Richard Fitzhugh constructed Oak Hill on the historic Ravensworth tract in Fairfax County. A late Georgian-style wood-frame dwelling with weatherboard cladding, Oak Hill has a center-hall plan and stands two stories in height and five bays in width. The house was expanded about 1830 with the addition of a one-story, wood-frame wing that may have first been an outbuilding. Prominent restoration architect Walter M. Macomber significantly altered Oak Hill in the mid- to late-1930s with the addition of a full-height Colonial Revival portico. He also replaced the central entry with a historic Italianate round-arched door and molded surround. The historic property of Oak Hill, which was settled as a tobacco plantation late in the 18th century, is now nestled within a suburban Annandale neighborhood.