The following text is from the original listed building designation:
HADLOW HIGH STREET (south side) TQ 63 49 7/82 Gateway to Hadlow Castle 20.10.54
GV II*
Ornamental gateway to Hadlow Castle (q.v.). Circa 1820, probably by George Ledwell Taylor who designed Hadlow Castle (q.v.). Cement-rendered brick. Gateway is set back from the street facing north west and is built between the contemporary North Lodge (q.v.) and South Lodge (q.v.). It is an impressive triple arch with large central carriageway flanked by pedestrian gateways. It is built in the same distinctive Gothick style as Hadlow Castle (q.v.).
All 3 arches are 2-centred with moulded arches, clustered shafts and moulded capitals and each is surmounted by a tier of narrow lancets, moulded cornice and crenellated parapet. The central arch is wider and taller, and is flanked by buttresses with weathered offsets. Piers each end have taller panelled buttresses and rise with steeply-pitched finials the tops of which have broken off.
Listing NGR: TQ6335149741 (4)

Description from record TQ 63 NW 15 :
(TQ 6334 4974 sited from OS 1/2500, 1972) Ornamental gateway to hadlow Castle (TQ 64 NW 14). Built c.1820, it stands between the North Lodge (TQ 64 NW 29) and the South Lodge (TQ 64 NW 27). It is an impressive triple arch built to the same Gothick style as the castle. (1)

Description from record TQ 64 NW 28 :
[TQ 63354974] (1) HADLOW HIGH STREET (south side) Gateway to Hadlow Castle. Ornamental gateway to Hadlow Castle (qv). Circa 1820, probably by George Ledwell Taylor who designed Hadlow Castle (qv). [Full architectural description] LISTED GRADE II*. (2-3)

<1> DOE (HHR) District of Tonbridge & Malling 1990, 866 (OS Card Reference). SKE40515.

<2> DOE(HHR)Dist of Tonbridge and Malling Kent, 19th Feb 1990 66 (OS Card Reference). SKE41374.

<3> OS 1:2500 1972 (OS Card Reference). SKE48214.

<4> English Heritage, List of Buildings of Special Architectural or Historic Interest (Map). SKE16160.