Different actors with different work practices, behaviours and culture are currently implementing BIM in temporary projects, networks and alliances. In this change process, public clients are increasingly being promoted as the drivers of change via their ability to demand BIM in procurement. Thus, understanding public client's BIM implementation from a sociotechnical context is important. The Social Construction of Technology (SCOT) allows for such an understanding. SCOT holds the public client, together with contractors, consultants, educators, etc, form relevant social groups that form the social constriction of BIM. Public client fill a particular important role in the social construction of BIM due to their large influence on the other social groups. A large Swedish public infrastructure client recently implemented BIM with the specific aim of driving industry change, innovation and productivity (SOU 2012: 39, Trafikanalys 2015). This study aimed to understand the role and impact of the public client in the social construction of BIM in the Swedish AEC industry. For this, the sociological explanation for BIM at the public client needed to be understood. The findings showed that there are currently two conflicting sociological explanations for BIM that are being socially promoted at the public client (one accepting the implementation as a means for driving industry change and one rejecting it). These conflicting sociological explanations had two different implications for the public client's role and impact in the social construction of BIM.