Firefighters have been tackling a blaze at the derelict Allen Works site until midnight.
The fire in Badger Lane, Hipperholme, broke out in a single storey building just after 7.30pm yesterday (Wednesday).
Fire crews from Rastrick, Illingworth, Halifax, Cleckheaton and Huddersfield were at the scene after the roof collapsed.
Firefighters were at the site until midnight. No-one was injured.