Paper Mill, Chirnsidebridge

The paper mill, located at Chirnsidebridge, was designed by David Cousin and built in 1842. It was subsequently extended in 1852 and 1897, with later alterations, some demolition, and additional structures. The main range runs east-west and is situated on a sloping site, with a tall brick chimney to the north. The building is constructed of squared and snecked sandstone with droved ashlar dressings, while the side and rear elevations are of painted rubble and brick.

The west elevation has a varied arrangement of bays, grouped as 9-3-13-3, with windows to each storey in every bay. The central 2-bay group features a broadly-spaced gable with kneelers, an ashlar finial, and a clock in the gablehead. The 3-bay group to the right has a shallow gable with an ashlar finial. A modern panelled and partially-glazed door is located on the ground floor of the right-hand bay of this group. The 13-bay group is symmetrical and three stories high, with a slightly advanced central 3-bay section featuring a skew gable with kneelers and an ashlar finial. A plaque is set into the gablehead, inscribed with the name "Y Trotter and Son (limited) paper makers" and dates indicating construction in 1842 and extensions in 1852 and 1897, along with a round emblem above. The northern elevation has been significantly altered with the demolition of several single-storey buildings and the addition of a modern unit.

The windows are a mix of types, primarily 12-pane timber sash and case, fixed pane, and 3-pane upper hopper windows. Each section of the building has a slate roof, with strip rooflights over the 9-bay and 13-bay groups, and conical vents are set into the ridge. Internally, the 13-bay group has iron girders and supporting columns on the ground floor, while the roof of the 9-bay group features timber king post trussing. The clock mechanism is by J Gibson, Maker, Berwick, and remains in place. A circular-section brick stalk rises to a height of approximately 120 feet.