This study evaluates the effects of project management on project success in Blackstone Construction Company. The study adopted a survey research design, using a combination of stratified and judgmental sampling techniques, A structured questionnaire was administered on 40 top and middle levels management staff of the company. The scales in the questionnaire were content validated, and has a reliability correlation coefficient of 0.11.The data collected was analyzed using descriptive statistics and Chi-Square distribution. The research findings reveal that there is a relationship between project quality and business success, Project quality and technical success. The study also reveals that there is a significant relationship between Project cost and acceptability by clients. It was therefore recommended among others that total project cost on the side of clients should be minimized by ensuring that the project manager is innovative enough and creative in the apportion of project cost without reducing the quality of the project.