The advantages and disadvantages of Building Information Modelling adoption have been extensively investigated in available literature. However, the focus of previous studies has been placed mainly on BIM adoption in relatively large organizations and little effort has been made to investigate the effects that the size of the organizations may have on the BIM adoption process and its associated costs and benefits. This study aims to identify factors that affect the BIM adoption process in small and medium size construction organizations (SMOs) in terms of adoption motivations, ease of implementation and organizational competency. Quantitative and qualitative information are collected through survey and face-to-face interview of construction SMOs in Australia. Structural Equation Modelling is used to quantify the relationships between influential factors and organization?s intention towards BIM utilization. The results presented in this paper aim to provide an insight into the needs and concerns of SMOs with regards to BIM adoption.