Construction workers were observed on Tuesday erecting a security fence at Marsh Farm on the Sandringham Estate, where Andrew Mountbatten-Windsor is due to take up residence around April.
The property is currently undergoing renovation work ahead of the former Duke of York's planned move.
Mr Mountbatten-Windsor remains at nearby Wood Farm, where Norfolk Police detained him last Thursday on suspicion of misconduct in public office.
The former prince has kept out of public view since returning to Sandringham after being released from police custody six days ago.
Workmen return to Andrew Mountbatten-Windsor's future home
|PA
His security personnel were seen driving through the neighbouring village of Wolferton on Tuesday morning.
Norfolk Police took Andrew into custody at Wood Farm on Thursday morning, questioning him over alleged misconduct during his decade-long stint as Britain's trade envoy between 2001 and 2011.
Mr Mountbatten-Windsor has consistently denied any wrongdoing.
Workers pictured at Marsh Farm today
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Australian Prime Minister Anthony Albanese has written to Sir Keir Starmer confirming his Government would support any move to exclude Andrew from the royal succession.
"In light of recent events concerning Andrew Mountbatten-Windsor, I am writing to confirm that my government would agree to any proposal to remove him from the line of royal succession," Mr Albanese wrote, adding that Australians "take these grave allegations seriously."
Downing Street confirmed receipt of the letter, with the Prime Minister's spokesman stating the Government was "considering whether further steps are required" and "not ruling anything out."
Marsh Farm will be Andrew's future home after renovations complete
|PA
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Workmen first arrived on Tuesday, February 24
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New Zealand followed suit, with a spokesman for New Zealand Prime Minister Christopher Luxon saying Wellington would back the British Government if it decided to take action.
King Charles responded to his brother's arrest by stating: "The law must take its course."
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