This is the final report of a three-year project called Building Egressibility in an Ageing Society, sponsored by the Swedish research council for sustainable development (FORMAS). While accessibility is an established and widely used concept in building design, the evacuation of people with functional limitations is still at a stage in which several research gaps exist. In this context, this work discusses the concept of Egressibility, intended as the accessibility to means of evacuation. A categorization of populations with functional limitations in light of their egress-related abilities was performed by reviewing egress and accessibility research. The role of functional limitations on evacuation performance was investigated using the International Classification of Functioning, Disability and Health (ICF). A qualitative interview study consisting of 28 semi-structured interviews with people with functional limitations was conducted to further scrutinize Egressibility issues of older people. An Egressibility assessment instrument, the Egress Enabler, has been developed based on the concept of person-environment fit. A Virtual Reality (VR) experiment involving 40 participants was also conducted to demonstrate the use of VR technology to study the impact of people with functional limitations on egress. It also allowed to explore how the presence of people with functional limitations affects exit choice. Overall, Egressibility was investigated with the aim to ensure that egress planning and procedures are designed to equally consider all members of an aging society.