Amanda Telfer, 44, died at the scene after 13ft x 13ft frame of a ground-floor window fell on her in west London last week.
An inquest at Westminster Coroner’s Court today heard the frame which struck her had been propped up against a wall.
The BBC reported that the inquest heard that people lifted the frame off Telfer and members of the public and paramedics tried to resuscitate her but she was pronounced dead at the scene 30 minutes later.
Coroner Dr Fiona Wilcox opened and adjourned the inquest as investigations by the Metropolitan Police and Health And Safety Executive continue.
The frame fell from 5 Hanover Square where the ground floor is in being turned into an art gallery with fit-out work being carried-out by Westgreen Construction.
A post-mortem examination gave the cause of death as blunt force trauma.