The three-gable carriage house was built shortly after Dr. John Nugent purchased the property in 1889 to house carriages and servants. The second floor was finished with two dormer windows facing south to create two bedrooms, and a common room, with a large picture window on the east. Originally a land ramp was built from the double door entrance on the first floor, extending down about 100 feet to Meeting House Lane. The Museum probably added an extension on the north side to house a whale boat and collections of farm equipment in the 1950s.