Sixty five firefighters rushed to a massive fire at a boat maintenance facility in North Fremantle on Monday afternoon.

A Department of Fire and Emergency Services spokeswoman said the fire started at the Northport Marine Services at the corner of Rous Head Road and Sultan Way just before 2pm.

It is thought a 65 foot boat within the shed caught fire - causing flames to spread quickly Credit:Alex Riddell

She said a number of fire crews headed to the blaze from Fremantle, Perth, Murdoch, Success and Hope Valley.