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Building Information Modelling (BIM) has been a real revolution for the traditionally fragmented construction industry. Though BIM has emerged over a few decades, many users still find it challenging to utilise the exact benefits, especially in the aspect of design collaboration. Few scientific studies have been conducted in forming and enabling design collaboration environments in BIM projects. However, the impact towards project performance from BIM design collaboration is not addressed, which has hindered the practical applications and attainment of the benefits in construction projects. Therefore, this study attempts to understand the means of successful utilisation of design collaboration for improving project performance in a BIM-enabled environment. From the literature review, 12 project performance parameters were discovered. The level of design collaboration and their impact towards BIM project parameters were reviewed through the sequential exploratory mixed method. Initially, 8 semi-structured interviews and later a questionnaire survey were conducted. Findings revealed that the achievement of the design collaboration among different parties in a construction project differs, especially in terms of forming a BIM team, guidelines and management of a digital common data environment. Yet it is, found that many people have experienced a positive impact from design collaboration to project performance via BIM. Among all, digital coordination, project schedule performance, and stakeholder satisfaction record the highly influential project performance parameters. Further, a few strategies are proposed to identify barriers in achieving design collaboration for overcoming the challenges. The findings of this study promote BIM adoption for achieving positive project performance in the real.