Planned group of farmyard buildings at Cog Farm

Cog Farm features a planned group of farmyard buildings, constructed from rubble, with some sections limewashed and others covered with slate roofs or corrugated replacements. The layout consists of two yards divided by a central north-south barn, with transverse buildings facing the yards. These buildings include twinned hammels with cambered-arched openings, and the right range has a loft above.

In the left yard, there is a long stable range that runs at right angles, closing off the western side of the farm. This stable range was extended in the late 19th century and includes a two-storey gabled central bay with a dovecote. Another notable addition is a three-storey red sandstone gabled 'tower' block at the front, attached to the gable end of the central barn. This structure may have served as an engine house, with its robust construction likely intended to accommodate machinery for processing animal feed.

The right yard was previously covered by a modern shed, and the arches of the hammels are partly blocked. The loft openings above feature sandstone voussoirs. The eastern side of the farm is closed off by a cartshed and granary, which have cambered-arched cart openings along the east side, a loft above, and loft steps at the rear. Additionally, there is a further barn at the back, aligned with the main barn, which can be accessed from the front courtyard through the hammel range and a cart entry on the gable end. A later addition to the west side now forms parallel gabled wings. Only the two eastern ranges remain unconverted into dwellings.

Inside, the most significant features are found in the rear barn and the stable range, both of which retain early cast-iron roofs. These roofs consist of arched-braced trusses with diagonal struts and central vertical members that connect the two triangular sections of each truss. The rear barn is lofted, while the later barn has simpler timber trusses. The 'tower' features A-frame trusses and a roof with staggered purlins in the cross range.