Bronson, who was staying at a nearby house said
the fire "completely destroyed" the building.
"Around 20 people were in the house and they all managed to get out and they are all fine," he added.
Winslet, who was with her daughter Mia and son her son Joe, helped Branson's 90-year-old mother Eve to safety. Branson's mother and her 29-year-old daughter, Holly were staying in the house when the fire broke out early Monday.
"We had a really bad tropical storm with winds up to 90mph [145km/h]," said Sir Richard, who was staying at a nearby property with his wife Joan and son Sam, 25, at the time.
Everyone in the house escaped without injury, said Sir Richard "A big lightning storm came around 04:00 and hit the house.
"My son Sam and nephew Jack rushed to the house and helped get everyone out, and many thanks to Kate Winslet for helping to carry my 90-year-old mum out of the main house to safety.
Branson was very appreciative of Winslet rescue of her mother. He likened the actress to a scene from one of her Hollywood blockbusters.
: "Many thanks to Kate Winslet. It was she who carried my mother out of the house. She swept her up into her arms and got them out of the house as fast as possible.
"My mum is 90 and can walk but it was more to speed the process up than anything else. But Kate was great."
The Virgin Group owner said he wants to rebuild the house
as soon as possible.
‘We’ll all stay here for the time being. There’s a lot of damage and we won’t be able to stick it back together again right away. It was a beautiful house.
‘We will rebuild the house as soon as we can. We’ll all stay here. There’s a lot of damage but we’ll create something even more special out of the ruins.’
In 1979, the British tycoon bought the island for 180,000 pounds from Lord Cobham. It took him thee years and spent US10 million to turn the 74-acre property into a private island retreat.
The island resort is very popular place for the rich and famous
. The late Princess Diana used to visit the island with her young sons Harry and William back in 1990's
Other famous figures who have stayed at the resort include Janet Jackson, Harrison Ford, Mariah Carey, Eddie Murphy and Oprah Winfrey.