Within construction, roles are generally thought of in terms of a division of labour, tasks and responsibilities, established through contractual and/or cultural relations. Moreover, roles are also presumed to be relatively stable. Drawing upon actor network theory, roles are re‐conceptualized and it is argued that roles are emergent and that they depend upon the tools and devices with which the project managers are equipped. A case study of the construction of a skyscraper, the ‘Turning Torso’, in Malmö, Sweden highlights the hybrid role of project management. In some instances project management may act as a mediator having qualitative effects on the project while in other instances project management may only be an intermediary, merely speeding up the process by conveying the concerns of others. The concept of qualculative project management is introduced to account for this emerging hybrid role. The analysis shows the ways in which the budget and other devices participates in enacting a qualculative role for project management, while simultaneously being involved in negotiating boundaries between professional roles in construction as well as the qualitative and quantitative properties of the building.Roles, emergence, construction process, project management, budgeting,