3. Hit the Recycling Center

Do-it-yourselfers can reap big savings with recycled or lightly used fixtures and building materials. Habitat for Humanity operates about 400 ReStores nationwide, which offer salvaged materials at half off home-center prices. One caveat: Many contractors won't work with salvaged items, or homeowner-supplied materials in general, because they don't want to assume the liability if something goes wrong. That said, if you're doing your own work, you can find anything from prehung doors to acrylic skylights to partial bundles of insulation. (To find a ReStore near you, visit habitat.org.)

Price of 4-by5-foot insulated window in a home center: $600

Price at ReStore: $300

SAVED: $300
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