With capital accumulated from his two marriages and his inheritance from his father, Boulton sought a larger site to expand his business. In 1761 he leased at Soho, then just in Staffordshire, with a residence, Soho House, and a rolling mill. Soho House was at first occupied by Boulton relatives, and then by his first partner, John Fothergill. In 1766 Boulton required Fothergill to vacate Soho House, and lived there himself with his family. Both husband and wife died there, Anne Boulton of an apparent stroke in 1783 and her husband after a long illness in 1809.