Large-scale literature reviews (Ambrose et al., 1996) and specific studies appear to have confirmed that poor housing and poor health have a close relationship and that improving housing conditions has a positive effect (Green, 1997; Collins, 1999; Wilkinson, 1999). However, establishing a causal link remains challenging, in part because of the large number of variables to account for. It may also be the case that the health-led nature of previous research has not fully appreciated the complexities of some of the housing inputs.