An archaeological evaluation was carried out on land at the rear of Batt House, 56 Westgate Street, Bury St Edmunds prior to the construction of a single story extension. An 11.5m trench was excavated diagonally across the site of the new building. This revealed two shallow gullies aligned parallel to the street frontage and a probable pit. The gullies are interpreted as redundant property boundaries. All were sealed by a reworked post-medieval soil deposit interpreted as a garden soil. The only evidence for medieval settlement was a single sherd of medieval pottery recovered during machining.