Barn at Great Campston

The barn at Great Campston is a large structure built from thinly coursed local sandstone and topped with a slate roof. It features a timber cupola with a leaded ogee curved roof over the threshing floor, along with three domed louvred vents with felted roofs above the right-hand storage bays, which may have replaced earlier lead roofs. The barn has an asymmetrical layout, with the threshing bay positioned to the left of center. This bay includes a narrow gabled porch on the upper side facing the house, which appears to have been added to the original barn structure.

There is a high doorway beneath the gable, which has dove holes in its boarded apex. The front wall has a series of small triangular vents in the left-hand bays and slit vents in the right. The far right-hand bay features narrow opposed doorways, with the front doorway having voussoirs. A section of limewash on the front wall may indicate a lost extension. The right-hand return has a pitching door with an arched head and voussoirs, along with an inserted wide opening below.

The rear elevation shows scars from cross ranges on either side of the threshing bay and displays clear evidence of triangular vents in two tiers in the bays flanking the threshing bay, suggesting that the primary barn dates from before the 19th century. The end bay, which may be an addition, has slit vents. The threshing bay, which has a reinstated flagstone floor, is flanked by two bays on the left and three on the right, defined by 19th-century haunched king post and strut trusses.