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Prince William has joined the DIY SOS team to rebuild a boxing gym that was destroyed in the Grenfell Tower fire.
He has been helping to create a new home for the Dale Youth Boxing Academy and a community hub near the site of the blaze in which 71 people died.
The Duke of Cambridge is due to meet residents affected by the fire which broke out on 14 June 2017.
The show's presenter Nick Knowles said the project was one of the DIY SOS's "morally most important" to date.
The gym has turned out stars including WBA super middleweight champion George Groves and Olympic gold medallist James DeGale.
The academy, which was housed at the foot of Grenfell Tower in west London, currently trains at a makeshift facility in a nearby car park.
The programme plans to have parts of the project "built inside a year".
Planning permission for the development was granted on 8 March, conditional on a "full consultation with the community".
This is the second time the prince has appeared on the BBC's flagship construction show, having worked with Prince Harry to help the crew convert homes in Manchester for military veterans in 2015.