Firefighters were scrambled to the Lillyhall industrial estate near Workington early today.
Crews spent 90 minutes tackling the blaze in a commercial building on the industrial estate.
The fire service was called just before 5am.
Firefighters found a quantity of wood was on fire in a first floor store room.
Crews, two wearing breathing apparatus, used a thermal imaging camera, two hose reel jets and a lighting rig to put out the fire.
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