Background: An estimated 18 million people in the world have to cope with a decline in intellectual functioning that is not a normal part of the ageing process, called dementia. By 2025, this number is expected to reach 34 million. Alzheimer's disease accounts for 50-70 % of all cases of dementia. In the Netherlands, about two thirds of those affected live at home, with or without a partner. The increasing group of older adults with dementia presents great challenges in terms of creating suitable living environments and appropriate housing. Extramural housing needs further development, as opposed to intramural housing, such as nursery homes. The new extramural housing forms account for and compensate decreasing vitality and overall health status through the use of ICT and other technologies to serve human well-being. This should facilitate both residents and alleviate the intensity of care given by voluntary and professional care givers. In order to create these optimal dwellings at cost effective prices, evidence-based introduction of architectural measures and technological applications is essential. Existing knowledge is best viewed as an effort to expand and stimulate thinking on the relationships between dementia and design; thus, knowledge is largely a collection of hypotheses amenable to, and requiring, implementation and validation.This PhD-project will research some of the design aspects and needs, relevant to the technological home environment for older adults with dementia. This PhD project is shared with Hogeschool Utrecht, Lectureship of Demand Driven Care. Aim of research: Assessing thermal, lighting, and acoustic requirements, feasible home modifications and teleservices to sustain independence and well-being, both being the end product of all services rendered. Results so far indicate that requirements of older adults with dementia differ largely from the requirements of healthy older adults.