The quality and readiness of the health and social care estate is vital for high quality, safe and efficient health and social care. This HBN sets out the design guidance for dementia-friendly health and social care environments. The design principles and the core design features together with a selection of case studies provide guidance for the development of new design solutions and the adaptation/ extension of existing facilities. HBN 08-02 is intended particularly for those who are new to the topic and also for people living with dementia or their advocates who may be engaged as part of stakeholder engagement processes. It may also be helpful for commissioning organisations, auditors and regulators, giving an overall perspective of the dementia-friendly design issues that need to be addressed