Rescuers were hunting through the rubble down any survivors after the three-story structure disintegrated overnight while families were resting inside, the authority said.
"Eleven bodies have been recouped and seven individuals hauled out alive. Another individual is missing," National Calamity Reaction Power official Alok Avasthy told AFP.
The building, which disintegrated around 2:00 am (2030 GMT Monday), was arranged in the Naupada zone of Thane city close Mumbai.
"It was a 50-year-old structure that was in a run down state and had been proclaimed risky by the administration two years back however individuals still lived there," Avasthy said.
"We pulled a group of five to security with the assistance of a sniffer puppy who lets us know that there is still some life in there," he said.
The mischance is the most recent in a long line of destructive building crumples as of late, some of which have highlighted poor development principles.
It comes only a week after nine individuals were executed when another old three-story building caved in under substantial storm rains in the Mumbai suburb of Thakurli.
Millions in India live in broken down structures, a hefty portion of which collapse amid the yearly storm season.
A 11-story loft tower being inherent the southern condition of Tamil Nadu came smashing down in July a year ago after overwhelming precipitation, executing 61 individuals, for the most part workers.
A blasting economy and rising land costs have likewise frequently driven unapproved multi-story structures to mushroom on the edges of urban areas and towns, some of which have broke down.
AFP