Sited near to the southern approach to the castle, the impressive Great Barn stands amid several other estate buildings. Constructed of limestone rubble, the Barn is reputed to have been built by Walter Strickland in the 1560’s. This early example of a two-storey Lake District bank barn features stone chimney stacks, flattened arched heads to either side of the projecting central block with recessed arch which is surmounted by a lead cupola. A bank barn houses animals at ground level and hay and grain are stored on an upper level which is accessible from a ramp or a bank. In 1569 ‘the new barne’ contained wheat, barley and oats together with a large number of agricultural implements. The Barn measures over 100ft in length and has two ramps and two sets of double doors to the upper level. The Great Barn is now converted to houses and is Grade II* Listed.
To the west of Lanercost Priory stands the remains of the inner arch of the priory gatehouse. Forming a link between the outside world and the canons inside, the surviving part of the outer gatehouse above would have faced into the precinct and the building would have extended to the edge of the road. Dating to the early 13th century, the gatehouse was constructed of squared calciferous sandstone and coursed rubble which was taken from the nearby Roman wall. The gatehouse remains feature a chamfered segmental arch of three orders, hood mould and moulded corbel stops with fragments of fan vaulting. The current gates reflect the Arts & Crafts interests of George Howard, ninth Earl of Carlisle, who erected them during his restorations. The surviving inner arch of the gatehouse is Grade I Listed.