Using asphalt shingles, metal siding, recycled lumber, and oak flooring, Berkeley–based architecture firm Fernau & Hartman converted an old branch bank into a two-story residence in Clyde Park, Montana.

Built in 1910, the 20- by 50-foot building features an open floorplan with two separate lofts for the bedroom and office areas, a wood-burning stove, and a recreation space.

In the backyard, a private "guest house," or Airstream trailer, provides extra room for visitors.

DESIGN fernauhartman.com, Berkeley, CA (510/848-4480).