Fire destroyed the back of a house at 501 Moodus Road, or Route 151. in East Hampton on Thursday morning.
The fire was reported at 7:30 a.m. and it was well-involved when firefighters arrived, officials said.
The homeowner and his dog were not home when fire broke out, and no injuries are reported, but officials said the back of the building was destroyed.
Surrounding towns provided mutual aid and it took 40 minutes to get the fire under control.
The local and state fire marshals are investigating the cause of the fire.