Paul Hollywood and Mary Berry's baking reality show has been a phenomenal success on BBC Two, winning record ratings year after year.
"I've championed The Great British Bake Off from the very start and believe the time is absolutely right to bring the show to an even broader audience on BBC One," said BBC One controller Charlotte Moore.
"I've watched the series grow over the last few years and earn a special place in the nation's hearts. It's inspiring and warm storytelling at its best which celebrates the huge talent of enthusiastic and passionate bakers from all over the country. It's been fantastic to watch it flourish on BBC Two, and I can assure viewers I will continue to cherish it on BBC One."
Bake Off, which is made by Love Productions, was launched in 2010. It is hosted by Mel Giedroyc and Sue Perkins.
The show's fourth series has been averaging a consolidated audience of 7 million (27.7% share), and next week's final is expected to top the 7.2 million who tuned in for the series 3 ending last year.
Love Productions CEO Anna Beattie said: "We're extremely proud that the show has captivated so many families and inspired so many people across the country and we aim to do everything we can to ensure its continuing authenticity and integrity.
"We're very grateful to all the support given to us over the last four years by Janice Hadlow and her team at BBC Two."
The Great British Bake Off series semi-final airs tonight (October 15) at 8pm on BBC Two.