The meeting hall was in deplorable condition, so the Chamber decided on a major renovation. The architect Jules de Joly (1788–1865) who had been official architect of the Chamber since 1821, was selected for the task. The architect proposed four possible new shapes for the hall; an ellipse, rectangle, octagon and hemicycle, but the Chamber decided to keep the original hemicycle. De Joly also was asked to redesign the three salons which faced on the courtyard of honor. The plan was submitted in January 1828, approved in April 1829, the first stone placed on 4 November 1829. Over three hundred workers were engaged on the project, one of the largest undertaken in Paris during the Restoration. Work continued, despite the Revolution of 1830 that brought down the Bourbon Monarchy, and replaced it with a new Constitutional Monarchy. Louis Philippe, the new King, came to take the oath to the Chamber in its temporary meeting place. A second project, that of constructing a library, was commenced April 1831. The new interior was completed in September 1832, and formally inaugurated by the new monarch on 19 November 1832.