The following text is from the original listed building designation:
TR 35 SE DEAL DOVER ROAD, Lower Walmer
(North West side)
860/5/10011 Building 129 (Guard House),
South Barracks
GV II
Guard house and lock up. 1861, with Detention Block added late C19. Yellow stock brick with brick ridge stacks and slate hipped roof. L-shaped single-depth plan. Single storey; 4x7-bay verandah to guard house, 5-window late C19 cell block. EXTERIOR: The S guard house, painted white, has an overhanging roof forming a verandah on cast-iron columns, with 2 doorways to the centre of the long side with small lights each side, and a 6/6-pane sash in the end. The detention block has small segmental-arched lights with iron frames high beneath the eaves of the cells. INTERIOR not inspected, but reported to contain original room divisions. HISTORY: One of only two examples of guard houses in barracks built by the Barracks Department at the start of the Revolutionary War with France. Forms part of a group with the Officers' mess and infantry and cavalry barracks (qqv) in one of the most complete late C18 barracks in the country.
Listing NGR: TR3755351133 (1)

Description from record TR 35 SE 145:
Single-storey, brick building dating from 1831 to 1872, originally used as a guardroom. Part of South Barracks, Building No.129.

Additional references (2-4)

Historic England archive material: BF090876 ROYAL MARINES SCHOOL OF MUSIC, WALMER, DEAL Miniature Format Film Number: 197/P,197/T,197/U,198/N,198/P,198/Q,198/S

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

<2> Canterbury Archaeological Trust, 1997, Deal Barracks Redevelopment: Arch Evaluation Design (Unpublished document). SKE7248.

<3> Canterbury Archaeological Trust, 1997, The Royal Marine Barracks Site, Deal, Kent: An Archaeological Implications Survey (Unpublished document). SKE7245.

<4> Biddle and Biddle, 1998, The Royal Marines Barracks, Deal,Kent: South Barracks (Unpublished document). SKE7251.