In each of the middle two bays of the north side stands a round-arched doorway with a sculpted angel's head on the keystone. Above the westernmost of these two sits a late-Gothic niche bracket bearing the arms of Edinburgh. These north doors are enclosed by a large, pedimented Palladian porch in channelled masonry of three bays and two storeys. The ground level is entered by round-headed arches while three rectangular windows illuminate the upper storey. Internally, the upper storey of this porch contains two vestries accessed by a wooden turnpike stair.