The Council of Engineers will investigate whether engineers were at fault after an ageing Din Daeng block of flats that city officials claim did not meet standards collapsed on Tuesday afternoon.
The accident at the apartment compound owned by the National Housing Authority (NHA) damaged seven cars and felled nearby trees, but no injuries were reported.
The district office has said it would file a complaint against the NHA, which was responsible for demolition work that led to the 50-year-old building collapsing.
The council said it would call in some of the engineers overseeing the demolition for questioning.
If the work was undertaken without due supervision by engineers, it would be considered an act of negligence and therefore be subject to penalties under the Engineer Act that was enforced in 1999, legal experts said.
Engineers may have been on duty at the work site, but if the demolition was not executed properly, "they would still have been in breach of ethics and may see their professional licences revoked", Council of Engineers secretary-general Amorn Pimanmas said.
The investigation is expected to last about two months, he said.
Workers reportedly used two backhoes to destroy the five-storey building from its base.
However, this contravened the rules. According to Mr Amorn, when a building is knocked down, workers must start from the top floor, not the bottom.
If workers did otherwise, "a flat would fall down sideways, sending debris off barricades [around the building]", he said.
The council is gathering evidence to determine the exact causes that led to the accident.
The demolition was conducted under the NHA's plan to renovate its apartment complex in the district.
Din Daeng officials told the agency to halt the demolition plan in February after they suspected it would be substandard.
Despite this, workers went ahead anyway.
