This article provides an indepth look at the sustainable design toolkit used by the firm Orcutt Winslow Partnership (OWP) that is strongly committed to sustainable design. It explores the rigorous certification standards like LEED v4, WELL Building Standard and the Living Building Challenge that guide OWP in adopting and implementing different strategies for improving the performance of a design; the wide variety of tools that it uses in addition to its preferred BIM application, ArchiCAD, not just for energy analysis but for studying deeper technical aspects of building science such as product chemistry, computational fluid dynamics, embodied carbon, and life cycle analysis of materials; and additional workflow processes such as interoperability, custom schedules, and the use of templates.