The following text is from the original listed building designation:
HORSMONDEN LEWES HEATH TQ 73 NW 4/68 Lewes Heath II
House. C16 altered and extended c.1700 and early C19. Timber framed and clad with red and blue chequered brick on ground floor and tile hung first floor with plain tiled roof. Two storeys, basement and attic on plinth with bellcast to first floor and pulvinated moulded wooden eaves cornice with tripled modillions to half-hipped roof with central stack and 2 gabled dormers. Roof stepped down to right and gabled with end right stack. Regular fenestration of 5 cross windows on first floor and 4 on ground floor with central door of 2 moulded panels in bolection moulded surround with oval fanlight and pedimented hood on brackets. Basement openings to left. Rear wings finished in same materials/detailing. Interior: large scantling frames with gunstock jowled main posts in rear wings of at least 2 builds, both at least C17 or earlier. Front range with later frame and queen post roof; earlier features of this range include mullioned window exposed in rear wall and inglenook initialed I.B. (a fireback in the house bears the arms of John Browne of Horsmonden, gunfounder to Charles I and the Commonwealth and greatest of the C17 iron masters of the Weald).
Listing NGR: TQ7037340766

Building survey undertaken by Archaeology South East in 2006. It is assumed that there was a building on the site in the medieval period, but the present structure dates from the C17, in the form of a two-bay timber-framed building. The main range of the building dates to c.1710 and has a brick-built ground floor and a tile-hung timber framed first floor, and a slightly off-centre brick chimney. A large timber-framed stair turret stands behind the main range. A lean-to formerly stood to the east of the stair turret, and may have been built at the same time. In the late C18 an extension was added to the west of the main range, which was largely rebuilt in the C20. A second lean-to was located to the rear of the building, which was built sometime before 1870. In the mid C20 both lean-tos were removed, and the chimney in the C17 structure was rebuilt against the west wall of that structure. A conservatory was added in the late C20. (1)

English Heritage, List of Buildings of Special Architectural or Historic Interest (Map). SKE16160.

<1> Archaeology South-East, 2006, A Revised Archaeological Interpretative Survey of Lewes Heath House, Horsmonden, Kent (Unpublished document). SKE17097.