The eye in the sky gave firefighters an important aerial view of the incident in a car breakers' unit in Siding Road.
Crews had to break into the premises using a petrol-powered saw and used breathing apparatus, two jets and a hose reel to put out the blaze.
In all fire appliances were present for eight hours making sure the site was safe.
It is not thought anyone was injured.
A spokesperson for Lancashire Fire and Rescue Service said: “The fire involved a commercial building.
"Firefighters used six breathing apparatus, two jets, one hose reel, a petrol-powered saw and breaking in equipment to extinguish the fire.”