The renovations were tax funded, but the house is owned by the royal family. As for security....well, that decision was made years ago when Harry was born. He's too close the RF to not have security so if Brits insist on maintaining the RF then they have to do this. Personally, I think he is opening the door for a more streamlined monarchy. The Queen had distant cousins on the payroll and you've been paying for Andrew's girls for way too long. Things will get done gradually and good on Harry for forcing this on the institution. Charles has been waiting to take ascend so he could do this. Harry got it going.