Newcastle City Council may take legal action after glass panels fell from the roof of the Haymarket Bus Station, injuring a passer-by.
The bus station is closed while an investigation is carried out
Despite most of the glass being caught by safety netting, some hit the woman's shoulder on Monday.
The council said it is gathering evidence to find out which, if any, of the companies involved in the station's construction, is responsible.
The city centre station remains closed while the investigation is carried out.
A council spokeswoman said: "We're gathering evidence with a view to prepare a case. At this stage it is important to find out what the problem is.
"There were a number of builders involved and, at the moment, it is not possible to establish what exactly caused the glass to break."
The station's safety netting, designed to catch falling glass, was installed following a series of similar incidents in recent years.
Closing the station has affected many bus services, but public transport operator Nexus said they were trying to minimise the disruption.
Nexus spokesman Huw Lewis said: "All the buses travelling to Haymarket are still making their journeys and they will be calling at stops within 100m of the bus station.
"We have extra staff around the station to help anyone who needs directing to the correct stop."