Located in Mulmur, Ontario, this four-season house is sited in a valley facing the banks of a stream-fed pond. The long form of the house is nestled into the slope that rises to the north; the site is characterized by its abundant vegetation and a unique micro-climate for the area. A green roof angles back towards the hill and opens up to the south, extending the slope of the hill. Extensive 4.3 meter high south-facing glazing offers expansive views of the pond and the landscape beyond; lift-and-slide doors provide access to a full-length deck, integrating all living spaces with the outdoors during warm months. Cedar boards continue from the ceiling to the exterior soffit, which together with the cedar deck reinforce the house’s relationship with the exterior. Bedrooms are located on opposite ends of the rectangular plan, and the open kitchen and great room are situated in the heart of the building.