [7]. IBS is a modern construction method that is an alternative to the conventional construction method in Malaysian construction industry. This alternative is used in order to bring innovation to the construction industry and also to solve different issues like foreign labour dependency, reduce site pollutions, increase site safety and most importantly to reduce the overall project cost. However, since IBS was introduced in 1964, the projects have been facing problem of project cost overrun. This problem of project cost overrun happens to be a major issue that is slowing the expansion of the Malaysian construction industry [8]. Cost overrun concerns happened after the ultimate cost or spending of the project surpasses the planned, projected or target price. Hence, it is vital to identify the major factors that influence the cost over budget, and find out effective technique