St Clement's Watch House

St Clement's Watch House is a three-storey building from the 18th century, constructed of stuccoed brick with stone copings and timber framing for the covered way. The building has an L-shaped plan, with one main room on each floor. The western section spans above ground-floor level over Strand Lane and is adjacent to the former boundary wall of Somerset House.

The exterior features a mansard roof set behind a parapet. The south elevation of the western range is two bays wide, with a casement window on the ground floor and the covered way occupying the western bay. On the first floor, there are two French casements with margin glazing, which are sheltered by a Regency tent-roof cast-iron verandah-balcony adorned with anthemion pattern standards and rails. The second floor has two recessed sash windows with glazing bars. The north elevation consists of a single bay with French casements on the first and second floors. The covered way over Strand Lane is supported by large timbers with chamfered edges and features two doorways in the eastern wall. The northern doorway has a pilastered timber door surround with diamond patterned capitals and a rectangular fanlight, while the southern doorway is set in a plain recessed opening with a segmental arch. A chimney, supported on corbels, is visible below the covered way and is adjacent to the former boundary wall.

The eastern elevation of the east range, which faces Strand Lane north of the covered way, has two bays. The ground floor includes a plain recessed entrance with a transom in the north bay and a recessed timber sash window with glazing bars in the south bay. The upper floors have centrally placed single windows with horizontal sliding sashes, and the mansard roof features a central dormer.

The interior has been modernised, and no historic features are visible. The layout is likely as originally built, although access has been created to connect the interior with adjoining parts of the King’s College campus.