Cake House has been upgraded to incorporate Passive House Enerphit principles, including high insulation, no thermal bridges, low air infiltration, high-performance glazing, and a heat recovery ventilation system. However, ultimately, it has been designed to operate as a passive mixed-mode beach shack, destined to be robust against its extreme context and an intensifying climate. It operates as 100% electric and Net Zero energy use (-7,000 kWh/yr back to the grid) with an onsite PV system.