Features relating to 5 phases of medieval occupation were identified at 11-14 Guildhall Street, Canterbury. These features included walls, floors, a pit, and the excavation of two cellars (which may have occurred during the early post-medieval period).
The first phase of occupation comprised the construction of a wall and a floor. The wall was aligned NE-SW and represented two phases of construction on the same wall, the first phase comprised a chalk and dressed Caen stone wall standing to a height of at least 0.29m. The second phase of construction comprised the capping of the first wall by a second wall constructed of chalk and flint, standing to a height of 0.75m. The wall is thought to represent a continuation of the frontage to the Cheker of Hope inn, which was identified during an earlier watching brief nearby. The walls were associated with a mortar floor surface with a minimum thickness of 0.20m. This phase of occupation is thought to date from around 1392-1395 AD - due to a comparison with the dates of material from the Cheker of Hope inn excavations.
The second phase of occupation comprised the cutting of a rubbish pit, and the build up of dump deposits within the building. The pit measured 0.73x0.60x0.39+m, and contained oyster shell, carbon, and pottery dating between 1250-1350 AD with some material potentially dating from as late at 1450 AD.
The third phase of occupation comprised the construction of another floor surface over a possible occupation/dump horizon. The floor was around 0.04-0.09m thick and contained abundant oyster shell fragments, chalk flecks, and carbon, alongside pottery dating between 1225-1350 AD.
The fourth phase of occupation comprised the construction of a chalk and flint partition wall which abutted against the face of the phase 1 wall and stood to a height of between 0.17-0.29m. Another floor surface measuring 0.14-0.16m in thickness was created against the NE face of the wall. Overlying this floor was an occupation layer containing carbon and oyster shell, which in turn was overlain by a second floor surface measuring over 0.03m in thickness.
The fifth and final phase of occupation comprised the initial abandonment of the room/building, associated with a layer containing possibly residual medieval pottery (1225-1350 AD). This was followed by the cutting of two foundation trenches which were associated with the construction of cellar walls to the NE and NW of the excavation area. Both of the walls still survive today and are aligned NE-SW; one was constructed from chalk, flint, and brick, capping two courses of stretcher bonded bricks, the other comprised a single course stretcher bonded brick wall. The first wall was capped by successive mortar consolidations and sealed by a Victorian shop front floor mosaic. One of the foundation trenches contained a residual sherd of medieval pottery dating between 1375-1525 AD. (1)
The location of the site is unclear as in the site map it appears to front onto Mercery Lane, whereas on the modern OS map, 11-14 Guildhall Street appears to be located away from Mercery Lane.

<1> Canterbury Archaeological Trust, 2002, Archaeological watching brief at Debenhams (Main Building), 11-14 Guildhall Street, Canterbury (Unpublished document). SKE30823.