Glan Seiont comprises a single storey central section which dates to the late 17th century. This has a low door with a small window opening to the west and a smaller window opening to the east. There is an addition to the east dating the early 18th century and a later section to the west. The house is named on the first edition OS 25" map, CA XI. 14, of 1889.
Source: Caernarvonshire Inventory, Vol II, No1299