Rhuallt Hall is a prominent farmhouse of the 18th century, extended to the right (east) and much altered at the rear. It is a building of three windows and three storeys, in local slatey stone with a slate roof and small brick end-chimneys. It has graded-height window and door openings with cambered voussoir arches in limestone and painted stone sills. There is a large lateral-chimney at rear. The rear is altered and has a large flat-roofed extension, with a roof terrace.

The main elevation has central entrance with 6-panelled door with an overlight in three panes. There is a single window 2-storey extension to the right, in red brickwork the front elevation of which is rendered.

Reference: Cadw listed buildings database.
RCAHMW, 2009.