The sheep drying shed was built in the late 1850s specifically for washing, drying and grooming sheep for agricultural shows, and forms a part of Leighton Farm, the model farm on the Leighton Estate owned by John Naylor from 1846-47.

The sheep shed is built on a sloping site and consisted of a single-storey shed with a basement, and attached walls on the north and south sides, although there is no evidence now of a former stone-lined dip said to have been used for washing the sheep. The shed is built of brick with random rubble basement walls and has a slate roof with coped gables on moulded kneelers and with a brick stack behind the west gable. The front of the building faces east and has two round-headed doorways, fitted with boarded doors with sunk iron handles and overlights. Above the doorways are ventilation holes in 3 stepped lozenge patterns. The south wall has a stepped, white-brick, plinth and to the right is a blocked doorway under a segmental head. The north wall has a similar blocked doorway to the left, and a buttress at the north-west angle. In the west wall are two central, equally-placed, round-headed windows incorporating casements, flanked by similar windows under segmental heads. Above are more ventilation holes in lozenge patterns similar to those on the east wall. Beneath, the basement has 3 buttresses with a pronounced batter. To the left and right are doorways under dressed stone lintels with sliding boarded doors on externally placed horizontal runners.

Internally the sheep drying shed has been modernised during conversion to business premises, with the insertion of internal partition walls and a staircase to the basement. From the basement slate slabs within the floor are visible, with drilled apatures allowing the warm air from the heating elements in the basement to rise to the sheep above.

A sheep run is bounded by walls on the south side of the Drying Shed. The walls of this are built of random rubble with dressed copings, and are curved on the east and south sides. In the east wall are 2 octagonal piers with pyramidal caps which define the original gateway, while a later, wider opening has been cut through the wall further south. The west wall is buttressed on its external face, has some brickwork in its inner face, and has an inserted field-gate at the south-west angle. This gate defines the position of an inner, brick wall which survives only partially . From the north-east angle of the Sheep Shed is a short rubble stone wall ending in an octagonal pier with pyramidal cap.
(Source: Cadw listing database) RCAHMW 10th November 2008