for us sustainable design is about...
orientation, placement, scale and relationship to surroundings and ecology - the appropriateness of a building to to a site
type of materials used, composition of these materials, the energy required to make them & to put them together and to keep them together and whether the materials can be replaced and reused
a considered approach to resource conservation
… to create spaces that are comfortable and healthy and inspiring, both for those who use them and those who are affected by them