Greenfab designs and sells prefab, modular homes with an emphasis on healthy, energy-efficient, pre-designed or custom homes. From their headquarters in Seattle, Washington, they design and build homes throughout the Pacific Northwest, each with eco-friendly materials like low-VOC paints and finishes, insulation and windows with high R-values, and cost-effective mechanical systems. Many of their homes can also easily incorporate solar panels, and also include an energy-monitoring system to allow owners to collect and measure energy and water use.