Care home residents spend between 65-72% of their day in the living area of the care home (Barnes 2006). Despite this, there is a lack of research examining how the design of these areas can influence the behaviour of residents, especially those with dementia. The importance of the design of care home environments for people with dementia has been realised over the past three decades and a significant amount of research has been carried out in this field, however research examining the design of living areas within dementia care homes has been neglected. Lawton (1979) suggests that making small changes to the environment of a dementia sufferer can have disproportionate, positive effects on their independence and well being. This study aims to assess the behaviour of dementia residents before and after the redesign of six different living areas across three dementia care homes. The modifications in each living area are based on the principles of creating a choice of space using furniture arrangement (Calkins, 2001) and incorporating “edge spaces” into the design to provide a visual connection to nature (Chalfont, 2007). However, the exact changes that were made in each of these spaces was influenced by what the existing physical environment allowed. The study employed a pre/post modification design with data collection periods lasting 3 weeks at both points. The main data collection method was behaviour mapping, to record the overall usage of the space and behaviours of the care home residents. The main behaviour categories observed were agitation, active behaviour, passive behaviour and social interactions. Data was also collected from staff and relatives of the residents in the form of focus groups and questionnaires, to ascertain their perceptions of the existing environment and also their perceptions of the changes made to the living areas and its effects on the residents. The results indicate a number of positive changes in behaviour following the redesign. These include a decrease in agitation, an increase in positive social interaction between residents and an increase in contented behaviours. The results will be discussed in relation to current research and theories of environmental design and dementia. Similarities and differences across the six living spaces will also be highlighted and explained, drawing on data collected about the existing physical environment and the treatment philosophy of each care home. Overall this research provides important empirical findings that can reliably inform the future design of care homes for people with dementia.