This article shows how model dwellings companies were able to offer a solut
ion to the 'housing problem' by profitably providing decent working-class a
ccommodation in nineteenth-century London. Despite their success, a conjunc
ture of economic circumstances, ideological change, and public crowding-out
led to the marginalization of model dwellings companies. This experiment t
o provide a market solution to a social problem represents a nineteenth-cen
tury form of ethical investment which has not been accommodated within the
historiography of the development of the welfare state.