The Mail reports that Kate – who is due to have her baby next week – will benefit from a discount for returning mothers after she had Prince George in the same hospital two years ago.
A suite of two rooms costs £6,570 for a one-night stay with normal delivery – £5,913 with Kate's discount – plus consultant fees of about £6,000 on top.
That means the cost of even a natural delivery, with little in the way of complications, will easily top £12,000 - with added costs if the use of forceps or other equipment is required.
When she had Prince George, the Duchess stayed just one night in the hospital, but if she wishes to stay longer it will cost her an extra £2,300.
The Duchess has said the Royal baby is due 'mid to late April', meaning that he or she could arrive on the Cambridge's wedding anniversary – April 29 – or the 89th birthday of its great-grandmother, the Queen, on April 21.
In preparation for the birth, parking restriction notices have now been put up outside the hospital. Written on them are the words: "Special event."
The yellow signs come into force tomorrow and run until April 30 - meaning Kensington Palace clearly anticipate the Duchess to have given birth by then, although George was himself a little late.
The Duke and Duchess want to ensure there are no pictures of the Duchess heading in to the hospital in labour and are hoping for less of a media circus this time after photographers and journalists spent weeks camped outside the hospital on what was dubbed the 'Great Kate Wait'.Kate will be looked after by a team of experts led by Guy Thorpe-Beeston, who is surgeon-gynaecologist to the household.
The Lindo Wing's rooms are all equipped with satellite television, wi-fi radio, a safe and a fridge. There is also a bedside phone, internet access and the option of having a daily newspaper delivered to your room.
It even has its own team of catering staff separate from the rest of the hospital ready to cater for any dietary whim.
The hospital wing also offers its own wine list should patients and their guests wish to enjoy a glass of champagne to celebrate their baby's arrival and fully-reclining chairs - for partners to have a nap.