The Gatehouse, including attached section of town wall at the rear

A 2½-storey 2-window house of pebble-dashed front with smooth-rendered quoins, steep slate roof, grouted to the rear slope and rear wing, with stack to the L heightened in brick against the later No 50 Castle Street, and end stack to a rear wing on the L (W) side of the house. The R-hand angle is rounded. The entrance is offset to the R of centre and has a panelled door in a reed-moulded and pedimented doorcase. Windows have smooth-rendered architraves. To the L of the entrance is a 4-pane horizontal-sliding sash window, and to its R is a later inserted 9-pane margin-lit window. In the upper storey are two 2-light casements (replacing earlier sashes) and two flat roof dormers have 2-light windows.

The rear has a late C20 1-storey projection against the main house, with balcony above. The rear wing has a lower ridge line and was extended in the C20. Both original and later sections have replacement upper-storey windows. The main range has a small casement in a flat roof dormer L of centre, to the L of which is an added large dormer, also with flat roof.

Attached to the E side of the rear is a short section of the former medieval town wall, of rubble stone approximately 6m long and 5m high.

The main range is now a single room, and has a joist-beam ceiling with 3 cross beams, all chamfered with run-out stops. The fireplace to the L of the entrance has a big timber lintel. The original back door, now within the added 1-storey projection, has chamfered stone jambs (possibly salvaged from the earlier gatehouse near the site) and a stone lintel of different character. The dog-leg stair has a square newel and some fretwork balusters, probably of the C18, but otherwise has been entirely rebuilt. A former stair window has been blocked, probably when the adjoining No 50 Castle Street was built. In the upper storey are 2 cross beams, and a corbel against the L gable end that was possibly salvaged from the earlier gatehouse. The roof has one collar-beam truss with raking struts. Original purlins were removed and replaced when the eaves were slightly raised, giving a roof of flatter pitch. The rear wing, in the lower storey, has a single spine beam and a rough timber lintel over the fireplace.