Not all of a building’s sustainability has to with its construction. The patterns of occupation and use are also relevant. Naish says he designed his with garaging for only one car – a big and perhaps premature call for a three-child family (think of all those school drop-offs and sports fixtures). But he says, the goal of this self-denying design gesture is to get down to one car. And that is as meaningful move in a sustainable direction than any number of selfcomposting toilets.