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Madison points out that the pod concept would make it easy to add an extension if necessary. “We see it as a house that can grow with us—and that we can pay for as we go along.”

The front and back doors are only 12 feet apart from one another, separated by the living space at the heart of the home. The open floor plan allows the living space, den, dining room, and kitchen to flow into each other, while the way the volumes are positioned makes each space feel distinct—this works well for entertaining both large and small groups.

The Plus House—named for the perpendicular trajectories of light and air that pass through on the top and bottom floors—is one in a series of architect-designed homes commissioned by Arkitekthus, a development company founded five years ago with a pledge to improve the quality of prefab architecture. The spruce panels that coat the second-floor exterior will fade in tandem with the zinc-coated steel that rims the glazed windows and doors. "They will go gray like we do," says architect Claesson Koivisto Rune.