The following text is from the original listed building designation:
LONDON ROAD 1. 1614 (West Side) Nos 21 to 25 (odd) TQ 5254/1/69 II 2. C18 stucco elevation masking older framed structure. 2 storeys. Parapet with moulded stucco coping. Broken ridge tile roof, raised in centre and half hipped to right. Modern shop fronts on ground floor. 3 widely spaced C18 sliding casements in moulded frames and with glazing bars. 1 small tiled dormer in centre. Side elevation with exposed vertical half timbering with plaster infilling on ground floor and tile- hanging above.
Listing NGR: TQ5297454674

Description from record TQ 55 SW 30 :
House, probably C16 originally, with rebuilding of the C17 and C19

Dendrochronology dating of the rear wing gave a date range of 1588-1617. (2-3)

Historic England archive material: BF083015 21-25 LONDON ROAD, SEVENOAKS Miniature Format Film Number: 94/W RCH01/048/01/571 Labelled sheet of drawings of twenty-one to twenty-five London Road, Sevenoaks, with a plan of the first-floor showing joists, a cross-section, a dais beam profile, and a scarf joint detail

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

<2> Vernacular Architecture Group, ADS Dendrochronology Database, Vol. 39, Pg. 107 (Website). SKE17391.

<3> Vernacular Architecture Group, ADS Dendrochronology Database, Vol. 19, Pg. 49 (Website). SKE17391.