Milgatw farmhouse is situated on the northern outskirts of Tredegar, just to the east of Shon Sheffrey's Reservoir. It is a Grade II* listed building, because 'a very rare survival in the industrialised Monmouthshire Valleys of a substantial C16-C17 upland farmhouse, with much of its character intact. Of the relatively few early vernacular farmhouses in the area, few have survived in such instructively unaltered form.'
The house was built in the sixteenth and seventeenth century, although it is said to have medieval origins. According to CADW, the sixteenth century house 'seems to have consisted of a chimney-entry plan, with hall and perhaps a small parlour.' The house was substantially enlarged in the seventeenth century - an upper floor was added, the parlour end was lengthened 'to form an unusually large parlour with its own chimney stair.' More additions occurred in later centuries, including 'the long downslope byre, possible of the 18th century,' which formes 'a cross-passage.' This was 'superseded in the nineteenth century, when, typically, the house was given a centralised doorway. The house and parallel outbuilding shown on 1846 Tithe Map.'
Milgatw was constructed of rubble, 'with areas of drystone masonry and traces of limewash.' The 'house faces east, set behind small walled garden, with a cowhouse to the south having pitched stone yard in front.' The house's roof is of corrugated iron, 'with some that intact underneath.' There is a 'large square rubble built chimneys to each end of house: larger to the south, both set on plinths, with dripmoulds. The smaller rubble chimney is towards the upper end of the cowhouse. It serves a bread oven, which was inserted in the later nineteenth century. The front of house is of four bays, separated by straight masonry joint from cowhouse. There is a panelled door towards centre with a timber lintel, and 3-over-6 sash window to left with stone lintel. Above this, set between the latter and the door is window with two-light casement, including a diamond mullion (probably not 17th century). The upper two bays are clearly later, demarcated by masonry joint. There are two ground floor windows, and afirst floor window overhead: timber lintels and derelict glazing. Front elevation of lofted cowhouse is of five bays with a window to left, replacing an earlier door. There are two doors to the right, with cross-passage door to right end. Most doors have been renewed. The ground level has been raised to the rear of house. There are two blocked windows to left with projecting stone drips and small-paned window to right with timber lintel. To the right, the wall projects for chimney stair in hall. The area of wall around cross passage door has collapsed.'
Inside the house, there are slate flags on the ground floor, and large chamfered beams above. The hall 'has chimney stair to right of wide fireplace which has a nineteenth century iron range and timber mantel.' The 'cross-passage door to left of fireplace has a four-centred chamfered timber frame, visible from the cowhouse. The Roof has rough oak A-frames which were not fully inspected and the condition of the house was deteriorating at the time of survey (June 1999).'

Source: CADW database of listed buildings, reference number: 22494
M. Ryder, RCAHMW, 20th December 2018.