Corllan is a small lofted cottage, dated 1726 by a stone carved plague set into its northern gable at high level. This single storey double room cottage is built from rubble stone which was rendered with whitewashed roughcast in the mid twentieth century, with decorative raised banding around the windows, plinths and at corner quoining, all painted black.The joinery is white painted timber four-pane sash windows to the east front and a small square fire-window to the right. There are stucco window surrounds and slate sills.
The roof which was originally corrugated iron over thatch has been slated recently in plain, smooth , blue black fibre reinforced cement slates with two small roof windows. The southern gable has a small brick flue while the northern gable has an earlier short and wide stack serving the main inglenook fire below. There is a twentieth century addition to the right.

Source:- Cadw listed buildings and Design & Access statement, LBC application, NJR 16/07/2008