The senior national officer, Captain Andrew Blackburn, says the buildings are being refurbished to address potential electrical hazards and ensure they can better withstand cyclones.
Around 40 NZDF engineers, plumbers, carpenters and electricians are working alongside 20 military engineers from China, the United Kingdom and the United States to build a new fuel depot.
The depot will support maritime patrols working to combat illegal fishing in the northern Cooks.
