This research examines the critical success determinants of startup companies in the constructionrnindustry. The purpose of the study is to determine to what extent the different Critical SuccessrnFactors affect the success of startup construction companies in Ethiopia. The study reviewsrndifferent literatures related with startups and different categories of critical success factors. Therngoal is to determine which critical factors highly affect success of startups established after thernyear 2006 E.C, registered in Addis Ababa and in the category General Contractors 5 and above.rnQuestionnaires and interview were used for the purpose of data collection. High level statisticalrnanalysis i.e. inferential statistics and hypothesis testing were used for the analysis of the datarncollected. The result of the analysis suggested that the critical success factors related withrnsuccess of startups are indeed the deciding factors over success or failure. Finally the paperrnrecommendswhat company owners/ general managers of startups in the construction industryrnneed to do regarding the success of their company.