The processes of environmental factors are milieu-focus, which can influence the knowledge sharing in construction organization. This study examines the possible effect of environmental factors in respect to managerial leadership, strategy/planning and culture on the relationship to the knowledge sharing. The study was carried out on project managers in construction organizations in Nigeria using a stratified random sample of 323 of different designations. A hypothesized model of knowledge sharing, and environmental factors was tested using structural equation modeling approach, and a proposed model was therefore developed. All the factor loadings were significant, leading to a prudent model achievement. The study serves as a guide to the construction managers for sharing knowledge in the construction organization. The finding indicated that environmental factors demonstrated significant influence on knowledge sharing.