After telling him the paramedics would be there “as quickly as they can”, an ambulance crew was allocated three minutes after his emergency call, with an estimated journey time from the Redcar station of less than two minutes.
However, the gates locked shut and they were unable to find a manual override to get the ambulance out, the inquest heard.
A different crew eventually got into the house 47 minutes after the first call, but Coates had already died, the coroner heard.
In a statement to the court, his daughter Kellie Coates said the family had not been told about the ambulance delay at the time.
“If the ambulance had got there in the two minutes they should have he would still be here today,” she said.
She said she was “haunted” by the thought of the “desperation” her father would have felt as he awaited the ambulance.