Employing the same materials and basic design as the mansion, this large, H-shaped combination carriage house and servants' quarters is typical of service buildings attached to houses of High Gate's magnitude. It was used as a nursing home for a number of years and was threatened with demolition in 1988. When it became known that a fast-food franchise planned to occupy its site, interest in its preservation galvanized. The Friends of High Gate, Inc., now own the building and use it for exhibitions and receptions.