Plas Mynach

Plas Mynach is a Grade II* listed building constructed from local stone featuring snecked rubble facings, dressed quoins, and limestone dressings. The slate roofs have distinctive unkneelered crow-step gables, oversailing eaves, and grouped masonry chimneys. The structure includes a mock-defensive low spreading tower with a stair turret, a main range to the south, and low service ranges to the north. Adjoining the tower to the east is a twin-gabled gatehouse range. The building has two storeys, with the tower rising to three storeys plus a raised basement, and single-storey service buildings.

The main block features a dentilated string course and twin outer gables on the south face, which have curved angles at the ground floor. The windows are 2, 3, and 4-light mullioned and transomed types, with small-pane glazing, chamfered surrounds, and cills. An advanced gabled entrance porch has a moulded four-centered arch with incised foliage decoration, rolled angles, and a recessed boarded door with decorative ironwork, accessed by slate steps. Above the porch is a heraldic panel with the initials 'WHGA'. There is a splayed bay at the ground floor of the south end with an incised sundial dated 1890. The long sea-front features a similar design with a small stepped parapet wall at the porch's angle and a central 5-light window with a transom.

The property includes walled terraces with cappings and an archway, with slate steps leading down to the garden. The tower has battered walls and a corbelled parapet with raised angles, along with a clasping stair turret topped by an elaborate ironwork weathervane. The gatehouse range features an advanced gable to the left with a dentilated string course and a wide Gothic archway leading to a curving terrace at the main entry. Some windows have cusped lights, and there is an oriel over the inner archway, along with a bellcote on the roof. The curving terrace has slate copings and massive raked buttresses, while a square rubble gazebo with a pyramidal roof is located at the southwest of the terraced gardens.

The interior was not accessible during the inspection in October 1994, but it is said to retain its original character.