Sixteen families lived in the building built by an expatriate five years ago.
Patiya Municipality Engineer Mizanur Rahman Khandakar blamed flaws in construction for the tilting.
Local authorities have already sealed off the building, Rahman said adding that the owner has been asked to demolish it.
House owner’s brother Jahed said the building’s construction cost Tk 2 crore.
It will be reconstructed following the experts’ suggestions, he said.