Mill Number Three With Turbine House, New Lanark

1826-33. 6-storey, 15-bay, rectangular-plan, astylar classical, piend-roofed block with 5-storey, 3-bay link to former Mill No 4 with separate piended roof (see Notes). Symmetrical main block with advanced central gable-pedimented 3 bays, oval oculus and chimney at apex; advanced single outer bays. 3-bay link to outer left with central doorway. Sandstone rubble with droved and stugged ashlar dressings. Band course to pediment; eaves course and blocking course to advanced outer bays. Long and short quoins. Regular fenestration with tabbed ashlar margins; small dormers to front and rear of main block. Large opening to left at first floor level; covered late 20th century ramp above from Institute to 1st bay of 3rd floor

16-pane and 12-pane glazing in timber sash and case windows. Coped stack. Grey slates.

INTERIOR: some surviving 19th century details. Fireproof construction of brick arches between cast-iron beams carried on cast-iron columns. Basement floor with black and red floors tiles. Unique cast- and wrought-iron roof frame at E end in link section. Attic floored with cast-iron plates. 1920s turbine in basement.