Sussex Dukes will move to a renovated apartment at Kensington Palace, Frogmore House, where there are at least 10 rooms next to Windsor Castle.
The pair will move from early 2019 to prepare for their first childbirth, scheduled for next spring, explained Kensington Palace.
His new home is where Prince Harry and Meghan celebrate their second wedding reception for families and close friends.
According to the aforementioned source, Windsor is a "special place" in marriage that has been living in Nottingham Cottage since 2017, where Cambridge Dukes also lives with her three children, Princes Jorge and Luis and Princess Carlota.
British media reports recently claimed that the change is due not only to the arrival of the first couple, but also to the controversial contention that there would be a prince William and Harry.
British media Mirror says the move is because they want to better respond to Markka's mom Doria Ragland, who can spend a long time with a couple when a baby is expecting to be born.
The apartment, with the Sussex princes at the Kensington Palace, has only two rooms.
Prince Charles's young son and the American challenge were married to Windsor Castle (outside London) on May 19 and October 15, announcing Meghan's pregnancy.