Employers are recognising that good health is a total business issue, and a lack of it affects work performance. A number of personal factors, which depend on the physical and mental health of an individual, and a number of external factors, which depend on the physical and social environment besides the work-related systems of management, influence the level of productivity. Fisk has looked at the associations between the transmission of infectious disease, respiratory illnesses, allergies and asthma, sick building syndrome symptoms, thermal environment, lighting and odours. In practice, developers and clients often agree that sustainable healthy buildings are desirable but they want quantified economic evidence to persuade them to finance such projects. As embedded sensory technology develops and its benefits are realised, personalisation is set to remain and the connectivity of building occupants with their surroundings will intensify. Too often buildings are seen as costly static containers rather than as investments, if they are healthy and sustainable, can add value.