The fire broke out in an industrial premises along Storeys Bar Road in Fengate at around 2am on Friday.
The fire was believed to have started by a piece of machinery.
Firefighters attended the scene and were able to control the fire and return to their stations by 4am.
“Firefighters arrived to find a fire in an industrial premises involving machinery. They extinguished the fire using a hose reel and returned to their stations by 3.45am.
“The cause of the fire was accidental.”