Map, Wrap, Gaps, Taps & Apps. This is my model for designing sustainable homes and creating a better place to live. If you're building new, start with 'Map' - where are you going to build and how is your site connected with the surrounding community and environment. 'Wraps, gaps and taps' are all about what your house is to be made of, starting with the all important thermal envelope. Finally 'Apps' is about how you operate your home. The model works in reverse for existing homes. For more, check out my podcast at http://homestylegreen.com/84