A man in his 40s has suffered life-threatening injuries after falling from scaffolding on a house in Chingford Avenue, Chingford Mount.
The fall happened at about 12.10pm on Wednesday 11 November, at a two-storey semi-detached home.
London Ambulance Service sent several teams, including an air ambulance. A spokesperson said: "We sent resources to the scene including an ambulance crew, an advanced paramedic, paramedics in fast response cars, an incident response officer and a clinical team manager."
The man was treated at the scene and then taken by road to a major trauma centre.
The Health and Safety Executive has been told about the incident. It is not yet clear whether the man was a professional scaffolder, and the Metropolitan Police are working to establish how he came to fall.