Following the submission of a planning application for various alterations to Oxendale Hall Barn, Osbaldeston, a condition was placed on the decision notice following consultation with the Lancashire Archaeological Advisory Service requiring that a record of the building be made beforehand to better understand its historical development and significance and that groundworks associated with the development be monitored. Following the provision of a project design by Greenlane Archaeology the building recording was carried out in September and the watching brief was conducted in October 2017. Oxendale Hall Barn, Osbaldeston is Listed Grade II* and of c1600 construction. The core of the building comprises a timber-framed structure supported by four full height cruck trusses, including a closed one against the north elevation, and a tie beam truss to the south. The timber barn was subsequently clad in stone in a number of phases, initially probably intended to support the south end where this had failed, and later to enlarge the barn for additional cattle housing. The building also saw some modification in the later 20th century after it had ceased to be used for agricultural purposes. Finds from groundworks undertaken inside the barn were all post-medieval in date and an 18th or 19th century date is suggested for a series of stake holes at the north end of the barn, which could indicate that it was partitioned at one time, perhaps for keeping livestock. Some features and deposits from the area excavated to the south side of the barn perhaps relate to a structure built in approximately this location between 1910 and 1930 and subsequently demolished, but no courses of brickwork remained and plastic sheeting and the presence of flexible plastic drains show that much of the material removed during the course of the groundworks was of modern derivation.