The eating parlour at Headfort was created by knocking together two rooms in the south-east corner, on the ground storey of the house, and the two rooms above on the first storey, thus forming a large double cube. Presumably owing to its size the room was used as a ball room during the nineteenth century.

The unexecuted ceiling design shown in Adam volumes 12/96-97 makes use of segmental vault similar to that in the library at Kenwood, or the second drawing room at 20 St James's Square. The proposal to include a vault was abandoned, most likely in favour of economy.

Within the drawings collection of the Yale Center for British Art at New Haven there is a quarter drawn copy of drawing Adam volume 12/96.