Carthouse Range at Plas Heaton (with incorporated flat to first floor)

The Carthouse Range at Plas Heaton is a long 8-bay structure that includes domestic accommodation on the upper floor of its left-hand section. It is built of rubble with a partly timber-framed core, topped by a continuous slated roof that has a medium-steep pitch. The gable parapet is slab-coped and kneelered, featuring a simple brick chimney on the southwest gable. The left section of the building is the older stone part, which has two wide segmentally-arched cart bays with rough-dressed voussoirs and archrings. Above these bays is a 3-bay living space, accessed by an angled flight of stone steps with a parapet on the left. This living space has a boarded door and two small 4-pane 19th-century windows on the right.

The later stone section features a central raised segmentally-arched opening, flanked by two depressed arched openings, both of which have boarded loading bays for the loft above. To the far right is a modern opening with a similar loading bay. The northeast gable end has an external stone stair leading to an upper boarded door. The rear elevation reveals wall posts that relate to the original timber-framed structure.

Inside, there is a four-bay timber-framed structure incorporated within the stone building, showcasing three pairs of braced wall posts and pegged queen strut trusses of sub-medieval type.