Trewerry Mill

Trewerry Mill is a mill building dating back to 1690, constructed for the Arundell family, alongside a mill house rebuilt in the early 19th century. The mill is built of killas stone, with ashlar detailing, and has a delabole slate roof that replaced the original thatch covering. The mill occupies the higher northern end and has an artificial leat, or watercourse, running from the River Gannel along its north side. A one-bay link block connects the mill to the two-bay dwelling house, which has a lean-to addition to its east gable. Originally, the house had a living room and kitchen, with the kitchen subsequently moved into the lean-to. The building has 20th-century sheet glass windows.

The main entrance is through the link block, featuring a reset 4-centred stone doorcase with triangular spandrels that incorporate balls and a later inscription reading "APRIL 10TH 1820 FERREL". A timber battened door is present. Paned timber windows feature, with those on the upper floor gabled above the eaves. A gable entrance leads up six steps. Another doorcase has four-centred moulded decoration with leaf-cut spandrels and diabolo chamfer stops, inscribed with "1639 IA MA" (John Arundell). To the left, a three-light hollow-chamfered stone-mullioned window sits beneath a raised section of string course, accompanied by a smaller vent to the left. The roof is hipped. An overshot cast iron water wheel, originally 16 feet in diameter and inscribed with "Jabez Buckingham, North Hill", has been refixed to the exterior of the wall; its timber buckets have been replaced with blades.

Inside the mill, four bearing slots are visible within the former pit wall, now part of a living room. The house contains a stone fireplace with a 20th-century granite lintel in what was the original kitchen. The mill operated until about 1948 and was converted into a dwelling in the 1960s.