The exercise is part of a scheduled inspection programme which is undertaken at all Council-owned buildings.
Local residents are asked to be aware that there is likely to be some disruption to traffic on the day of the survey – Tuesday, August 20.
Councillor Jim Montgomerie, Cabinet Member for Place, said: "We regularly monitor and inspect all of our buildings, including our historic landmarks like Seagate Castle.
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"We have already carried out a routine inspection of the castle from the ground and will now be carrying out a detailed survey at high level to further investigate and record its condition.
"This will allow us to establish any future programme of repairs which may or may not be required.
"Seagate Castle is one of our most historic buildings on one of our oldest streets, dating back to Irvine's earliest days, and we take our jobs as custodians of this important heritage building very seriously."
While the inspection is undertaken, works will be carried out to remove vegetation growth. This is a precautionary measure to help preserve and protect the condition and appearance of the castle.
North Ayrshire Council has liaised with Historic Environment Scotland and appointed Conservation Architects to ensure an appropriate and thorough approach to the survey.
It is expected that a traffic management system will be required on the day of the investigation, therefore local residents and motorists likely to use Seagate are advised to expects some delays.
(MH/JG)
