Original Article ISSN (Online): 2454-1907 International Journal of Engineering Technologies and Management Research October 2022 9(10), 1–9 How to cite this article (APA): Rauzana, A. (2022). Factors Causing Cost Overruns in Construction Projects. International Journal of Engineering Technologies and Management Research, 9(10), 1-9. doi: 10.29121/ijetmr.v9.i10.2022.1231 1 FACTORS CAUSING COST OVERRUNS IN CONSTRUCTION PROJECTS Anita Rauzana 1 1 Department of Civil Engineering, Universitas Syiah Kuala, Aceh, Indonesia ABSTRACT The complexity of a project often causes differences in what has been planned and its implementation in the field, resulting in delays and cost overruns. The successful implementation of a construction project is the target and expectation of the project owner and contractor, who has an effective time with a budget that is according to plan. But, in project implementation, there are often problems with the emergence of cost overruns that can cause losses. The purpose of this study was to analyze the dominant factors causing cost overruns in irrigation projects in Aceh Besar District. This study uses questionnaire data addressed to irrigation contractors, the total population obtained was 46 contractor companies, through the Slovin equation, the research sample obtained was 32 contractors. Data processing uses descriptive statistics. The results showed that the dominant factor causing the cost overrun of irrigation projects was the increase in material prices, with a mean value of 4,531. Received 14 August 2022 Accepted 15 September 2022 Published 05 October 2022 Corresponding Author Anita Rauzana, anrauzana@unsyiah.ac.id DOI 10.29121/ijetmr.v9.i10.2022.1231 Funding: This research received no specific grant from any funding agency in the public, commercial, or not-for-profit sectors. Copyright: © 2022 The Author(s). This work is licensed under a Creative Commons Attribution 4.0 International License. With the license CC-BY, authors retain the copyright, allowing anyone to download, reuse, re-print, modify, distribute, and/or copy their contribution. The work must be properly attributed to its author. Keywords: Cost Overrun, Construction Project, Contractor Company, Project Cost 1. INTRODUCTION Construction project development in Indonesia is growing with the increasing need for infrastructure facilities and infrastructure, as well as other facilities to support the activities of the population in Indonesia. The construction project is the process of converting plans or designs and specifications of planners into physical structures and facilities. Success in carrying out construction projects, namely projects that have effective time, economical costs, and good quality are the goals and expectations of project owners and contractors. In practice, many parties are involved in construction projects, this can potentially cause problems in implementing the project. The larger the size of a project, the more complex the mechanism, which means more problems to deal with. If the project is not handled