Built as the stable block to Trevalyn House (dated 1754) (NPRN 27959) with which it is probably contemporary though an early Victorian date has been argued for.
A two storey range of red-brick with stone dressings, under a pitched slate roof. In plan it comprises an open courtyard with walled and (later) gated entrance to the west.
The south block was the coach and stable accommodation, having large stone dressed arched openings with a single keystone to the first storey and alternating small thermal windows with three keystones to the second storey. The storeys are delineated by a wide stone string course.
The central block, to the east, is of three bays with the central bay projecting into the cobbled courtyard and surmounted by an open triangular pediment. In the opening of the pediment is a circular window probably to have received a clock. There is a later weather vane to the top of the pediment.
The north block is unfenestrated at second floor level and to the rear gives onto a further stable yard and the west wall of the former kitchen garden.
Internally it is largely unaltered and retains the nesting holes of a former dovecote to the rear of the central entrance.
(Source; Cadw listing database) S Fielding RCAHMW 19/10/2005
