Built environment research consists of cognitive and affective, as well as behavioural, components. Existing built environment research utilises either strong qualitative or, more often, strong quantitative methodologies. Aims to discuss some of the philosophical issues that would be considered when undertaking academic research into the built environment. Considers the available research options or paradigms and suggests ways in which a researcher can make an informed and sensible decision as to how to proceed. The main dimensions of the debate about the relative characteristics and merits of quantitative and qualitative methodology are outlined, developing the argument that the use of a single methodology often fails to explore all of these components. The use of a mixed methods approach is suggested to counteract this weakness and to enhance research into the built environment.