The Gate House

The Gate House is an impressive structure featuring two main storeys above a tunnel archway, situated where the road is cut into the cliff. It has stucco elevations and a hipped slate roof, which is feathered at the eaves, along with a flush lateral chimney on the northwest side. The southeast side, which faces downhill, has flush buttressing that creates a pronounced battering effect on the principal northeast and southwest sides.

On the northeast elevation, there are small casement windows arranged in a scattered pattern, along with circular, shaped, and rectangular lights. Above a rusticated arch, there is a large polychromed cartouche displaying the Prince of Wales' crest, accompanied by the Garter motto and the Prince of Wales' feathers. Above this, a circular plaque features the Welsh dragon, and directly above it is the chimney. Flanking the chimney under the eaves are small casements with faux shutters that are incised and painted into the surrounding walls.

The southwest elevation is similarly asymmetrical, featuring a projecting balcony with a Regency-style canopy over the rusticated arch and a small-pane glazed door. The upper floors have twelve-pane sash windows, and there is a second, recessed balcony off-centre under the eaves, which has a pierced block-work balustrade and flanking caryatids. The tunnel's downhill end has an open oculus, with a simple iron-railed balcony above it that includes a glazed door and a twelve-pane sash window on the upper floor.

Inside the tunnel, the ceiling is adorned with a baroque-style mural.