Plas Coch

Plas Coch is a manor house dating back to 1569, with later additions from around 1820 and the late 19th century. The original core consists of the front central block containing the main entrance, hall, and former library to the south, along with the rear kitchen wing. Subsequent additions to the north and west have created an approximately rectangular overall plan.

The east front is symmetrically designed, extending over two storeys with a garret and basement, and comprises five bays with advanced outer and central gables, all featuring crow-stepped gables and carved finials. The house is constructed of squared red sandstone with gritstone dressings, and has a slate roof. The central gable forms a storeyed porch, which features a four-centred door head set in a square frame with moulded jambs and a label. Within the spandrels of the door head are shields of arms, representing Llywarch ap Bran for Hughes and Collwyn ap Tangno for Owen of Llanfaethlu. An inscription above the doorway reads "IN THE YERE OF LORD GOD 1569 D H MAD THYS HOU”. A 19th-century achievement is positioned above the doorway within a small recess, flanked by late 16th-century columns and a pediment. A pedimented oriel window from the late 16th century is supported by 19th-century brackets, with a mullioned garret window above. The outer gables have three-light mullioned and transomed windows, pedimented on the ground and first floors. Between the gables, the outer windows are four-light, with narrower two-light windows abutting the porch gable. Paired, stepped gabled dormers are present in the roof.

The south elevation mirrors the design of the east front with a stepped gable similar to the gables on the east front. The windows are 19th-century insertions. The west part of the house was added around 1820, replicating the late 16th-century detailing. The north elevation features a late 16th-century window on the first floor, similar to those on the east front, and an original dormer window with 19th-century dressings above. The west gable is stepped, and the chimney stack has a double hollow chamfered coping, likely dating back to the 19th century. Moulded eaves coping and corbels run around this block.

A late 16th-century tower is situated at the angle between the hall and kitchen. This tower has an ogee roof and retains some original windows, copings and corbels.

The original symmetrical plan incorporates a porch with an original internal doorway, leading to the main hall with flanking wings—the former library and hall are now combined into one room. The hall holds a 19th-century imperial staircase on the right side and a lateral fireplace at the rear. The northern part of the house dates to the late 19th century. Directly behind the hall is a kitchen, though it lacks direct access. A bedroom above the kitchen is said by RCAHM to contain a powder closet built into the wall's thickness, likely a modification from the 18th century.