Owain Glynd?r’s Parliament House was traditionally the building where Owain Glynd?r held a parliament after being crowned Prince of Wales in 1404. The origins of this structure are probably later. The existing building may be 15th century in origin, but has been extensively rebuilt particularly by David Davies of Llandinam who purchased it in 1906. It was opened on 20 February 1912 to provide a social centre for the town. The present rubble exterior is an interpretation of its C15 appearance probably by the architect Frank Shayler, who may also have designed the adjacent Glynd?r Institute.
In the centre of the town. Set into a continuous row of frontages midway along Heol Maengwyn, opposite the entrance to Plas Machynlleth and to the left of the Owain Glyndwr Institute.
In about 1813 the artist Edward Pugh visited Machynlleth and in 1816 he published a fine coloured lithograph of Parliament House. He provides the following description of the building Owen Glyndwr held his parliament here: and the house is still in being in which he and his adherents assembled. Its exterior appearance is barn like, and it is now used as a granary, etc, with the exception of one end, which is occupied as a miserable dwelling-house. Its interior exhibits great age: at the back is a flight of stone stairs in ruins, leading into the great room, in which there are carved ribs etc, in timber