These properties, such as Windsor Castle, the Tower of London, Kensington Palace and Buckingham Palace, cannot be sold because they are property of the state. Charles, as monarch and head of state, is simply a caretaker for his life until they are passed to his descendants.

As of 2026, King Charles III cannot legally sell Buckingham Palace. The palace is not the private property of the monarch; rather, it is part of the Occupied Royal Palaces Estate, held in trust by the monarch for the nation and future generations. While the King personally owns estates like Sandringham and Balmoral—which he could technically sell—Buckingham Palace is managed by the Royal Household and funded through the Sovereign Grant. Although he cannot sell it, the King has significantly changed how it is used. In line with his "modernized monarchy" vision, large sections of the palace have been opened to the public more frequently during his reign, transitioning it from a primary residence to a "working headquarters" and a national monument. Extensive renovations costing approximately £369 million are nearing completion in 2027, ensuring the structure remains a state asset for centuries to come, regardless of whether the King chooses to sleep there.