The Duke and Duchess of Sussex's new home renovations have cost £2.4 million in public funds so far.
The royal couple - who have seven-week-old son Archie together - have paid for upgraded fixtures and fittings at Frogmore Cottage in Windsor, but the Sovereign Grant has covered the cost of replacing heating, electric, gas and water main systems, as well as replacing ceiling beams and floor joists at the property, which has been remodelled from five separate living quarters into one residence.
Prince Harry and Duchess Meghan were alo permitted to use the grant to install a "certain standard" of kitchen, bathroom, flooring and fitted furniture from the grant, but anything considered a "higher spec" than that approved by the palace must be met by the couple themselves.
Sir Michael Stevens, Keeper of the Privy Purse, who is responsible for monarchy's accounts, said of Frogmore Cottage: "The property had not been the subject of work for some years and had already been earmarked for renovation in line with our responsibility to maintain the condition of the occupied royal palaces estate.
"The Sovereign Grant covered the work undertaken to turn the building into the official residence and home of the Duke and Duchess of Sussex and their new family.