The roof of a two-storey home has partially collapsed following a fire in Canberra's south on Monday afternoon.
Authorities say both floors of the four-bedroom property were extensively damaged by the blaze.
Several neighbours made triple-zero calls to report the fire at the home on Wittunga Crescent in Banks about 12.20pm.
Firefighters arrived on the scene just after 12.30pm.
The fire was brought under control within an hour and authorities estimate close to $400,000 of damage.
The fire was believed to have started at the rear of the home, however the cause was not known.
ACT Fire and Rescue commander Danny Camilleri said firefighters arrived to find the large four bedroom house well alight.
"We managed to save one side of the house from burning down however there was serious heat and smoke damage to the rest of it," he said.
Commander Camilleri said firefighters adopted a defensive strategy when extinguishing the fire due to the danger of a collapsing roof.
He said nobody was home at the time of the fire although the owners of the property returned in distress to firefirefighters working to save the home.
The fire is not being treated as suspicious and ACT Fire and Rescue will conduct an investigation into the cause of the fire.
The ESA said in a statement at 2.15pm firefighters had extinguished the blaze, and were working to extinguish hot spots.
One neighbour told The Canberra Times he saw smoke rising from the rear of the property, and ran to inspect it.
Another neighbour expressed their sadness for the owners of the property which was extensively damaged.
The intersection of Wittunga Crescent and Olive Pink Cresent was closed by police shortly after 12.30pm, as was Cookson Place.
No neighbouring properties were damaged by the fire.
Commander Camilleri said three fire pumpers were sent to the property, along with the breathing apparatus van and the Bronto Skylift Hydraulic Aerial Platform.