He bought Belmont House near Faversham in 1801. In 1815 he was made a peer of the United Kingdom under the title Baron Harris, of Seringapatam and Mysore and of Belmont in the County of Kent. In 1820 he was appointed GCB, and in 1824 was made governor of Dumbarton Castle. He was colonel of the 73rd (Highland) Regiment of Foot from 1800 to his death. Lord Harris died at Belmont in May 1829. His descendant, the 4th Baron Harris (b. 1851), best known as a cricketer, was Under-Secretary for India (1885–1886), Under-Secretary for war (1886–1889) and Governor of Bombay (1890–1895).