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In the cobblestoned center of Andermatt, Switzerland, renowned for its skiing, locals Al and Francesca Breach scooped up a cottage dating from 1620 that they hoped to transform into an office with a ground-floor wine bar and guest accommodations. Although it was reimagined for contemporary living, it is graced with inviting old touches, like an original stone oven that still provides heat.

This 3,200-square-foot structure was assembled with a prefabricated foundation, concrete panel siding, and efficient built-ins, minimizing construction debris and toxins—such as concrete foundation tar—on the site.

A section shows light penetrating into the quadruple-height volume.