No one was injured in the fire, which occurred on the second floor of the building, they said.
Fire service personnel rushed to the spot on receipt of information and doused the flames.
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"Among the deceased are three women. The deceased have been identified as Sarika Dasari (45), Nirmala Chabukswar (35), Anuradha Nimbole (17) and one Manoj," police said.
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In another incident, an oil company was gutted in a blaze that broke out in Angaon near Bhiwandi in Thane district.
According to the Chief Fire Officer, around fifty cattle were shifted to safer places from the factory premises.
The cause of fire is being probed.
A spokesman of a cow shelter located adjacent to the factory said around 1000 cows in the facility are safe.
At least four fire engines are still trying to put out the flames.
