9 & 10 December 2025: Wednesday 10 December 2025 - 9:00am
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    Key features

    • To be offered on Tuesday 9 December
    • A freehold nineteenth-century military sea fort
    • 4 sunken barges and part of the estuary included (please refer to the title)
    • Built between 1870 and 1872, following the recommendations of the 1859 Royal Commission on the Defence of the United Kingdom
    • Decommissioned for use before WW1 but later used as an observation post in WW2
    • Development/alternative uses, subject to consent
    • Same ownership for 40 years
    • Located on the River Medway
    • Vacant

    Description

    A freehold nineteenth-century military sea fort, listed as a scheduled monument that was constructed between 1870-1872 for Naval Sea Defence.

    Fort Darnet is one of two forts constructed on low islands on opposite sides of the Medway channel. Hoo Island is located just 1Km upstream. They were designed to create a "bottle neck" defence for the river. 

    The pair of forts were built on the recommendation of the Royal Commission on Defence, and were intended to provide an inner line of defence to protect the approaches to the naval dockyard at Chatham.

    Fort Darnet was originally designed for two tiers of guns mounted in a circle, with a boom strung between them. However, extensive build costs, meant that the boom was never implemented. 

    The fort was built to hold a garrison of 100 men and used for gunnery practice. It was decommissioned for use prior to WW1 but was utilised as an observation post in WW2 with platforms and pillboxes built on top.

    The fort is still in fair condition, however the magazine level is flooded. The island is only accessible by boat and was used for picnicking and leisure up until the 1980's.

    It is scheduled under the Ancient Monuments and Archaeological Areas Act 1979.

    Additional information

    Tenure

    Freehold

    Accommodation

    A freehold military sea fort and land (Please refer to the title).

    Tenancy

    Vacant.

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      Local information

      Located on the River Medway in Kent near Gillingham.

      Transport

      Access by private boat only.

      Legal documents

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      EPC rating

      If no EPC rating appears please refer to the legal pack.

      Guide prices and common auction conditions

      •Guide prices given are indications within 10% upwards or downwards of where the reserve price may be set at the time of going to print. Please note they are not an indication of the anticipated sale price or a valuation.

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