Those living in the area have been advised to keep their windows and doors closed as a precaution.
Fifteen fire engines have been attending a large scale fire at Moulds Patterns and Models on Kent Road in Pudsey overnight.
West Yorkshire Fire and Rescue Service received a call to the premises at 10pm last night.
On arrival the single storey building, measuring around 60 metres by 40 metres, was well alight. There was no-one inside and no-one has been hurt. At the height of the incident there was 70 firefighters and officers on the scene.
A number of houses nearby were evacuated as a precaution however all residents are now back in their homes.
Incident Commander Ronnie Goldwater said: “Crews have done very well to prevent the fire from spreading, especially given that they were working in freezing temperatures through the night.
“The fire is now out but it is still smoldering and there are pockets of hotspots which crews are damping down.
“Firefighters tackled the fire from outside the building as it was unsafe to enter and the roof has now collapsed in.
“The Fire Service will be working alongside a structural engineer today to ascertain the future of the building and it is likely that crews will remain on scene for at least the next 24-hour to 48 hours.
“Whilst the roads are now open again we urge people to avoid the area to help the Fire Service deal with this incident.”
A Fire Investigation Officer will also be attending the scene today.