Built before 1783 and enlarged about 1840, it is a well-preserved 18th-century Cape with added Greek Revival features, and one of Harpswell's few surviving pre-Revolutionary War buildings.

It is a single-story wood frame structure, with a side gable roof, a large central chimney, five-bay facade, clapboarded exterior, and a foundation of concrete and rubblestone.

The interior has a typical center-chimney plan, with the entry vestibule housing a narrow and steep winding staircase, with parlor spaces to either side, and the kitchen behind.

Tarr was a veteran of the American Revolutionary War, and is also recorded as operating a tavern in the town and serving as its constable.

The house and two acres were given to the Harpswell Historical Society in 1982, which resold it into private ownership with protective covenants.