23-24 The Square, Penicuik

23-24 The Square in Penicuik is an early 19th-century, three-storey, three-bay near-symmetrical townhouse featuring a pilastraded shopfront on the ground floor. The building is constructed of tooled sandstone ashlar, which is painted at the ground level, with polished dressings and raised margins. It has a base course, a corniced lintel at the ground floor, and cill courses at the first and second floors, along with an eaves course.

On the southwest (principal) elevation, there is a seven-bay pilastrade at the ground level, with a five-bay shopfront to the left. This shopfront includes a modern door at the center, flanked by pairs of two-pane plate glass windows in the adjacent bays, and a blank bay to the penultimate right. There is a pend entrance in the outer right bay, featuring a modern decorative wrought-iron gate. The first and second floors have regular fenestration across the bays.

The northwest elevation is adjacent to another building. The northeast (rear) elevation has a bowed stair tower engaged to the left of center, with a window positioned between the first and second floors. The southeast elevation is also adjoining another building.

The interiors were not seen in 1999. The building predominantly features 12-pane timber sash and case windows. It has a grey slate roof with a lead ridge, cast-iron rainwater goods, and rendered and lined gablehead stacks that are splayed to the left, coped with circular cans. The coped skews are complemented by decorative skewputts with panelled obelisks on the principal elevation.