The service wing is located at the southwest corner of the building, the southern part of its west range, and was built in the late thirteenth century.
The wing is largely timber-framed.
On the ground floor in the southwest end, the wing seems to incorporate a stone wall of an earlier structure, in which lateral chimney stacks have been built with fire places dating from the nineteenth century.
The plastered stone wall on the west side, which is of timber above the first floor, was an underbuilding for an overhang.
This wall consists of large ashlar blocks suggesting that that was done between the fifteenth and seventeenth century and it had a three-light Perpendicular window.
Its timber-framed north wall also supports the framework of the great hall situated north of the service wing.
The south wall of the great hall and north wall of the service wing are connected on the first floor, but not on the ground floor, creating a covered passage which originally served as The Abbey's main entrance.
The dormer roof between the truss of the great hall and the service wing is done in a thirteenth-century technique.
The roof of the service wing itself, however, is post-medieval.
Today, the service wing houses accommodation and a meditation room.

The great hall was originally timber-framed and integrated with the contemporary service wing.
It was cased in stone between 1320 and 1340 to prevent deforming of the base crucks under shear stress.
The hall has two equal bays and the four two-light windows have been replaced in the twentieth century by three-light Perpendicular windows.
The stonework of the northeastern doorway was largely renewed in the nineteenth century.
It has wave-moulded jambs, voussoirs and an ogee-scroll hood mould.
The original southern doorway was less important and similar in style, but with chamfered jambs.
The northern end of the east wall abuts the north range with a straight joint, while the joint of the north range with the west wall is obscured by plaster.
The doorway in the east wall has been rebuilt in brick.
The west wall of the hall is castellated and probably early nineteenth century.
The great hall survives open to the roof, with one cruck truss carrying a king post which is unique in that a ceiling has never hidden it.
The workmanship of the timber structure is of exceptional quality.
The main timbers are made from very large trees carefully sawn to avoid waney edges.
All four posts have been made from the same tree.
The structure has nineteenth- and twentieth-century renovations.
The great wall has a wooden floor and can accommodate up to sixty people seated.
The service wing is located at the southwest corner of the building, the southern part of its west range, and was built in the late thirteenth century. The wing is largely timber-framed. On the ground floor in the southwest end, the wing seems to incorporate a stone wall of an earlier structure, in which lateral chimney stacks have been built with fire places dating from the nineteenth century. The plastered stone wall on the west side, which is of timber above the first floor, was an underbuilding for an overhang. This wall consists of large ashlar blocks suggesting that that was done between the fifteenth and seventeenth century and it had a three-light Perpendicular window. Its timber-framed north wall also supports the framework of the great hall situated north of the service wing. The south wall of the great hall and north wall of the service wing are connected on the first floor, but not on the ground floor, creating a covered passage which originally served as The Abbey's main entrance. The dormer roof between the truss of the great hall and the service wing is done in a thirteenth-century technique. The roof of the service wing itself, however, is post-medieval. Today, the service wing houses accommodation and a meditation room.
The great hall was originally timber-framed and integrated with the contemporary service wing. It was cased in stone between 1320 and 1340 to prevent deforming of the base crucks under shear stress. The hall has two equal bays and the four two-light windows have been replaced in the twentieth century by three-light Perpendicular windows. The stonework of the northeastern doorway was largely renewed in the nineteenth century. It has wave-moulded jambs, voussoirs and an ogee-scroll hood mould. The original southern doorway was less important and similar in style, but with chamfered jambs. The northern end of the east wall abuts the north range with a straight joint, while the joint of the north range with the west wall is obscured by plaster. The doorway in the east wall has been rebuilt in brick. The west wall of the hall is castellated and probably early nineteenth century. The great hall survives open to the roof, with one cruck truss carrying a king post which is unique in that a ceiling has never hidden it. The workmanship of the timber structure is of exceptional quality. The main timbers are made from very large trees carefully sawn to avoid waney edges. All four posts have been made from the same tree. The structure has nineteenth- and twentieth-century renovations. The great wall has a wooden floor and can accommodate up to sixty people seated.
The Abbey, Sutton Courtenay