A pilot has suffered non-life threatening injuries when his helicopter crashed through the roof of a Melbourne home.

The crash happened at Mentone in the city’s south-east on Wednesday at about 1pm.

The man sustained injuries to his lower body and was taken to The Alfred hospital for further assessment.

He was trapped for about an hour before emergency services used a crane to free him from the wreckage.

No one was in the home at the time of the crash.

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Surrounding roads remained closed later in the afternoon. Authorities were treating the area as a crime scene until it could be made safe.

Victorian Police Senior Sergeant Andrew Wise said it was too early to determine what caused the accident.

“It’s very early stages in the investigation,” Senior Sergeant Wise said at the scene on Wednesday.

“All we know is that there was a single occupant in the helicopter and we’re unsure of the cause of the accident at the stage.”

It was later reported the pilot was on a training flight.

Authorities will assess the integrity of the home before residents are allowed to return.

The Air Traffic Safety Bureau has taken over the investigation with assistance from Victoria Police.

-with AAP