The house will be split into two so Prince Harry sticks to isolation rules.
The ceremony and the statue will mark what would have been Princess Diana's 60th birthday. A royal source previously claimed Prince Harry and Prince William will make separate speeches when the new memorial is revealed.
The ceremony to be held at Kensington Palace is the result of a long-term project between the brothers, who originally fell out after Harry made the decision to quit working as a senior royal.
A royal source claimed, "They will both move heaven and earth to be there. They commissioned the statue together. It is very important for them.
"There is, of course, hope the memory of Diana can repair their relationship but that seems a long way off right now.
"The brothers will be physically together for the ceremony but want to make their own personal addresses.
"You might have thought they'd go for a joint statement and speech but that's not the case. Each has insisted on preparing their own."