Dhaka fire department spokesman Ataur Rahman told Bangladesh News 24 Hours it took crews more than four hours to put down the fire that began around 3 a.m. on the city's outskirts.
The known dead were six women and five children, eight of whom were found on the ground floor of a 2-story dilapidated building, police said.
At least five people were taken to hospitals with burns and smoke inhalation, the report said.
There were unconfirmed reports the fire started in a garage for rickshaws.
City, district and federal officials said all efforts would be made to help rebuild the burned-out homes, the news website reported.