No one was injured in the incident, they said.
"Fire broke out at around 7 pm at Neeraj thermocol and electrical private ltd. Twenty workers were on duty on the second floor of the building and some of them jumped to safety while others were rescued by fire brigade personnel," said a police official of Ambad police station.
Fire tenders of Nashik Municipal Corporation were rushed to the spot to contain the blaze and it was brought under control after two hours, police said.
The exact cause of fire is being ascertained, said police.