Gabion Walls Installed at Greenfab Model Home Site in Seattle. Greenfab’s current project, located in Seattle’s Jackson Place neighborhood, is the first prefab, modular constructed home targeting LEED for homes Platinum and Built Green 5 Star+ This demonstration home is the brainchild of Greenfab, a provider of sustainable, affordable and well-designed homes and communities with the long-term vision to encourage mainstream use of modular construction to provide healthier homes at a more affordable price point. Currently under construction, the demonstration home will be open for tours for a limited time upon completion. As this first Greenfab project continues construction, we are dedicated to updating you often on the process, progress and lessons learned.