Combining sustainable design and a rustic material palette, the Tumble Creek Cabin is a net-zero mountain retreat. The vacation home is nestled within Washington State’s Cascade Mountains. Known for its extreme winters, designers had to use a mixture of solar panels, passive solar strategies, and a Tesla Powerwall to allow the residence to operate off-grid. While the oversize sloped roof gives the exterior a modern silhouette, it also filters the sun during the winter and summer months to help heat and cool the house, while its large overhangs offer a sheltered outdoor area. The contemporary exterior is clad in stone, Cor-ten steel, and reclaimed barn wood to compliment the rugged setting. These materials were left exposed to the interior where faulted ceiling make room for open living spaces and a massive board-formed concrete fireplace. Vast expanses of glazing bring in the warm sunshine as well as affording views of the wooded landscape.