The following text is from the original listed building designation:
TQ 76 NE CHATHAM MAIN GATE ROAD
(East side) Chatham Dockyard
762-1/8/67
The Customs House
GV II*
Guard house, now office. Early C19. Brick with slate hipped roof. Single-depth plan. Single-storey; 3-bay range to each side. Chamfered surrounds with rubbed brick flat arches to central doorway and recessed door, and 6/6-pane sashes. INTERIOR: not inspected.
HISTORY: attached to the wall to rear of former Commissioner's House (qv), and a pair with the matching guard house (qv) opposite. Occupies a very prominent position close to the ropery complex, and graded for its historical importance as an item within this notably complete Georgian dockyard and factory.
Listing NGR: TQ7586969021 (1)

Description from record TQ 76 NE 127 :
(TQ 7587 6902) SAM No. 388 [Customs House: scheduled]. (2)

<1> English Heritage, List of Buildings of Special Architectural or Historic Interest (Map). SKE16160.

<2> English Heritage 1:1250 SAM location maplet (OS Card Reference). SKE41612.