Search online or in newspaper ads for wood that can be reclaimed from old barns, houses or commercial structures such as warehouses. Choosing reclaimed wood from buildings that have been dismantled is an effective choice for eco-friendly building, especially since it does not require the cutting of new trees for a source of wood. You can also potentially save more money by offering to tear down the old structure in exchange for keeping the old wood.
Purchase wood from managed or certified forests. Those that have been certified are required to meet certain qualifications of sustainability, including the protection of wildlife habitats and old-growth trees. Bamboo and cork are common types of building products grown in this manner.
Find vendors that have already done the work for you. Across the U.S., there are those that are in the business of recycling and salvaging wood and then turning it into eco-friendly building products, from precut lumber to flooring.