The following text is from the original listed building designation:
BOXLEY ROAD 1. 5278 (South-East Side) The Rotunda at Maidstone Prison TQ 7656 SW 5/179C 26.7.73. II GV 2. Built between 1809 and 1811 by Daniel Alexander. This is the only remaining Turnkey's House, of 4. Originally the building was attached to buildings on all 4 sides for reasons of security. It is now all one floor with basement but appears originally to have been 3 storeys and basement. Built of Kentish ragstone. Slate roof with wide moulded eaves cornice. Stringcourse from 1st floor to ground floor. Circular in shape but the 2 lover floors splay out on all 4 aides and were originally attached to other buildings. The 2nd floor windows are blank sashes. The 1st floot has 2 round-headed windows on each elevation. The ground floor has fixed windows set in segmental openings with cast iron columns. Attached to Theatre block on ground floor. Domed interior.
All the listed buildings at Maidstone Prison form a group.
Listing NGR: TQ7612656279

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