Devon colliery pumping engine house

The building is the beam engine pumping house of the former Devon Colliery, constructed in 1864 by Neilson & Company of Glasgow. It is made of ashlar red sandstone and features a hipped grey slate roof, with a rectangular plan. The cast iron pumping beam and cast iron girders of the pumping engine machinery are still in place, with the beam extending through a large arched opening in the south wall. The beam is marked with an inscription that reads "No.189 / Neilson & Co. / Glasgow / 1864". There are additional arched openings in the north, west, and east walls that contain various arched metal framed multi-pane windows, as well as an arched doorway in the east wall for access. Inside, a framework of cast iron beams supports the pumping beam, and a narrow turnpike stair in the northeast corner leads to the upper areas. Two mezzanine floors have been added to create office space during the building's conversion.

The Devon Colliery beam engine house was initially built in 1864, with the pumps fully installed and operational by 1879, when the colliery reopened. The pump engine served as the main method for water extraction until 1932, when electric pumps and a steam turbine pump were introduced. The beam engine continued to be used occasionally to assist the new pumps until the 1950s.