This paper presents a BIMAsset Maturity Model (BAMM) which demonstrates how asset owners can appraise the maturity of their organisations in relation to their capability of realising Building Information Modelling (BIM) business value in Asset Management (AM). The study aims to develop and enhance the understanding of asset owners in relation to techniques of appraising key business processes that help derive BIM business value during asset operations. The study utilises a qualitative multi-case study strategy to develop a maturity model that is specific to the domains of BIM, AM and value realisation management. Also, this study adopts an inductive approach using semi-structured interviews to collect data. Furthermore, an expert panel in the form of a focus group is utilised to validate the BAMM. This study finds that the ability of asset owners to derive BIM business value during asset operations has maturity implications in relation to certain key business processes. Furthermore, the study reveals that business value can be derived by the asset owner if organisational processes such as BIM strategy, contract management, lifecycle management, maintenance management, work-order management and value realisation management are effectively executed and continuously improved to an advanced stage of maturity. An important contribution of the paper is that it presents a novel approach for evaluating owner-operator organisations using the BAMM from two perspectives; AM business processes (BIM strategy, contract management, lifecycle management, maintenance management, work-order management and value realisation management); and BIM governance dimensions (people, process and technology)