ABSTRACT
The construction industry plays a pivotal role in the economic and infrastructural development of nations, contributing significantly to their GDP. However, construction projects are often plagued by cost overruns, despite efforts to enhance sustainability and cost efficiency. Design changes emerge as a prominent factor contributing to these cost overruns. This study aims to investigate the prevalence of design changes in construction projects within Edo State, Nigeria, and their impacts on project cost delivery. Drawing upon existing literature, this research identifies various factors leading to design changes, emphasizing their significance in project outcomes. Through the formulation of questionnaires and data collection from respondents in Benin City, Edo State, the study examines the frequency and extent of design changes in construction projects. Additionally, it evaluates the direct impacts of these changes on project cost delivery, providing insights into the challenges faced by stakeholders in managing construction expenses effectively. The objectives of the study include identifying factors causing design changes, assessing their occurrence levels, and evaluating their impacts on construction project cost delivery. By focusing on a specific geographic location, the findings offer localized insights that can inform decisionmaking and strategies to mitigate the adverse effects of design changes on project economics. The impacts of design changes on construction project cost delivery were evaluated based on respondents' perceptions. Rework due to purchasing new materials and labor, increased costs from extended project schedules, and waste resulting from demolition were identified as having major impacts on project economics. Overall, the findings underscore the significant influence of design changes on construction projects in Edo State, emphasizing the need for proactive measures to mitigate their adverse effects. By understanding the root causes and consequences of design changes, stakeholders can implement strategies to enhance project efficiency and cost-effectiveness, ultimately contributing to the sustainable development of the construction industry in Nigeria.
