Three fire engines attended to the blaze on the Sandpiper of Hamble 14 foot craft.
Fire crew were called to a blaze at Deganwy marina, North Wales, on Saturday after the Sandpiper of Hamble caught light at about 3:45pm.
The mast of the boat seemed to burn through, as did the craft’s deck and cabin.
An ambulance attended the scene and checked over a person, believed to be the boat’s owner, but they were not injured.
North Wales Fire Service incident commander Arron Spencer said: “When we arrived there was a well-developed fire. We’ve used one hose reel and two main jets. It took 15 to 20 minutes to get the fire under control.
“It was deep-seated so it caused a lot of damage. A specialist water incident unit from Bangor also attended but was not called into use.”