"It literally burned to the ground," said Cash's brother, Tommy, of the house which is now owned by singer Barry Gibb. "I watched it burn to the ground. I couldn't believe that it was happening. It was just horrible."
On Tuesday, dispatchers for the local fire department said that all but one of the city's fire trucks had responded to the blaze in the suburb northeast of Nashville, the Associated Press reports.
The home where Cash and his wife, singer June Carter Cash, lived at until their deaths in 2003, was purchased by Gibb last year. Gibb is a member of the Bee Gees.
"We are both saddened and devastated by the news," Gibb and his wife, Linda, told PEOPLE in a statement through his rep.
The couple had said they planned to restore the home, which is located on Old Hickory Lake, and hoped to write songs there.
No injuries were reported.
According to the Hendersonville Fire Department, construction crews were working on the house when the fire started, but the direct cause is unknown.
Reporting by EILEEN FINAN
the tennessean / AP