Heritage Category:
Listed Building
List Entry Number:
Date first listed:
Statutory Address:


© Crown Copyright and database right 2021. All rights reserved. Ordnance Survey Licence number 100024900.
© British Crown and SeaZone Solutions Limited 2021. All rights reserved. Licence number 102006.006.
Use of this data is subject to Terms and Conditions.

The above map is for quick reference purposes only and may not be to scale. For a copy of the full scale map, please see the attached PDF - 1204365.pdf

The PDF will be generated from our live systems and may take a few minutes to download depending on how busy our servers are. We apologise for this delay.

This copy shows the entry on 28-Oct-2021 at 07:10:59.


Statutory Address:

The building or site itself may lie within the boundary of more than one authority.

Medway (Unitary Authority)
Frindsbury Extra
National Grid Reference:
TQ 75856 70574



Fort. 1559-67 to designs by Sir Richard Lee, enlarged 1599-1601 to designs by Arthur Gregory and an Italian engineer surnamed Baptist. Converted into magazine 1668, Ordnance Laboratory 1827 and part of the Naval Armament Supply Department in the late C19. Coursed ragstone with some red brick heightening and patching. Rectangular main block with water bastion and river frontage belongs to Sir Richard Lee's design of 1559-67. Two riverside towers substantially rebuilt and gatehouse, curtain wall and moat added 1599-1601. River front height- ened, alterations to gatehouse and towers later in C17. Gatehouse: coursed coarse ragstone walls either side of entrance with cross-loops, one marked on lintel 'W. Webster XXIII Regt, 1787 May'. Coursed rubble gatehouse projecting from two wider taller rear towers, all brought up to greater height in C17 with double-splayed segment- headed stone-dressed gun-ports in top stage of sides of gatehouse. Wooden bell-cote over gatehouse with bell dated 1809. Recess immed- iately over gate-arch, perhaps for coat-of-arms. Round-arched inner gateway in line with inner tower walls with C20 balustrades on two floors over, following C18 configuration. Curtain wall: rebuilt after 1625. Coursed ragstone with red brick parapet and wooden stakes projecting over moat to north-west and south-west. Magazine: East side: Coursed ragstone with some red brick rebuilding. Main block in centre with north and south towers attached by lower walls at level of band on main block. Staked palisade projecting to east into River Medway in triangle full-width of block with inner gun-embrasured water bastion full width of magazine only. North-east and south-east towers: Rectangular with brick parapets and round stair-towers towards Medway. Various irregular loops and wooden mullioned windows. Magazine block: Platband at half-height and crenellated parapet. End projecting round towers and central projecting octagonal stair tower, all taller than block which has recessed ends behind shallow splayed side to centre. 4 oculi on two upper floors and 2 round-arched windows on stair-tower, all added before 1698. Various other loops. 3 round-arched doorways at water bastion level, one in centre to wooden spiral stair, two outer doorways to small side compartments under magazine. At the height of its use in the early C17 the Castle was equipped with 'a demi-cannon, 7 culverin, 5 demi-culverin, a minion, a falcon, a saker and 4 fowlers with 2 chambers apiece'. See A. Saunders, Upnor Castle, DOE Official Handbook, 1983. Upnor Castle is a scheduled Ancient Monument and is in the care of the Historic Buildings and Monuments Commission.

Listing NGR: TQ7585470566


The contents of this record have been generated from a legacy data system.

Legacy System number:
Legacy System:


Books and journals
Saunders, A , Upnor Castle, (1983)


This building is listed under the Planning (Listed Buildings and Conservation Areas) Act 1990 as amended for its special architectural or historic interest.

End of official listing

Images of England

Images of England was a photographic record of every listed building in England, created as a snap shot of listed buildings at the turn of the millennium. These photographs of the exterior of listed buildings were taken by volunteers between 1999 and 2008. The project was supported by the Heritage Lottery Fund.

Date: 14 Aug 1999
Reference: IOE01/00773/12
Rights: Copyright IoE Mr M.K Lofthouse. Source Historic England Archive
Archive image, may not represent current condition of site.
To view this image please use Firefox, Chrome, Safari, or Edge.

Your Contributions

Do you know more about this entry?

The following information has been contributed by users volunteering for our Enriching The List project. For small corrections to the List Entry please see our Minor Amendments procedure.

The information and images below are the opinion of the contributor, are not part of the official entry and do not represent the official position of Historic England. We have not checked that the contributions below are factually accurate. Please see our terms and conditions. If you wish to report an issue with a contribution or have a question please email [email protected].