Buildings addressing energy efficiency, durability, life-cycle performance, occupant well being and productivity are known as sustainable, high performance buildings. Incorporating all high performance attributes to these buildings increase their complexity therefore, interdisciplinary integration is required in the project delivery processes. However, the literature was found to be lacking in terms of the guidelines to lead these processes. Literature also indicates that project delivery methods adopted (e.g. design-bid-build, design-build and, construction management at risk) can influence the level of integration achieved by a project. To respond to the need in the industry, this aimed to understand the extent of the effect of project delivery methods and practices on the level of integration achieved by the project team and further its effects on project outcomes with a focus on sustainability goals.

To achieve the study goals the research adopted a case study approach and qualitative methods of analysis. The findings suggest that strong owner commitment towards sustainability, early involvement of contractor, and early inclusion of green strategies are attributes crucial to the delivery process that can have potential effects on project outcomes especially on sustainability goals. The results were verified through external validation with previous research findings.