Evaluation by trial trenching in advance of redevelopment, by G R Pattison of SCAU for Surrey County Council, revealed two medieval ditches, possibly early field boundaries, and an undated hearth and gully.

Observation by D W Williams for the Hygate Partnership of the digging of foundation trenches revealed a stone wall probably dated post 1800 with an associated chalk surface. Beneath this surface deposits of late 12th/early 13th century date were found. (280)

Evaluation in advance of proposed groundworks, by Graham Hayman of SCAU for Reigate & Banstead Borough Council, confirmed that the moat embankment is of relatively recent construction, but that it had buried a 13th century bank of roughly similar alignment.

Evaluation in advance of a new access road to the rear of the High Street, by Graham Hayman of SCAU for Reigate & Banstead Borough Council, located a shallow ditch orientated north-south. No finds were recovered from the ditch, but it was sealed by a layer in which a few sherds of medieval pottery had been found.

Barrel-vaulted structure identified as the remains of a medieval undercroft by GMVEU. (282)

Several features identified by GMVEU during building works, including four pits and a ditch containing 12th to 13th century pottery; a mid-13th century well; a 17th century brick-lined kiln and other evidence for industrial activity; 18th and 19th century pits. (282)

Test excavations in advance of alteration and extension of the buildings, by Graham Hayman of SCAU for Triggs Turner Investment Co, recorded several pits and some walling of 17th-18th century date. Beneath these features, pits, postholes and stake holes of late 12th-early 13th century date were found. The majority of the pits had been used for domestic rubbish disposal. One very large feature is presumed to have been produced by quarrying for chalk. Levelling into the slope for building had truncated features towards the rear of the site.

Chalk block wall 1.25m wide recorded by GMVEU in gas main trench. The wall was possibly the same as another noted by contractors on the western side of South Hill. The possibility of the wall being part of the castle bailey wall is discussed. (283)

Observation of swimming pool construction by GMVEU located the probable bailey ditch of the castle. It was about 6m across and over 3m in depth. (282; 283)