A pizza oven and built-in storage spaces line a hallway, saving space. "6,000-square-foot houses for single families don't make sense ecologically—or in my opinion, functionally," says Hirsh. "The house is a nice size for our life—plenty large, but not unwieldy."

Photo by Ron Johnson.  Photo 6 of 10 in A Serene, Sustainable Home in Colorado from Serene, Sustainable Home in Colorado

A Serene, Sustainable Home in Colorado

6 of 10

A pizza oven and built-in storage spaces line a hallway, saving space. "6,000-square-foot houses for single families don't make sense ecologically—or in my opinion, functionally," says Hirsh. "The house is a nice size for our life—plenty large, but not unwieldy."

Photo by Ron Johnson.