This paper describes work in progress evaluating a smart flat for people with dementia that is part of an Extra-Care development in London. The flat has been let to a permanent tenant who has dementia. They are fitted with a KNX (EIB) based integrated smart house system providing local intervention and monitoring in the event of a problem being detected by the built in distributed sensor network. Close cooperation between the system designers, housing manager, social services, evaluation team, users and carers has proved to be important to successful and efficient completion of the design and installation of this technology and its subsequent evaluation. It is expected that much data will be collected using outcome measures and data logging that will facilitate the configuration and evaluation of smart systems for people with dementia.