This is No Small Plans, a series where we highlight some of Dwell’s best floor plans for real, practical inspiration.

These conversions show how an unused garage can add some extra square footage to your home—or be converted into an entirely new one.

With the addition of a mezzanine level and a more open floor plan, the apartment became an adult duplex, with a living area, a bedroom with dressing room and bathroom, and a galley kitchen. “By ...