Bryn Gwyn dates back to 1756 was built for the 'Captain' or 'Master' of the mine. It has a grade II listing and is described by CADW as being the best preserved of a small group of buildings that includes an engine house and blacksmiths/joiner's workshop associated with the Llyn-y-Pandû and/or Pen-y-Fron mines. The traditional lime washed render over stone rubble, slate roof and a central door that is flanked by 16 pane sash windows are characteristic features of a house of that time. An extension was added to the rear in the early 19th century and there are two brick vaulted cold stores and other stone out buildings within the grounds.