How local is ultra-local? The Underhill residence was sculpted from the surrounding landscape. Its round timber structural system was sourced entirely from the adjoining 40 acres of forest, and its millwork came from local mills rather than lumber yards. The interior flooring and exterior stonework came from local limestone quarries, and its straw bale walls were formed from locally grown straw as well. With an earth-sheltered basement and sloping sod roof, it melts into the hillside.