Firefighters were called to a blaze at a boat yard in Brightlingsea.
Essex Fire and Rescue was called to a single-storey building in Tower Street at 3.50pm.
Crews from Brightlingsea, Colchester and Clacton are currently fighting the blaze.
The building, which is 10 metres by 15 metres, is 60 per cent alight.
UPDATE
The fire was extinguished by 4.21pm.
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