A byproduct of any construction job, be it building from scratch or remolding, is that you'll have left over materials. A good contractor will know an environmentally friendly way to get rid of those left over materials without simply throwing them out. Getting a contractor who'll find a way to reuse those extra supplies will mean that he's truly committed to the green construction mission. One great way to reuse materials is to find an organization like the Habitat for Humanity's ReStore. The ReStore sells used or surplus materials that have come from previous construction jobs. A program such as the ReStore ensures that those excess materials are going to be put back into some sort of serviceable use instead of taking up space in a landfill [source: Habitat for Humanity].