This compact cottage for an owner-builder couple in Berkeley is located in the backyard of an existing house. The project was a challenge due the small size of the yard, the close proximity of surrounding apartment buildings, and the required legal setbacks. With a total livable space of 850 sq. ft., the cottage interior feels spacious, and the bale walls create an aura of privacy in a densely populated urban area. This is Berkeley's first straw bale project..