A multi-million dollar house has been destroyed by fire in Sydney’s north last night.

The home on Futuna Street at Hunters Hill went up in flames after an explosion at about 7.30pm.

Firefighters rushed to the scene and eventually managed to extinguish the blaze but the mansion has sustained significant structural damage.

House fire in #huntershill pic.twitter.com/vRIJfWNb5v

— Alexander Porter (@alexjamesporter) September 4, 2019

Four neighbouring properties had to be evacuated as a precaution but no one has been injured.

It’s believed the residents of the home are away on holidays at the moment.

Neighbours have reported a strong smell of gas before the explosion.

Fire investigators will enter the property as soon as it’s deemed safe and look to determine the cause.

Authorities are working to determine the cause of a blaze that tore through a multimillion-dollar mansion in Sydney’s Hunters Hill overnight. #9Today pic.twitter.com/O03JBmchFI

— The Today Show (@TheTodayShow) September 4, 2019

Image: Twitter/Alexander Porter