North Tower House and Attached Perimeter Wall to the South

North Tower House is a house built around 1718, with alterations made in the late 19th century. It is constructed of English bond brick and features late 19th-century brick lateral stacks and a slate pyramidal hipped roof. The house has a single-depth plan and stands three stories tall with a two-window range.

The street front displays battered buttresses and a row of shallow rectangular recesses at the ground floor, along with a plat band and a Lombard frieze on the second floor. There is a late 19th-century segmental-arched doorway on the right side, which has a half-glazed door with margin panes, and a low left-hand oculus. The first floor features two oculi, while the north front has been altered with late 19th-century tripartite sashes on the first floor and paired 6/1-pane sashes on the second floor. The west side includes a wide round-arched gateway at the ground floor with a glazed opening. There is also a single-storey late 19th-century yellow brick extension attached to the north, which has a 6/1-pane sash.

The interior has not been inspected. An attached brick perimeter wall extends from the southeast corner downhill for approximately 500 meters to the south, leading to the South Gate House. This wall has raised surrounds at the entrances to the gardens of the Officer's Terrace. Additionally, there is another length of coped brick wall attached to the southwest corner, extending about 20 meters to the south.

Historically, this structure is part of the eastern perimeter wall that includes the South Tower House and Gatehouse, built during the early 18th-century expansion of the Dockyard. The wall originally enclosed the yard and featured towers at the corners, each with pairs of oculi on the external faces and a crenellated parapet. The remaining sections of the wall highlight the need for protection of the Yard prior to the mid-18th-century construction of the Chatham Lines, marking the extent of the early 18th-century dockyard, which was one of the largest factory sites of its time in the world.