The Conservatory was part of a wing added to Carlton House in 1807, which lay to the west end of the south front. It was made of cast iron, then an innovative material; however, the design was revivalist, based on the Perpendicular style of architecture. In 1811, the Prince held a dinner to celebrate the Regency, for which the 200ft-long table ran through both the Dining Room and the Conservatory.

Acquired by George IV