Firefighters were called to a car workshop in Bushey after a fire broke out in the paint oven this morning.
Crews from Watford, Garston and Rickmansworth were called at 11.49 to MD Auto Body shop in Bushey Hall Road.
One jet and two hose reels were used to extinguish the fire, which is being treated as accidental.
An evacuation of the building also took place.
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