From the backyard, the addition can be seen for what it is: a tasteful expansion that leaves the dignity of the house intact. At ground level, a new flagstone patio defines the base of the addition. Above that, the kitchen’s big window expands into a rectangular bay. “It has the feeling of a box that’s hovering above the ground, and the second floor addition reads like another box above that,” Tremain explains. “It’s a very contemporary addition, but the materials and the details marry it into the old house.”Craig A. Williams