15 Gelli-deg

15 Gelli-deg is a cottage forming part of a terraced row, largely altered over time. The row incorporates an 18th-century three-bay house with a small service range set back to the right, with six later cottages added in two blocks. Number 15 begins on the right with a single-room service range, possibly an earlier standalone house. This range is of painted rubble stone, with a slate roof and a rendered stack on the right end, which features dripstones, potentially indicating a previous thatched roof; it has late 20th-century plastic windows, including a large one over a smaller aligned window and another central ground-floor window. A windowless stone end wall completes the service range. The rear wall, also of painted rubble stone, continues from the main rear wall and has a door in the centre-right, along with a large plastic window under the eaves, and a further window on either side of the ground floor, the right-hand window being close to the probable party wall.

The main part of Number 15, and one bay of the current Number 16, appears to be a two-storey, three-bay farmhouse originally with end stacks, the left-hand one now removed. It is of painted stucco with raised surrounds to the openings, topped with a slate roof. The windows are largely late 20th-century plastic, with the exception of a two-pane sash window on the ground floor left (Number 16). A 20th-century door provides access. The rear wall is of painted rubble stone, featuring large boulders at its base. Three ground-floor windows with timber lintels are present, and upstairs, a single broad window sits under the eaves.

An interior inspection was not possible. In 1988, the service range had walls of river boulders; roof trusses were of oak with a single pegged purlin of roughly hewn wood, and a later added purlin, presumably when the roof was slated. A large fireplace occupied the right-end wall, incorporating an oven and timber spiral stairs to the right. The floor beams had been replaced. The original farmhouse, of which Number 15 is a part, had similar walls and oak double-purlin roofs with pegged collar trusses. A lobby entrance was located near the right gable, beside the large fireplace. A partition now separates Numbers 15 and 16, built of stone only on the ground floor and not tied into the upper structure. The stairs were positioned against the partition towards the rear, and oak floor beams were spaced at intervals of 1.2 metres.