Firefighters were called to the scene at Rodgers Quay shortly after 11.30pm last night Friday 22 June.
No injuries have been reported in the incident, and the cause of the blaze is not yet known.
East Antrim DUP MLA David Hilditch told the BBC that the fire is "a major blow this morning for Carrickfergus".
"Obviously there will be some major disruption to our activities," said the club's Commodore Roger Woodward in a statement on the club's Facebook page.
"At this early stage the way ahead is not clear, but please be assured that the committee will be totally determined that the club will recover strengthened from this disaster."