Cosatu general secretary Zwelinzima Vavi on Thursday said President Jacob Zuma had a duty to clarify who was paying for the renovations to his Nkandla homestead in KwaZulu-Natal, and exactly how much it would cost taxpayers.
There had been much controversy over the issue, with opposition parties saying it went against regulations in the ministerial handbook and that Zuma should not be spending R203-million on his personal residence.
The City Press reported on Sunday that Zuma would only be contributing five percent to the total cost of renovations.
Both the Presidency and the Department of Public Works have refused to comment on the issue, saying details regarding the president's house were protected by the National Key Points Act.
But Vavi said the country needed answers.
"The issue is that there is a huge allegation that taxpayers' money has been abused in a private venture that has nothing to do with State security," said Vavi.
According to the paper, Zuma's revamped homestead would include underground living quarters, a health facility for Zuma and his family, a helicopter pad, houses for the air force and police units, as well as playgrounds and a centre for visitors.