Garthgynan

Garthgynan is a large farmhouse dating from the 17th century. The front elevation is made of brick, while the rear and side elevations are a mix of local coursed limestone and brickwork. The house features slate roofs with coped main gables. The original brickwork is in English Garden Wall bond. It is a double-pile structure, mostly 2½ storeys high, with part of it rising to 3 storeys. There is a rear gabled bay that slightly projects and has bargeboards. The front pile includes end chimneys, while the rear pile has an end chimney on the west side and a substantial lateral chimney facing the garden. All chimneys rise well above the roof before splitting into star or ribbed diagonal stacks. A small rooflight is located at the rear, and tie anchor plates are present on the rear gable.

The front elevation is nearly symmetrical, consisting of three bays. The right window position has been adjusted to avoid the kitchen chimney. The outer windows are 12- or 6-pane sash windows with timber mullions and side sashes, while the central window features 16- or 8-pane sashes. All sashes are hornless, and the frames are concealed. The rear elevation has three 16-pane hornless sash windows with exposed frames.

To the right (west) is a single-storey monopitch annex with a rear porch, constructed of brick and covered with a slate roof. A rubble limestone wall with irregular coping defines the boundary of the house site with the farmyard.

The house has a three-unit plan in both the front and rear piles, featuring a central staircase from the 17th century with solid newels and bulbous turned balusters, while the upper flight is of lighter construction. There is also a narrow and steep servants' staircase. The right unit at the front serves as the kitchen, which includes a large fireplace with a cambered bressummer and an oven to its right. The kitchen ceiling has two exposed main beams, with the beam closer to the fireplace showing unused mortice holes, suggesting it may have been relocated. Additionally, there is a large cellar with stepped tongued chamfers on the floor beams above.

The attics open to the roof, with rafters pegged into mortices in the purlins. An original principal rafter can be seen at the right of centre at the front of the house, indicating that the front has been heightened.