Derwent House, on Camden Park Road, Chislehurst, Bromley, is one of a number of the locally renowned 'Willett-built' houses erected on the Camden Park Estate by high-class speculative builder William Willett in the 1900s. Willett bought the entire estate in 1890 with the intention of building on it all but the venture was not successful and he erected only a small number of houses there and on Wilderness Road.