Llys Meddyg, including forecourt railings and gate

Llys Meddyg is a pair of late-Georgian town houses located at 23-25 Castle Street. They are two storeys tall and have three bays, featuring pebble-dashed walls painted cream, a slate roof, and roughcast end and central stacks. Each house has a central entrance; No 25 has a fielded-panel door, while No 23 has replacement double-panel doors. Both entrances include a 5-pane overlight and a restored segmental canopy supported by moulded wooden brackets, with details in No 25 reinstated to match No 23. The windows are renewed 16-pane hornless sashes with cambered heads.

In front of each house, there is a dwarf coped stone wall and restored wrought iron railings that feature twisted spear and cast-iron urn finials. Each house also has a gate designed in a similar style.

The rear of the houses is constructed of rubble stone and features cambered 16-pane hornless sash windows on the right side and upper left. In the centre, there is a 4-pane sash window and a small-pane window to its left, which was formerly a doorway, providing light to the stair area. Below this is an added one-storey projection.

The houses have a double-depth plan organized around a central hall, with a dog-leg stair at the back that has a turned newel and plain balusters. The upper storey retains panel doors, and wooden stairs lead down to the basement.