Passive design is about ensuring that the fabric of the building and the spaces within it respond effectively to local climate and site conditions in order to maximise comfort for the occupants. Using passive design principles can reduce temperature fluctuations and make a home drier, quieter and more enjoyable to live in. As building regulations develop and public awareness of sustainability issues increases, home buyers are increasingly likely to demand elements of passive design. A number of passive design features can be incorporated into the new buildings or renovations at little or minimal cost. Level's website provides info on achieving passive design principles.