This project took both a conceptual and modeling approach to measuring the impacts of extensive green roofs on select commercial developments in Cambridge, ON, Canada. The methodologies used to illuminate the impacts were (1) literature review, (2) the specific geographic context of Cambridge, and (3) the use of the Green Roof Energy Calculator. Two contrasting scenarios of different growing medium of 6.35cms and 10.16cms were inputted into the model, resulting in minimal monetary savings of approximately $130/annum but large avoided kWh usage of between 1500-1800 kWhs/annum. Furthermore, the model showed that the green roofing scenarios pulled in additional heat from the urban environment, reducing the urban heat island effect. Additionally, both green roof scenarios were modeled at retaining between 45-49% of the annual precipitation which greatly reduces the flow of contaminants from the urban surface to waterways. Therefore, green roofs may further sustainable development efforts and should be further explored for the Cambridge context.