Digital transformation is often conceptualised as an accomplished event; however, conceptualising it as something that organisations accomplish does not capture the features of the change process. In this study, we analyse digital transformation at the inter-organisational level (i.e. construction projects context) and conceptualise it as a dynamic change process that people enact. More specifically, we investigate the implementation of building information modelling (BIM) in construction projects, adopting a practice-based approach to explore the change process and how BIM is institutionalised in practice. We propose a preliminary conceptual model of the institutionalisation of BIM as a structuration process. Based on ethnographic data, our findings revealed two main characteristics of the process of institutionalising BIM in projects, i.e. path dependency and contingency upon institutional fields. Through our findings, we offer insights into both the literature and practice on how digital transformation in project-based contexts occurs in practice.