The three-room concrete structure from 1944 stands above Rue Du Catioroc, on the southern side of Perelle.
The application had proposed opening up part of the bunker and then adding an extension to create a one-bedroom home.
It was only after the application process started that the authority’s conservation and design team surveyed the property, which revealed how rare the bunker was. It was uniquely adapted for both air and coastal defence.
Planners said that the degree of special interest was considered to be high, with outstanding archaeological and historic value. With original fabrics and rarity value said to be of European importance, the bunker was added to the protected monuments list.
Very few individual bunkers have ever been listed, and some that have been are as part of complexes, such as Fort Hommet.
Under the protected building criteria set in 2014, the best examples of Second World War buildings would be considered for protection. That has included a couple at Jerbourg and one near Fort Richmond, all listed in 2023.
The application was rejected as the property was considered to be listed, but planning officers admitted that the protected monument notice was still being prepared and was not ready for publishing.
The planners said it was important to protect the best structures, and would consider listing them when they became aware of development that might harm their interest.
‘WWII structures have for a long time been understood to be an important part of the wider historic environment of Guernsey, and in more recent times there has been public interest in any development, which has the potential to change or harm WWII structures,’ the DPA spokesman said.
Festung Guernsey and the Channel Islands Occupation Society (Guernsey) had both raised concerns about the proposal as part of the planning consultation.
It was considered that the conversion would have a significant and unacceptable impact on the protected monument, and it was not possible to convert it without an extension.
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