Oxford Archaeology (OA) undertook a trial trench evaluation within the ground floor of 51a St. Giles', Oxford prior to the proposed redevelopment of the site. After removal of floor coverings in the 'Dining Room' the area was scanned with a cable avoidance tool (CAT). Floor boards and their supporting joists were then removed from a wider Lshaped area and a thin covering of dirt was cleared away from this area. The cleaning revealed structural archaeology in the southern part of the room but due to the presence of live services within this area the decision was made to amalgamate the two 1 x 1m Trial Pits into a single 2 x 1m Trench which was located running parallel to, and just inside the inside line of, the northern wall of the building. The position of the area exposed by the floor removal and cleaning as well as the trench location were surveyed in relation to the internal walls of the Dining Room. The trench was excavated using hand tools to an approximate level of 1m below the existing floorboards, and followed OAs general approach to excavation and recording. All structural remains were left in situ. Upon reaching a depth of 1.0m below current ground level (bgl), a hand auger was used to log the nature and depths of the underlying deposits. After monitoring and agreement from David Radford (OCC), the trench was backfilled with the arisings from the excavation. In February 2019, Oxford Archaeology were commissioned by Savills on behalf of St Johns College, Oxford to undertake a trial trench evaluation within a groundfloor room at 51a St Giles, Oxford. An area was cleared of floorboards and joists, and a thin layer of soil was removed, within which a smaller 2m by 1m trench was excavated. In situ deposits and structural remains dating to the Late Medieval / Early Post Medieval were encountered at an uppermost height of 63.25m OD, which was 0.22m below the existing internal floor levels. Hand auger holes reached truncated natural gravel at 62.22mOD, no indication of an overlying insitu loess was observed. A large northsouth orientated limestone wall foundation was revealed, abutted by a smaller limestone wall foundation running to the east. A dark greyishbrown homogenous humicrich deposit to the west of the wall (outside) probably represented mixed garden soils, whereas inside the structure less humic reddishbrown deposits indicated possible ground raising. No floor levels were associated with the structural remains. The internal and external depos...