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"They wanted the house to patina and grow with them," says Bryan Bethem of the clients. "It will change from year to year as the wood weathers and ages. It will grow along with the family."

Keeping the roofs flat in appearance was key to maintaining the character-defining feature of the home -- despite the fact that it got new insulation, new drainage, and new solar panels.

face east and west, making the garden room a solar clock, constantly reflecting the time of day.

The Cottle house was designed by Bruce Sutherland in the Arapaho Hills, a landmark community listed on the National Register of Historic Places.

Tearing out shag carpeting, the home now features original, restored cork flooring.

With 600-square-foot of indoor living space and an additional 557-square-feet of covered outdoor living spaces, the prefab project represents a nearly a 1:1 ratio of heated/indoor to unheated/outdoor areas.

With 600-square-foot of indoor living space and an additional 557-square-feet of covered outdoor living spaces, the prefab project represents a nearly a 1:1 ratio of heated/indoor to unheated/outdoor areas.

Architecture firm Wittman Estes has been tracking performance metrics for the net-zero energy prototype project.

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Architect Thaddeus Longstreth worked on the Kaufmann House before building this post-and-beam brick home surrounded by wooded paths in New Jersey.

Thaddeus Longstreth, a student of Neutra's, designed the home for pioneering physicist Roger Dashen.