The 21st season of the Australian reality TV series The Block began airing on 27 July 2025 via the Nine Network. Returning from the previous installment were hosts Scott Cam and Shelley Craft, alongside site foreman Dan Reilly and judges Shaynna Blaze, Darren Palmer, and Marty Fox.
Production
In July 2024, Nine obtained approval to film once again in Daylesford for the 2025 season, having earlier purchased a 2400-square-metre property at 1 Raglan Street for an undisclosed amount. Casting took place from September through early November 2024, seeking couples aged between 18 and 65 who could commit to a 12-week filming period starting February 2025. While prior renovation experience was advantageous, it was not mandatory. The season's official announcement occurred during Nine’s October 2024 upfronts.
Format changes
This season features the construction of homes from the ground up, all sharing identical designs and dimensions. To increase difficulty, overnight work is prohibited as the site secures every night, requiring teams to optimize their scheduling. For the first time in the series, the opening episode provided contestants with weekly timetables, individual room budgets, an overall budget capped at $250,000, and a $40,000 "powerpass" sponsored by Bunnings.
