Unlike former seasons of the series, this season has been pre-recorded and will not air any live episodes, the contestants will nominate and evict each other from the house and Australian viewers will decide the winner in a live finale. This season will also include an eviction every night an episode airs instead of once or twice a week.

In 2020, Seven Network will revamp the format of the series to resemble the format of the American & Canadian editions of Big Brother which early promotional material released in 2019 referred to as Big Brother: Revolution, however, subsequent material released throughout 2020 removed the Revolution tagline.

The new format emphasises the competitive aspect of surviving the eviction process. As such, the Housemates will now be allowed to strategise, politic and collude about the nomination & eviction processes. However, there will still be key differences compared to the American format, as Australia will decide the eventual winner - rather than being decided by a jury formed of evicted housemates.

• Nomination Challenge: At the start of each round, the Housemates compete in a competition. The winner of the competition has the sole power over the Nominations.
• Nominations: Immediately after the challenge, the Nominator will be called to the Diary Room by Big Brother to name 3 nominees and provide full reasons for their Nominations. Big Brother then reveals the Nominations to the house.
• Eviction: On eviction night, all Housemates must vote to evict one of the nominees, with the exception of the Nominator. The eviction vote is by secret ballot, with Housemates casting their votes orally in the Diary Room to Big Brother, and must provide a reason for their vote. In the event of a tied vote, the Nominator will cast a tie-breaking vote publicly. The nominee with the most of the votes is evicted from the house
• Finale: The Final 3 Housemates will face Australia’s Vote to determine the winner.