Ardsley Mill and attached engine house and chimney

Ardsley Mill, along with its attached engine house and chimney, is a steam-powered worsted spinning mill built between 1912 and 1913, with minor alterations made in the late 20th century. It was constructed for Thomas Ambler & Sons by the Yorkshire Hennebique Construction Company Limited. The mill is made of reinforced concrete with brick infill and features a flat cement and bitumen roof. It has two storeys over a basement, measuring three bays by seventeen bays, with a four-storey tower at the center of the northwest side. Each bay contains three windows separated by brick piers, and there is a curved and wavy concrete parapet.

The main façade facing southwest has nine three-light casement windows, while the upper two floors feature nine nine-light windows. The lower brick panels display the lettering: "THOMAS AMBLER INTERNATIONAL FINE WORSTED SPINNERS." The southeast front has taking-in doors on all three floors. The engine house, boiler house, and economizer are attached and clad in brick, featuring similar curved parapets and a truncated circular brick stack. The northwest façade consists of seventeen bays, with the central two bays obscured by the four-storey tower that houses the rope race.

Inside, the mill has open floor areas with brick walls defining the central rope race. Two rows of concrete piers support cross beams and concrete floors. This mill is a fine example of a textile mill built using the latest reinforced concrete system and is recognized as the best preserved and earliest example of its type to survive in Yorkshire.