This 3.5 storey 3-unit townhouse urban infill development is part of the Canada Mortgage and Housing Corporation (CMHC) EQuilibrium Sustainable Housing Demonstration Initiative, a pilot project involving the development of 12 award winning net-zero energy homes. The infill development addresses the multi-faceted goals of sustainable design, not the least of which includes the goal of urban intensification, an important aspect of sustainable planning. The project comprising three townhouses of approximately 2,350 sf (220 sm) and 2-4 bedrooms, depending on the configuration. The homes are designed to produce as much energy annually as they consume and, connected to the electricity grid, draw power only as needed ? they can also feed excess power back into the system. To achieve net-zero self-sustaining homes, the units the will incorporate energy-efficient features such as air tight, highly insulated and energy efficient building envelopes with advanced windows and glazing, and will be fitted with Renewable Energy Systems including; solar domestic hot water and photovoltaic panels covering the roof of each unit; ground source heat pump; along with high efficiency heat recovery ventilators. Placing the main living spaces on the upper levels and providing an abundant source of natural lighting to those parts of the townhouse most occupied during the day will offset the lighting associated energy demand of the units.