Housing affordability is a multi-dimensional issue, yet it is typically defined and assessed quite narrowly in terms of financial criteria. The housing affordability problem encompasses more than the financial costs of housing and extends to larger issues of social wellbeing and sustainability. Accordingly, a broader range of factors ought to be considered when defining and assessing affordability, particularly if more sustainable outcomes are desired from the housing. A comprehensive system of criteria representing sustainable housing affordability, developed by the authors, is validated and analyzed in this paper. The quantitative data analysis of surveys conducted with housing and planning professionals across the UK is used to determine stakeholders’ perceptions on the criteria contributing to sustainable housing affordability and to rank these criteria according to their importance.