Major renovation work is planned for St Tugual's Chapel in Herm, later this year.
It's thought the site date's back to the 6th century, and was rebuilt by Norman monks in the 11th century.
It is listed on the Guernsey States Register of Ancient Monuments and Protected Buildings.
Guernsey's Treasury and Resources department says it has been affected by dampness and repair and consolidation works need to be carried out.
The work will involve re-roofing, re-pointing, re-rendering and the installation of new drainage to the south side of the Chapel.
The renovation is due to start in November.
The department has not revealed how much the project is likely to cost.
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