Proposals to add another strongroom, were put forward towards the end of last year, when it was estimated that the facility was due to reach its capacity by mid-2019.
Under the plans, which are expected to cost about £3.5 million, a three-storey extension will be built at the Clarence Road site, which became the home of the Island’s official archive in 2000.
Funding for the project was included in the States Medium-Term Financial Plan, which was approved by politicians in September.
It is estimated that the extra strongroom, which will maintain the ideal environmental conditions needed for long-term document storage, will provide another 25 years worth of space at the current deposit rate.
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