Cnoc an Dudain, 7b Ruisgarry, Berneray

7b Ruisgarry is a single-storey, roughly rectangular-plan, rubble-built Hebridean-type cottage, likely dating from the late 18th or early 19th century. The roof is thatched and building has thick, battered rubble stone walls with slab-capped wallheads. The window openings are small and deeply recessed. It stands on the north side of Bays Loch on the east side of the Isle of Berneray, on the west edge of Loch Watersee.

The front (northwest) elevation is four bays wide, with an entrance to the left of centre. The rear (southeast) elevation has two window openings. There is one window in the northeast elevation.

The building has replacement side-sliding timber sash windows, and a timber ledge and braced front door. The piended roof was reinstated around 2010 and is thatched in marram grass with a continuous marram ridge. The roof is entirely netted and weighted along the eaves with stones, secured to the netting by wire. There is one stone chimneystack with a plain circular pot. Timber boards have also been used above some of the window and door openings to help keep the thatch in place.

The cottage interior was seen in 2017. The internal fabric and layout are all 21st century. The interior roof has exposed timber rafters and timber boards.