The Hammond–Harwood House is a five-part brick house with a five-bay two-story central block, two-story end wings and one-story connecting hyphens on either side. The central block has a shallow hipped roof. The wings project toward the street with three-sided hipped-roof bays. The hyphens are rendered as a blind arcade, with the central bay a door opening with a pediment above. There is little decoration, with plain rubbed brick flat arches over the windows. Ornament is confined to the central bay, whose door is framed by engaged Ionic columns and topped by a fanlight. Above the door the second floor window is framed with a surround and entablature.