Branson said the blaze was caused by a lightning strike on The Great House on Necker Island, and that the building was completely destroyed.
Branson, his wife Joan and son Sam were staying in a nearby property, but among those who fled the affected building were 35-year-old Winslet, her boyfriend and family, Branson's mother Eve and his daughter Holly.
"Around 20 people were in the house and they all managed to get out and they are all fine," Branson said in comments released to the British media.
"We had a really bad tropical storm with winds up to 90 miles per hour. A big lightning storm came around 4 a.m. and hit the house.
"My son Sam rushed to the house and helped get everyone out. Kate Winslet, her boyfriend and her family were there and Holly and some of her friends were also staying. My mother was there and they managed to get her out and she is fine."
He said his office was based in the main house, and that he had lost thousands of photographs in the fire.
Branson added that he planned to rebuild the property, which British media said had been expected to be the venue for the marriage later this year of Holly to fiance Fred Andrews.
Necker Island is part of the British Virgin Islands and is privately owned by Branson.
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Winslet won an Academy Award for Best Actress for her performance in The Reader, released in 2008. She won two Golden Globe Awards in the same year also. Best Actress in Drama for Revolutionary Road and Best Supporting Actress for The Reader. She has won two BAFTA Awards too, Best Actress for The Reader, and Best Supporting Actress for Sense and Sensibility, released in 1995. She has been nominated for Academy Award six times in her career yet, seven Golden Globe nominations , and seven BAFTA nomination, she has earned. She has received numerous awards from other organizations, including the Los Angeles Film Critics Association Award for Best Supporting Actress for Iris, released in 2001 and the Screen Actors Guild Award for Outstanding Performance by a Female Actor in a Supporting Role for Sense and Sensibility and The Reader, both. Premiere magazine named her portrayal of Clementine Kruczynski in Eternal Sunshine of the Spotless Mind in 2004 as the 81st greatest film performance of all time. It is recorded good achievement.
