Solomon Markos (PhD)Natnael Agonafer2025-08-112025-08-112024-06https://etd.aau.edu.et/handle/123456789/6319The construction sector is an important part of every country's economy since it creates jobs and wealth. However, many initiatives in underdeveloped nations had poor results in terms of time and money. Design change, among other variables, is one of the causes of this poor performance. This is because design changes might impact project costs and timelines. With this background, the goal of this study is to determine the existence and prevalence of design changes, to identify the causes of these design changes and their impact, to determine which contracting party is more responsible for initiating these design changes, and to determine who is most affected as a result of these causes. The research is conducted on a project located at Addis Ababa which is owned by Addis Ababa Housing Development Corporation. Among different projects that are undertaken by AAHDC this research is focused on one project, The Bole Ayat One Project, which consists of three building construction sites under it. The study finds that Client related factors, Design related factors, Managing consultant-related and Site – related were found significant in causing design changes the study concludes that design change as one major problem in building projects in Addis Ababa city on the project of Bole Ayat One. Key Words: Change of design, Client related, consultant related, contractor related, Design related, building projecten-USThesis