This paper examines the influence of Project Management Factors on Building Performances in Lagos State of Nigeria. The study specifically investigated the relationship and influence of Project Management Factors (Project Manager and Team Competencies, Project Related Factors and Project Technicality). The survey research design was employed in this study. A well-structured questionnaire was administered on the respondents and used to elicit information on the relationship and influence of Project Manager and Team Members’ Competency, Project Related Factors and Building Performance and Project Technicality (PT) on Building Performance. Data was collected from building construction professionals which includes Nigerian Institute Builders, Nigerian Institute of Civil Engineers, Nigerian Institute of Quantity Surveyors and Nigerian Institute of Town Planners. A total of 367 samples were selected from the study population using the stratified sampling technique. Correlation and regression analysis were used to summarize the findings. The study found that there is a significant relationship between the Project Management Factors and Building Performance. Furthermore, the study found that Project Management Factors: Project Manager and Team Members’ Competency (t= 9.546, p<.05), Project Related Factors (t=4.506, p<.05) and Project Technicality (t=5.722, p<.05) influence Building Performance in Lagos State of Nigeria. Based on the results, the study recommends a critical project management approach in building construction while putting all the factors into considerations, and that Government agency involved in building construction should ensure all safety guidelines are strictly adhered.