When the Prince became King George Ⅲ, Chambers was naturally employed as his architect. His designs include the palace of Somerset House and important architecture in the Royal Botanical Gardens at Kew. It is due to the fame of Kew that he was knighted by the King of Sweden in 1771. The following year he published his controversial Dissertation on Oriental Gardening.
未幾王子即位成喬治三世，錢柏斯又順利成為御用建築師，設計過英國許多知名的重要建築，尤以皇家丘園博得盛名，並因此受瑞典國王封為勳爵，隔年又出版《東方園林論》。