Former Engine House at Llwynypia Colliery Site

The former Engine House at the Llwynypia Colliery site was built in 1905 and is constructed of yellow and red brick in English bond, featuring stone and concrete details under a Welsh slate roof with a separately slated long pitched ventilator. The building has two storeys and a basement, measuring eight bays in length and four in width. The side elevations display four stepped eaves courses above round-arched first-floor windows, which have brick voussoirs and fixed iron frames for 24 panes, although no glass remains. These windows are separated by shallow pilaster buttresses with offsets of four courses of red moulded brick. The ground floor is offset with courses of moulded brick, and similar courses are present at the plinth. The ground floor has round-arched openings, all of which are now filled in. The west side has one blank bay to the northwest and a single-storey flat-roofed brick extension at the basement level.

The main gable end faces south and features an oculus in the gable, a date stone reading 'AD 1905,' and what appear to be stone kneelers and concrete coping. There are three round-headed iron-framed windows at the first-floor level and two at the ground floor, the latter designed for 40 panes on either side of a central doorway that is now blocked and has an arched ring to a recessed fanlight. There is also a small additional round-arched opening to the right and a deep plinth with two courses of moulded brick. The north elevation is similar, with metal glazing bars but no glass in the oculus; it has four round-arched windows at the first floor, three of which are partially or wholly blocked, and one with metal glazing bars. At the ground floor, there are four blocked windows and two blocked doors, with a nearly intact raised gablet of brick and concrete, which is only vestigial to the south. Attached to the building are the remains of a later steel and concrete addition.

The building is currently blocked up. An interior recording from 1989 noted a wide, steel-trussed roof, longitudinal metal girders on pilasters supporting a full-width, bow-trussed travelling crane with the embossed inscription 'J Booth and Bros. Ltd Engineers Rodney nr Leeds.' There are metal girder platforms around the ground floor. The building was reported as disused and in deteriorating condition at that time, and its condition has worsened since, with more openings now blocked.