Teams from five fire stations were called out to a fire in Hipperholme last night.
Crews from Brighouse, Elland, Illingworth, Odsal and Cleckheaton were deployed to the derelict Monoplast plastic factory on Badger Lane just after 6.30pm.
The whole of the building was on fire.
The teams were there until 11.45pm last night.
The cause of the fire is under investigation.