While the paradigm of sustainable development has largely influenced architecture projects worldwide, Green Building Certifications (GBCs) have become the new (increasingly mandatory) standard of project performance. Numerous studies have concentrated on the influence of sustainable development (SD) in the final product: the building. However, more research is still needed in order to understand how GBCs have influenced building processes, particularly collaboration and innovation within architecture projects. In order to fill this gap, this study presents results from 19 interviews with professionals in the built environment and examines three architecture projects conducted in Canada that received a widely popular GBC and were significantly influenced by SD principles during the design and building process. The research applies recent frameworks for exploring stakeholders' interests on GBCs and the collaboration and innovation practices developed by them. Research results show that processes within these projects are shaped by at least four tensions that can either enhance or hinder collaboration and innovation: strategic-tactical, collaborative-competitive, participative-effective and individual-collective. The study highlights the importance of understanding GBC as a process and not only as a final outcome, and thus, to better manage these tensions so that they contribute to product and process performance.