According to the figures from the Interior Ministry's Department of Disaster Prevention and Mitigation, at least three were dead and 19 injured as of 3.30am. Tuesday.
Pathum Thani governor Pongsathorn Sajjachonlaphun asked the military and authorities to supply machinery to remove rubble in searching for survivors.
The collapse of the U-Place condominium building which has been under construction for four months took place at about 4.40pm Monday.
Witnesses said the building collapsed when the workers were pouring concrete on the top floor of the structure. Thirty-three Cambodian and Myanmar workers are among the victims.
Emergency workers said 30 labourers were initially trapped in the wreckage and as of 8pm they were able to rescue 19 of them.
Of the 19 injured workers, 15 were sent to Thanyaburi hospital and two to Khlong Luang hospital.
Fourteen people are believed to still be trapped under the debris.
A seach and rescue operation is still underway. Cries for help were still heard from the debris late Monday.
Rescue workers said two of the dead victims were a mother clutching her baby of seven or eight months old.
Deputy national police chief Pol Gen Aek Angsananon went to observe the rescue operation. He said a team of police and military officers would work with relief workers to help the trapped victims.