This session will offer insights into how smart technology can be used in buildings to make them more energy efficient. The focus will be more on domestic but the principles are transferrable to commercial practice. Touching on energy retrofit including the physics and building-fabrics smart building designers can leverage to improve outcomes for occupants and their businesses. Participants will be helped to explore how the transition from AC to DC final circuits can be a huge opportunity for smart building designers. At the end of this session attendees should be more inclined to think of buildings akin to living things with needs and responsibilities.