One of the most baffling aspects to the study of Versailles is the cost – how much Louis XIV and his successors spent on Versailles. Owing to the nature of the construction of Versailles and the evolution of the role of the palace, construction costs were essentially a private matter. Initially, Versailles was planned to be an occasional residence for Louis XIV and was referred to as the "king's house". Accordingly, much of the early funding for construction came from the king's own purse, funded by revenues received from his appanage as well as revenues from the province of New France (Canada), which, while part of France, was a private possession of the king and therefore exempt from the control of the Parliaments.
Costs of restoration programs - The ravages of war and neglect over the centuries have left their mark on the palace and its park. Modern French governments of the post-World War II era have sought to repair these damages. They have on the whole been successful, but some of the more costly items, such as the vast array of fountains, have yet to be put back completely in service. As spectacular as they might seem now, they were even more extensive in the 18th century.The restoration initiatives launched by the Fifth Republic have proven to be perhaps more costly than the expenditures of the palace in the Ancien Régime. Starting in the 1950s, when the museum of Versailles was under the directorship of Gérald van der Kemp, the objective was to restore the palace to its state – or as close to it as possible – in 1789 when the royal family left the palace. Among the early projects was the repair of the roof over the Hall of Mirrors; the publicity campaign brought international attention to the plight of post-war Versailles and garnered much foreign money including a grant from the Rockefeller Foundation.
The French revived 18th-century weaving techniques so as to reproduce the silks used in the decoration of Versailles. The two greatest achievements of this initiative are seen today in wall hangings used in the restoration of the chambre de la reine in the grand appartement de reine and the chambre du roi in the appartement du roi. While the design used for the chambre du roi was, in fact, from a design that had been used during the Ancien Régime to decorate the chambre de la reine, it nevertheless represents a great achievement in the ongoing restoration at Versailles. Additionally, this project, which took over seven years to achieve, required several hundred kilograms of silver and gold to complete.
Estimates of the amount spent to build Versailles are speculative. An estimate in 2000 placed the amount spent on Versailles during the Ancien Régime as $2 billion. This figure in all probability is an under-evaluation of the money spent on Versailles. France's Fifth Republic expenditures alone that have been directed to restoration and maintenance at Versailles undoubtedly surpass those of the Sun King.