The daily telegraph say that the renovations are being paid from the public purse. The royals are reported to be covering the cost of interior design though. Big deal .... That will be a couple of fleur de lys cushions and some tartan throws!
Can't do a link but its on there.
That's on the Kensington Palace Renovation (part of Crown Estates), It's Almost Certain that Sandringham Estate will fund the renovation of Anmer House on the Sandringham Estate as they (The Queen) will retain ownership of it.
The Queen Mother left an Estate estimated at £70m (at least, though with £7m cash debts) and that was inherited by The Queen free of inheritance tax (The Queen did not pay inheritance tax on her mother's estate, since bequests from a sovereign to a sovereign, or from the consort of a sovereign to a reigning monarch, are exempt) and further bequests to her Great Grandchildren were made from that.
Diana was also a beneficiary of a trust set up by her Father Earl Spencer, the income from which would have also passed to her children.
We will never get to the bottom of Royal finances, they have more Trust funds than the Guinness and Vestey family combined (Google them).
The amounts paid to them from the public purse are dwarfed by their personal expenditure and vast private estates. (Balmoral is 49,000 acres)